Yapf code style

.style.yapf

@@ -0,0 +1,198 @@
+[style]
+based_on_style = pep8
+
+#  █████  ██      ██
+# ██   ██ ██      ██
+# ███████ ██      ██
+# ██   ██ ██      ██
+# ██   ██ ███████ ███████
+
+
+# Align closing bracket with visual indentation.
+# align_closing_bracket_with_visual_indent=True
+
+# Allow dictionary keys to exist on multiple lines. For example:
+#
+#   x = {
+#       ('this is the first element of a tuple',
+#        'this is the second element of a tuple'):
+#            value,
+#   }
+# allow_multiline_dictionary_keys=False
+
+# Allow lambdas to be formatted on more than one line.
+# allow_multiline_lambdas=False
+
+# Insert a blank line before a class-level docstring.
+# blank_line_before_class_docstring=False
+
+# Insert a blank line before a 'def' or 'class' immediately nested
+# within another 'def' or 'class'. For example:
+#
+#   class Foo:
+#                      # <------ this blank line
+#     def method():
+#       ...
+# blank_line_before_nested_class_or_def=False
+
+# Do not split consecutive brackets. Only relevant when
+# dedent_closing_brackets is set. For example:
+#
+#    call_func_that_takes_a_dict(
+#        {
+#            'key1': 'value1',
+#            'key2': 'value2',
+#        }
+#    )
+#
+# would reformat to:
+#
+#    call_func_that_takes_a_dict({
+#        'key1': 'value1',
+#        'key2': 'value2',
+#    })
+coalesce_brackets=True
+
+# The column limit.
+# column_limit=79
+
+# Indent width used for line continuations.
+# continuation_indent_width=4
+
+# Put closing brackets on a separate line, dedented, if the bracketed
+# expression can't fit in a single line. Applies to all kinds of brackets,
+# including function definitions and calls. For example:
+#
+#   config = {
+#       'key1': 'value1',
+#       'key2': 'value2',
+#   }        # <--- this bracket is dedented and on a separate line
+#
+#   time_series = self.remote_client.query_entity_counters(
+#       entity='dev3246.region1',
+#       key='dns.query_latency_tcp',
+#       transform=Transformation.AVERAGE(window=timedelta(seconds=60)),
+#       start_ts=now()-timedelta(days=3),
+#       end_ts=now(),
+#   )        # <--- this bracket is dedented and on a separate line
+dedent_closing_brackets=True
+
+# Place each dictionary entry onto its own line.
+# each_dict_entry_on_separate_line=True
+
+# The regex for an i18n comment. The presence of this comment stops
+# reformatting of that line, because the comments are required to be
+# next to the string they translate.
+# i18n_comment=
+
+# The i18n function call names. The presence of this function stops
+# reformattting on that line, because the string it has cannot be moved
+# away from the i18n comment.
+# i18n_function_call=
+
+# Indent the dictionary value if it cannot fit on the same line as the
+# dictionary key. For example:
+#
+#   config = {
+#       'key1':
+#           'value1',
+#       'key2': value1 +
+#               value2,
+#   }
+indent_dictionary_value=True
+
+# The number of columns to use for indentation.
+# indent_width=4
+
+# Join short lines into one line. E.g., single line 'if' statements.
+join_multiple_lines=False
+
+# Do not include spaces around selected binary operators. For example:
+#
+#   1 + 2 * 3 - 4 / 5
+#
+# will be formatted as follows when configured with a value "*,/":
+#
+#   1 + 2*3 - 4/5
+#
+# no_spaces_around_selected_binary_operators=set()
+
+# Use spaces around default or named assigns.
+# spaces_around_default_or_named_assign=False
+
+# Use spaces around the power operator.
+# spaces_around_power_operator=False
+
+# The number of spaces required before a trailing comment.
+# spaces_before_comment=2
+
+# Insert a space between the ending comma and closing bracket of a list,
+# etc.
+# space_between_ending_comma_and_closing_bracket=True
+
+# Split before arguments if the argument list is terminated by a
+# comma.
+# split_arguments_when_comma_terminated=False
+
+# Set to True to prefer splitting before '&', '|' or '^' rather than
+# after.
+# split_before_bitwise_operator=True
+
+# Split before a dictionary or set generator (comp_for). For example, note
+# the split before the 'for':
+#
+#   foo = {
+#       variable: 'Hello world, have a nice day!'
+#       for variable in bar if variable != 42
+#   }
+# split_before_dict_set_generator=True
+
+# If an argument / parameter list is going to be split, then split before
+# the first argument.
+split_before_first_argument=True
+
+# Set to True to prefer splitting before 'and' or 'or' rather than
+# after.
+# split_before_logical_operator=True
+
+# Split named assignments onto individual lines.
+# split_before_named_assigns=True
+
+# The penalty for splitting right after the opening bracket.
+# split_penalty_after_opening_bracket=30
+
+# The penalty for splitting the line after a unary operator.
+# split_penalty_after_unary_operator=10000
+
+# The penalty for splitting right before an if expression.
+# split_penalty_before_if_expr=0
+
+# The penalty of splitting the line around the '&', '|', and '^'
+# operators.
+# split_penalty_bitwise_operator=300
+
+# The penalty for characters over the column limit.
+# split_penalty_excess_character=4500
+
+# The penalty incurred by adding a line split to the unwrapped line. The
+# more line splits added the higher the penalty.
+# split_penalty_for_added_line_split=30
+
+# The penalty of splitting a list of "import as" names. For example:
+#
+#   from a_very_long_or_indented_module_name_yada_yad import (long_argument_1,
+#                                                             long_argument_2,
+#                                                             long_argument_3)
+#
+# would reformat to something like:
+#
+#   from a_very_long_or_indented_module_name_yada_yad import (
+#       long_argument_1, long_argument_2, long_argument_3)
+# split_penalty_import_names=0
+
+# The penalty of splitting the line around the 'and' and 'or'
+# operators.
+# split_penalty_logical_operator=300
+
+# Use the Tab character for indentation.
+# use_tabs=False

demo/cabaret.py

@@ -39,7 +39,6 @@ try:
 except:
     pass
 
-
 try:
     import wsreload
 except ImportError:
@@ -49,6 +48,7 @@ else:
 
     def log(httpserver):
         app.logger.debug('WSReloaded after server restart')
+
     wsreload.monkey_patch_http_server({'url': url}, callback=log)
     app.logger.debug('HTTPServer monkey patched for url %s' % url)
 

demo/cabaret/__init__.py

@@ -34,10 +34,14 @@ def create_app():
     @app.route("/")
     def index():
         return render_template(
-            'index.jinja2', charts_names=CHARTS_NAMES, configs=CONFIG_ITEMS,
-            interpolations=INTERPOLATIONS, styles_names=styles.keys())
+            'index.jinja2',
+            charts_names=CHARTS_NAMES,
+            configs=CONFIG_ITEMS,
+            interpolations=INTERPOLATIONS,
+            styles_names=styles.keys()
+        )
 
-    @app.route("/svg", methods=('POST',))
+    @app.route("/svg", methods=('POST', ))
     def svg():
         values = request.values
         config = loads(values['opts'])

demo/moulinrouge/__init__.py

@@ -23,8 +23,8 @@ from pygal.util import cut
 from pygal.etree import etree
 from pygal.style import styles, parametric_styles
 from base64 import (
-    urlsafe_b64encode as b64encode,
-    urlsafe_b64decode as b64decode)
+    urlsafe_b64encode as b64encode, urlsafe_b64decode as b64decode
+)
 import string
 import random
 import pickle
@@ -39,9 +39,9 @@ def get(type):
 
 def random_label():
     chars = string.ascii_letters + string.digits + u' àéèçêâäëï'
-    return ''.join(
-        [random.choice(chars)
-         for i in range(random.randrange(4, 30))])
+    return ''.join([
+        random.choice(chars) for i in range(random.randrange(4, 30))
+    ])
 
 
 def random_value(min=0, max=15):
@@ -61,8 +61,8 @@ def create_app():
             etree.to_lxml()
 
     def _random(data, order):
-        max = 10 ** order
-        min = 10 ** random.randrange(0, order)
+        max = 10**order
+        min = 10**random.randrange(0, order)
 
         series = []
         for i in range(random.randrange(1, 10)):
@@ -74,8 +74,8 @@ def create_app():
         return series
 
     def _random_series(type, data, order):
-        max = 10 ** order
-        min = 10 ** random.randrange(0, order)
+        max = 10**order
+        min = 10**random.randrange(0, order)
         with_secondary = bool(random.randint(0, 1))
         series = []
         for i in range(random.randrange(1, 10)):
@@ -84,11 +84,13 @@ def create_app():
             elif type == 'XY':
                 values = [(
                     random_value((-max, min)[random.randrange(0, 2)], max),
-                    random_value((-max, min)[random.randrange(0, 2)], max))
-                    for i in range(data)]
+                    random_value((-max, min)[random.randrange(0, 2)], max)
+                ) for i in range(data)]
             else:
-                values = [random_value((-max, min)[random.randrange(1, 2)],
-                                       max) for i in range(data)]
+                values = [
+                    random_value((-max, min)[random.randrange(1, 2)], max)
+                    for i in range(data)
+                ]
             config = {
                 'secondary': with_secondary and bool(random.randint(0, 1))
             }
@@ -101,25 +103,29 @@ def create_app():
     @app.route("/")
     def index():
         return render_template(
-            'index.jinja2', styles=styles, parametric_styles=parametric_styles,
+            'index.jinja2',
+            styles=styles,
+            parametric_styles=parametric_styles,
             parametric_colors=(
-                '#ff5995', '#b6e354', '#feed6c', '#8cedff', '#9e6ffe'),
-            links=links, charts_name=pygal.CHARTS_NAMES)
+                '#ff5995', '#b6e354', '#feed6c', '#8cedff', '#9e6ffe'
+            ),
+            links=links,
+            charts_name=pygal.CHARTS_NAMES
+        )
 
     @app.route("/svg/<type>/<series>/<config>")
     def svg(type, series, config):
-        graph = get(type)(
-            pickle.loads(b64decode(str(config))))
-        for title, values, serie_config in pickle.loads(
-                b64decode(str(series))):
+        graph = get(type)(pickle.loads(b64decode(str(config))))
+        for title, values, serie_config in pickle.loads(b64decode(
+                str(series))):
             graph.add(title, values, **serie_config)
         return graph.render_response()
 
     @app.route("/table/<type>/<series>/<config>")
     def table(type, series, config):
         graph = get(type)(pickle.loads(b64decode(str(config))))
-        for title, values, serie_config in pickle.loads(
-                b64decode(str(series))):
+        for title, values, serie_config in pickle.loads(b64decode(
+                str(series))):
             graph.add(title, values, **serie_config)
         return graph.render_table()
 
@@ -134,17 +140,19 @@ def create_app():
         line = pygal.Line(style=style, pretty_print=True)
         line.add('_', [random.randrange(0, 10) for _ in range(25)])
         return Response(
-            line.render_sparkline(height=40), mimetype='image/svg+xml')
+            line.render_sparkline(height=40), mimetype='image/svg+xml'
+        )
 
     @app.route("/with/table/<type>")
     def with_table(type):
         chart = pygal.StackedBar(
-            disable_xml_declaration=True,
-            x_label_rotation=35)
+            disable_xml_declaration=True, x_label_rotation=35
+        )
         chart.title = (
             'What Linux distro do you primarily use'
             ' on your server computers? (Desktop'
-            ' users vs Server Users)')
+            ' users vs Server Users)'
+        )
 
         if type == 'series':
             chart.add('Debian', [1775, 82])
@@ -170,14 +178,18 @@ def create_app():
                 'Red Hat Enterprise Linux', 'Gentoo', 'Fedora', 'Amazon Linux',
                 'OpenSUSE', 'Slackware', 'Xubuntu', 'Rasbian',
                 'SUSE Linux Enterprise Server', 'Linux Mint',
-                'Scientific Linux', 'Other']
-            chart.add('Desktop Users', [
-                1775, 1515, 807, 549, 247, 129, 91, 60, 58, 50, 38, 33, 33,
-                30, 32, 187
-            ])
-            chart.add('Server Users', [
-                82, 80, 60, 12, 10, 7, 6, 0, 0, 3, 1, 4, 1, 4, 0, 5
-            ])
+                'Scientific Linux', 'Other'
+            ]
+            chart.add(
+                'Desktop Users', [
+                    1775, 1515, 807, 549, 247, 129, 91, 60, 58, 50, 38, 33, 33,
+                    30, 32, 187
+                ]
+            )
+            chart.add(
+                'Server Users',
+                [82, 80, 60, 12, 10, 7, 6, 0, 0, 3, 1, 4, 1, 4, 0, 5]
+            )
 
         return render_template('table.jinja2', chart=chart)
 
@@ -194,13 +206,13 @@ def create_app():
             style = styles[style]
         else:
             style = parametric_styles[style](
-                color, base_style=styles[base_style or 'default'])
+                color, base_style=styles[base_style or 'default']
+            )
 
         xy_series = _random(data, order)
         other_series = []
         for title, values, config in xy_series:
-            other_series.append(
-                (title, cut(values, 1), config))
+            other_series.append((title, cut(values, 1), config))
         xy_series = b64encode(pickle.dumps(xy_series))
         other_series = b64encode(pickle.dumps(other_series))
         config = Config()
@@ -216,14 +228,15 @@ def create_app():
                 config.x_labels = None
             else:
                 config.x_labels = [random_label() for i in range(data)]
-            svgs.append({'type': type,
-                         'series': xy_series if chart._dual else other_series,
-                         'config': b64encode(pickle.dumps(config))})
+            svgs.append({
+                'type': type,
+                'series': xy_series if chart._dual else other_series,
+                'config': b64encode(pickle.dumps(config))
+            })
 
-        return render_template('svgs.jinja2',
-                               svgs=svgs,
-                               width=width,
-                               height=height)
+        return render_template(
+            'svgs.jinja2', svgs=svgs, width=width, height=height
+        )
 
     @app.route("/rotation")
     def rotation():
@@ -244,14 +257,15 @@ def create_app():
             config.x_labels = labels
             config.x_label_rotation = angle
             config.y_label_rotation = angle
-            svgs.append({'type': 'pygal.Bar',
-                         'series': series,
-                         'config': b64encode(pickle.dumps(config))})
+            svgs.append({
+                'type': 'pygal.Bar',
+                'series': series,
+                'config': b64encode(pickle.dumps(config))
+            })
 
-        return render_template('svgs.jinja2',
-                               svgs=svgs,
-                               width=width,
-                               height=height)
+        return render_template(
+            'svgs.jinja2', svgs=svgs, width=width, height=height
+        )
 
     @app.route("/interpolation")
     def interpolation():
@@ -268,51 +282,56 @@ def create_app():
         for interpolation in 'quadratic', 'cubic', 'lagrange', 'trigonometric':
             config.title = "%s interpolation" % interpolation
             config.interpolate = interpolation
-            svgs.append({'type': 'pygal.StackedLine',
-                         'series': series,
-                         'config': b64encode(pickle.dumps(config))})
-
-        for params in [
-                {'type': 'catmull_rom'},
-                {'type': 'finite_difference'},
-                {'type': 'cardinal', 'c': .25},
-                {'type': 'cardinal', 'c': .5},
-                {'type': 'cardinal', 'c': .75},
-                {'type': 'cardinal', 'c': 1.5},
-                {'type': 'cardinal', 'c': 2},
-                {'type': 'cardinal', 'c': 5},
-                {'type': 'kochanek_bartels', 'b': 1, 'c': 1, 't': 1},
-                {'type': 'kochanek_bartels', 'b': -1, 'c': 1, 't': 1},
-                {'type': 'kochanek_bartels', 'b': 1, 'c': -1, 't': 1},
-                {'type': 'kochanek_bartels', 'b': 1, 'c': 1, 't': -1},
-                {'type': 'kochanek_bartels', 'b': -1, 'c': 1, 't': -1},
-                {'type': 'kochanek_bartels', 'b': -1, 'c': -1, 't': 1},
-                {'type': 'kochanek_bartels', 'b': -1, 'c': -1, 't': -1}
-        ]:
+            svgs.append({
+                'type': 'pygal.StackedLine',
+                'series': series,
+                'config': b64encode(pickle.dumps(config))
+            })
+
+        for params in [{'type': 'catmull_rom'}, {'type': 'finite_difference'},
+                       {'type': 'cardinal',
+                        'c': .25}, {'type': 'cardinal',
+                                    'c': .5}, {'type': 'cardinal', 'c': .75},
+                       {'type': 'cardinal',
+                        'c': 1.5}, {'type': 'cardinal',
+                                    'c': 2}, {'type': 'cardinal', 'c': 5},
+                       {'type': 'kochanek_bartels', 'b': 1, 'c': 1,
+                        't': 1}, {'type': 'kochanek_bartels', 'b': -1, 'c': 1,
+                                  't': 1}, {'type': 'kochanek_bartels', 'b': 1,
+                                            'c': -1, 't': 1},
+                       {'type': 'kochanek_bartels', 'b': 1, 'c': 1, 't': -1}, {
+                           'type': 'kochanek_bartels', 'b': -1, 'c': 1, 't': -1
+                       }, {'type': 'kochanek_bartels', 'b': -1, 'c': -1,
+                           't': 1}, {'type': 'kochanek_bartels', 'b': -1,
+                                     'c': -1, 't': -1}]:
             config.title = "Hermite interpolation with params %r" % params
             config.interpolate = 'hermite'
             config.interpolation_parameters = params
-            svgs.append({'type': 'pygal.StackedLine',
-                         'series': series,
-                         'config': b64encode(pickle.dumps(config))})
+            svgs.append({
+                'type': 'pygal.StackedLine',
+                'series': series,
+                'config': b64encode(pickle.dumps(config))
+            })
 
-        return render_template('svgs.jinja2',
-                               svgs=svgs,
-                               width=width,
-                               height=height)
+        return render_template(
+            'svgs.jinja2', svgs=svgs, width=width, height=height
+        )
 
     @app.route("/raw_svgs/")
     def raw_svgs():
         svgs = []
         for color in styles['neon'].colors:
-            chart = pygal.Pie(style=parametric_styles['rotate'](color),
-                              width=400, height=300)
+            chart = pygal.Pie(
+                style=parametric_styles['rotate'](color),
+                width=400,
+                height=300
+            )
             chart.title = color
             chart.disable_xml_declaration = True
             chart.explicit_size = True
             chart.js = ['http://l:2343/2.0.x/pygal-tooltips.js']
             for i in range(6):
-                chart.add(str(i), 2 ** i)
+                chart.add(str(i), 2**i)
             svgs.append(chart.render())
         return render_template('raw_svgs.jinja2', svgs=svgs)
 

demo/moulinrouge/data.py

@@ -17,12 +17,8 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 
-labels = ['AURSAUTRAUIA',
-          'dpvluiqhu enuie',
-          'su sru a nanan a',
-          '09_28_3023_98120398',
-          u'éàé瀮ð{æə|&']
-series = {
-    'Female': [4, 2, 3, 0, 2],
-    'Male': [5, 1, 1, 3, 2]
-}
+labels = [
+    'AURSAUTRAUIA', 'dpvluiqhu enuie', 'su sru a nanan a',
+    '09_28_3023_98120398', u'éàé瀮ð{æə|&'
+]
+series = {'Female': [4, 2, 3, 0, 2], 'Male': [5, 1, 1, 3, 2]}

docs/conf.py

@@ -32,12 +32,8 @@ sys.path.insert(0, os.path.join(os.path.abspath('.'), 'ext'))
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.doctest',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.coverage',
-    'sphinx.ext.viewcode',
-    'pygal_sphinx_directives'
+    'sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.intersphinx',
+    'sphinx.ext.coverage', 'sphinx.ext.viewcode', 'pygal_sphinx_directives'
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -112,7 +108,6 @@ pygments_style = 'sphinx'
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
 
-
 # on_rtd is whether we are on readthedocs.org
 on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
 
@@ -223,25 +218,27 @@ htmlhelp_basename = 'pygaldoc'
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
+    # The paper size ('letterpaper' or 'a4paper').
+    #'papersize': 'letterpaper',
 
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
+    # The font size ('10pt', '11pt' or '12pt').
+    #'pointsize': '10pt',
 
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
+    # Additional stuff for the LaTeX preamble.
+    #'preamble': '',
 
-# Latex figure (float) alignment
-#'figure_align': 'htbp',
+    # Latex figure (float) alignment
+    #'figure_align': 'htbp',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-  (master_doc, 'pygal.tex', 'pygal Documentation',
-   'Florian Mounier', 'manual'),
+    (
+        master_doc, 'pygal.tex', 'pygal Documentation', 'Florian Mounier',
+        'manual'
+    ),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -264,29 +261,25 @@ latex_documents = [
 # If false, no module index is generated.
 #latex_domain_indices = True
 
-
 # -- Options for manual page output ---------------------------------------
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'pygal', 'pygal Documentation',
-     [author], 1)
-]
+man_pages = [(master_doc, 'pygal', 'pygal Documentation', [author], 1)]
 
 # If true, show URL addresses after external links.
 #man_show_urls = False
 
-
 # -- Options for Texinfo output -------------------------------------------
 
 # Grouping the document tree into Texinfo files. List of tuples
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-  (master_doc, 'pygal', 'pygal Documentation',
-   author, 'pygal', 'One line description of project.',
-   'Miscellaneous'),
+    (
+        master_doc, 'pygal', 'pygal Documentation', author, 'pygal',
+        'One line description of project.', 'Miscellaneous'
+    ),
 ]
 
 # Documents to append as an appendix to all manuals.
@@ -301,6 +294,5 @@ texinfo_documents = [
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 #texinfo_no_detailmenu = False
 
-
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {'https://docs.python.org/': None}

docs/ext/pygal_sphinx_directives.py

@@ -17,7 +17,6 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 
-
 from traceback import format_exc, print_exc
 
 import docutils.core
@@ -37,7 +36,8 @@ pygal.config.Config.style.value = pygal.style.RotateStyle(
     foreground_subtle='#909090',
     opacity='.8',
     opacity_hover='.9',
-    transition='400ms ease-in')
+    transition='400ms ease-in'
+)
 
 
 class PygalDirective(Directive):
@@ -48,8 +48,8 @@ class PygalDirective(Directive):
     has_content = True
 
     def run(self):
-        width, height = map(int, self.arguments[:2]) if len(
-            self.arguments) >= 2 else (600, 400)
+        width, height = map(int, self.arguments[:2]
+                            ) if len(self.arguments) >= 2 else (600, 400)
         if len(self.arguments) == 1:
             self.render_fix = bool(self.arguments[0])
         elif len(self.arguments) == 3:
@@ -67,10 +67,15 @@ class PygalDirective(Directive):
         except Exception:
             print(code)
             print_exc()
-            return [docutils.nodes.system_message(
-                'An exception as occured during code parsing:'
-                ' \n %s' % format_exc(), type='ERROR', source='/',
-                level=3)]
+            return [
+                docutils.nodes.system_message(
+                    'An exception as occured during code parsing:'
+                    ' \n %s' % format_exc(),
+                    type='ERROR',
+                    source='/',
+                    level=3
+                )
+            ]
         if self.render_fix:
             rv = scope['rv']
         else:
@@ -81,9 +86,14 @@ class PygalDirective(Directive):
                     self.content.append(key + '.render()')
                     break
             if chart is None:
-                return [docutils.nodes.system_message(
-                    'No instance of graph found', level=3,
-                    type='ERROR', source='/')]
+                return [
+                    docutils.nodes.system_message(
+                        'No instance of graph found',
+                        level=3,
+                        type='ERROR',
+                        source='/'
+                    )
+                ]
             chart.config.width = width
             chart.config.height = height
             chart.explicit_size = True
@@ -91,27 +101,28 @@ class PygalDirective(Directive):
         try:
             svg = '<embed src="%s" />' % chart.render_data_uri()
         except Exception:
-            return [docutils.nodes.system_message(
-                'An exception as occured during graph generation:'
-                ' \n %s' % format_exc(), type='ERROR', source='/',
-                level=3)]
+            return [
+                docutils.nodes.system_message(
+                    'An exception as occured during graph generation:'
+                    ' \n %s' % format_exc(),
+                    type='ERROR',
+                    source='/',
+                    level=3
+                )
+            ]
         return [docutils.nodes.raw('', svg, format='html')]
 
 
 class PygalWithCode(PygalDirective):
-
     def run(self):
         node_list = super(PygalWithCode, self).run()
-        node_list.extend(CodeBlock(
-            self.name,
-            ['python'],
-            self.options,
-            self.content,
-            self.lineno,
-            self.content_offset,
-            self.block_text,
-            self.state,
-            self.state_machine).run())
+        node_list.extend(
+            CodeBlock(
+                self.name, ['python'], self.options, self.content, self.lineno,
+                self.content_offset, self.block_text, self.state,
+                self.state_machine
+            ).run()
+        )
 
         return [docutils.nodes.compound('', *node_list)]
 
@@ -134,29 +145,30 @@ class PygalTable(Directive):
             exec(code, scope)
         except Exception:
             print_exc()
-            return [docutils.nodes.system_message(
-                'An exception as occured during code parsing:'
-                ' \n %s' % format_exc(), type='ERROR', source='/',
-                level=3)]
+            return [
+                docutils.nodes.system_message(
+                    'An exception as occured during code parsing:'
+                    ' \n %s' % format_exc(),
+                    type='ERROR',
+                    source='/',
+                    level=3
+                )
+            ]
         rv = scope['rv']
 
         return [docutils.nodes.raw('', rv, format='html')]
 
 
 class PygalTableWithCode(PygalTable):
-
     def run(self):
         node_list = super(PygalTableWithCode, self).run()
-        node_list.extend(CodeBlock(
-            self.name,
-            ['python'],
-            self.options,
-            self.content,
-            self.lineno,
-            self.content_offset,
-            self.block_text,
-            self.state,
-            self.state_machine).run())
+        node_list.extend(
+            CodeBlock(
+                self.name, ['python'], self.options, self.content, self.lineno,
+                self.content_offset, self.block_text, self.state,
+                self.state_machine
+            ).run()
+        )
 
         return [docutils.nodes.compound('', *node_list)]
 

pygal/__init__.py

@@ -54,19 +54,20 @@ from pygal.graph.graph import Graph
 from pygal.config import Config
 from pygal import maps
 
-
-CHARTS_BY_NAME = dict(
-    [(k, v) for k, v in locals().items()
-     if isinstance(v, type) and issubclass(v, Graph) and v != Graph])
-
+CHARTS_BY_NAME = dict([
+    (k, v) for k, v in locals().items()
+    if isinstance(v, type) and issubclass(v, Graph) and v != Graph
+])
 
 from pygal.graph.map import BaseMap
 for entry in pkg_resources.iter_entry_points('pygal.maps'):
     try:
         module = entry.load()
     except Exception:
-        warnings.warn('Unable to load %s pygal plugin \n\n%s' % (
-            entry, traceback.format_exc()), Warning)
+        warnings.warn(
+            'Unable to load %s pygal plugin \n\n%s' %
+            (entry, traceback.format_exc()), Warning
+        )
         continue
     setattr(maps, entry.name, module)
     for k, v in module.__dict__.items():
@@ -78,7 +79,6 @@ CHARTS = list(CHARTS_BY_NAME.values())
 
 
 class PluginImportFixer(object):
-
     """
     Allow external map plugins to be imported from pygal.maps package.
 

pygal/_compat.py

@@ -73,6 +73,7 @@ try:
     from datetime import timezone
     utc = timezone.utc
 except ImportError:
+
     class UTC(tzinfo):
         def tzname(self, dt):
             return 'UTC'
@@ -82,6 +83,7 @@ except ImportError:
 
         def dst(self, dt):
             return None
+
     utc = UTC()
 
 

pygal/colors.py

@@ -81,8 +81,10 @@ def hsl_to_rgb(h, s, l):
         if 3 * h < 2:
             return m1 + 6 * (2 / 3 - h) * (m2 - m1)
         return m1
-    r, g, b = map(lambda x: round(x * 255),
-                  map(h_to_rgb, (h + 1 / 3, h, h - 1 / 3)))
+
+    r, g, b = map(
+        lambda x: round(x * 255), map(h_to_rgb, (h + 1 / 3, h, h - 1 / 3))
+    )
 
     return r, g, b
 
@@ -107,7 +109,8 @@ def parse_color(color):
         assert len(color) == 8
         type = type or '#rrggbbaa'
         r, g, b, a = [
-            int(''.join(c), 16) for c in zip(color[::2], color[1::2])]
+            int(''.join(c), 16) for c in zip(color[::2], color[1::2])
+        ]
         a /= 255
     elif color.startswith('rgb('):
         type = 'rgb'
@@ -116,8 +119,8 @@ def parse_color(color):
     elif color.startswith('rgba('):
         type = 'rgba'
         color = color[5:-1]
-        r, g, b, a = [int(c) for c in color.split(',')[:-1]] + [
-            float(color.split(',')[-1])]
+        r, g, b, a = [int(c) for c in color.split(',')[:-1]
+                      ] + [float(color.split(',')[-1])]
     return r, g, b, a, type
 
 
@@ -134,8 +137,9 @@ def unparse_color(r, g, b, a, type):
 
     if type == '#rgba':
         if r % 17 == 0 and g % 17 == 0 and b % 17 == 0:
-            return '#%x%x%x%x' % (int(r / 17), int(g / 17), int(b / 17),
-                                  int(a * 15))
+            return '#%x%x%x%x' % (
+                int(r / 17), int(g / 17), int(b / 17), int(a * 15)
+            )
         type = '#rrggbbaa'
 
     if type == '#rrggbb':

pygal/etree.py

@@ -25,7 +25,6 @@ import os
 
 
 class Etree(object):
-
     """Etree wrapper using lxml.etree or standard xml.etree"""
 
     def __init__(self):
@@ -46,8 +45,8 @@ class Etree(object):
 
     def __getattribute__(self, attr):
         """Retrieve attr from current active etree implementation"""
-        if (attr not in object.__getattribute__(self, '__dict__') and
-                attr not in Etree.__dict__):
+        if (attr not in object.__getattribute__(self, '__dict__')
+                and attr not in Etree.__dict__):
             return object.__getattribute__(self._etree, attr)
         return object.__getattribute__(self, attr)
 

pygal/formatters.py

@@ -46,14 +46,16 @@ class HumanReadable(Formatter):
         order = val and int(floor(log(abs(val)) / log(1000)))
         orders = self.ORDERS.split(" ")[int(order > 0)]
         if order == 0 or order > len(orders):
-            return float_format(val / (1000 ** int(order)))
+            return float_format(val / (1000**int(order)))
         return (
-            float_format(val / (1000 ** int(order))) +
-            orders[int(order) - int(order > 0)])
+            float_format(val / (1000**int(order))) +
+            orders[int(order) - int(order > 0)]
+        )
 
 
 class Significant(Formatter):
     """Show precision significant digit of float"""
+
     def __init__(self, precision=10):
         self.format = '%%.%dg' % precision
 

pygal/graph/__init__.py

@@ -16,5 +16,4 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Graph package containing all builtin charts"""

pygal/graph/bar.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Bar chart that presents grouped data with rectangular bars with lengths
 proportional to the values that they represent.
@@ -29,7 +28,6 @@ from pygal.util import alter, decorate, ident, swap
 
 
 class Bar(Graph):
-
     """Bar graph class"""
 
     _series_margin = .06
@@ -54,15 +52,25 @@ class Bar(Graph):
         width -= 2 * serie_margin
         height = self.view.y(zero) - y
         r = serie.rounded_bars * 1 if serie.rounded_bars else 0
-        alter(self.svg.transposable_node(
-            parent, 'rect',
-            x=x, y=y, rx=r, ry=r, width=width, height=height,
-            class_='rect reactive tooltip-trigger'), serie.metadata.get(i))
+        alter(
+            self.svg.transposable_node(
+                parent,
+                'rect',
+                x=x,
+                y=y,
+                rx=r,
+                ry=r,
+                width=width,
+                height=height,
+                class_='rect reactive tooltip-trigger'
+            ), serie.metadata.get(i)
+        )
         return x, y, width, height
 
     def _tooltip_and_print_values(
-            self, serie_node, serie, parent, i, val, metadata,
-            x, y, width, height):
+            self, serie_node, serie, parent, i, val, metadata, x, y, width,
+            height
+    ):
         transpose = swap if self.horizontal else ident
         x_center, y_center = transpose((x + width / 2, y + height / 2))
         x_top, y_top = transpose((x + width, y + height))
@@ -73,8 +81,8 @@ class Bar(Graph):
             v = serie.values[i]
         sign = -1 if v < self.zero else 1
         self._tooltip_data(
-            parent, val, x_center, y_center, "centered",
-            self._get_x_label(i))
+            parent, val, x_center, y_center, "centered", self._get_x_label(i)
+        )
 
         if self.print_values_position == 'top':
             if self.horizontal:
@@ -111,20 +119,21 @@ class Bar(Graph):
             val = self._format(serie, i)
 
             bar = decorate(
-                self.svg,
-                self.svg.node(bars, class_='bar'),
-                metadata)
+                self.svg, self.svg.node(bars, class_='bar'), metadata
+            )
 
             x_, y_, width, height = self._bar(
-                serie, bar, x, y, i, self.zero, secondary=rescale)
+                serie, bar, x, y, i, self.zero, secondary=rescale
+            )
 
             self._confidence_interval(
                 serie_node['overlay'], x_ + width / 2, y_, serie.values[i],
-                metadata)
+                metadata
+            )
 
             self._tooltip_and_print_values(
-                serie_node, serie, bar, i, val, metadata,
-                x_, y_, width, height)
+                serie_node, serie, bar, i, val, metadata, x_, y_, width, height
+            )
 
     def _compute(self):
         """Compute y min and max and y scale and set labels"""

pygal/graph/base.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Base for pygal charts"""
 
 from __future__ import division
@@ -36,7 +35,6 @@ from pygal.view import Box, Margin
 
 
 class BaseGraph(object):
-
     """Chart internal behaviour related functions"""
 
     _adapters = []
@@ -93,7 +91,7 @@ class BaseGraph(object):
         if not raw:
             return
 
-        adapters = list(self._adapters) or [lambda x:x]
+        adapters = list(self._adapters) or [lambda x: x]
         if self.logarithmic:
             for fun in not_zero, positive:
                 if fun in adapters:
@@ -103,19 +101,18 @@ class BaseGraph(object):
 
         self._adapt = reduce(compose, adapters) if not self.strict else ident
         self._x_adapt = reduce(
-            compose, self._x_adapters) if not self.strict and getattr(
-                self, '_x_adapters', None) else ident
+            compose, self._x_adapters
+        ) if not self.strict and getattr(self, '_x_adapters', None) else ident
 
         series = []
 
         raw = [(
-            list(raw_values) if not isinstance(
-                raw_values, dict) else raw_values,
-            serie_config_kwargs
+            list(raw_values) if not isinstance(raw_values, dict) else
+            raw_values, serie_config_kwargs
         ) for raw_values, serie_config_kwargs in raw]
 
-        width = max([len(values) for values, _ in raw] +
-                    [len(self.x_labels or [])])
+        width = max([len(values)
+                     for values, _ in raw] + [len(self.x_labels or [])])
 
         for raw_values, serie_config_kwargs in raw:
             metadata = {}
@@ -130,10 +127,9 @@ class BaseGraph(object):
                             value_list[self.x_labels.index(k)] = v
                     raw_values = value_list
 
-            for index, raw_value in enumerate(
-                    raw_values + (
-                        (width - len(raw_values)) * [None]  # aligning values
-                        if len(raw_values) < width else [])):
+            for index, raw_value in enumerate(raw_values + (
+                (width - len(raw_values)) * [None]  # aligning values
+                    if len(raw_values) < width else [])):
                 if isinstance(raw_value, dict):
                     raw_value = dict(raw_value)
                     value = raw_value.pop('value', None)
@@ -157,8 +153,8 @@ class BaseGraph(object):
                         value = (value, self.zero)
                     if self._x_adapt:
                         value = (
-                            self._x_adapt(value[0]),
-                            self._adapt(value[1]))
+                            self._x_adapt(value[0]), self._adapt(value[1])
+                        )
                     if isinstance(self, BaseMap):
                         value = (self._adapt(value[0]), value[1])
                     else:
@@ -168,11 +164,14 @@ class BaseGraph(object):
 
                 values.append(value)
             serie_config = SerieConfig()
-            serie_config(**dict((k, v) for k, v in self.state.__dict__.items()
-                                if k in dir(serie_config)))
+            serie_config(
+                **dict((k, v) for k, v in self.state.__dict__.items()
+                       if k in dir(serie_config))
+            )
             serie_config(**serie_config_kwargs)
             series.append(
-                Serie(offset + len(series), values, serie_config, metadata))
+                Serie(offset + len(series), values, serie_config, metadata)
+            )
         return series
 
     def setup(self, **kwargs):
@@ -185,11 +184,13 @@ class BaseGraph(object):
         self.state = State(self, **kwargs)
         if isinstance(self.style, type):
             self.style = self.style()
-        self.series = self.prepare_values(
-            [rs for rs in self.raw_series if not rs[1].get('secondary')]) or []
+        self.series = self.prepare_values([
+            rs for rs in self.raw_series if not rs[1].get('secondary')
+        ]) or []
         self.secondary_series = self.prepare_values(
-            [rs for rs in self.raw_series if rs[1].get('secondary')],
-            len(self.series)) or []
+            [rs for rs in self.raw_series
+             if rs[1].get('secondary')], len(self.series)
+        ) or []
         self.horizontal = getattr(self, 'horizontal', False)
         self.svg = Svg(self)
         self._x_labels = None
@@ -198,20 +199,23 @@ class BaseGraph(object):
         self._y_2nd_labels = None
         self.nodes = {}
         self.margin_box = Margin(
-            self.margin_top or self.margin,
-            self.margin_right or self.margin,
-            self.margin_bottom or self.margin,
-            self.margin_left or self.margin)
+            self.margin_top or self.margin, self.margin_right or self.margin,
+            self.margin_bottom or self.margin, self.margin_left or self.margin
+        )
         self._box = Box()
         self.view = None
         if self.logarithmic and self.zero == 0:
             # Explicit min to avoid interpolation dependency
-            positive_values = list(filter(
-                lambda x: x > 0,
-                [val[1] or 1 if self._dual else val
-                 for serie in self.series for val in serie.safe_values]))
-
-            self.zero = min(positive_values or (1,)) or 1
+            positive_values = list(
+                filter(
+                    lambda x: x > 0, [
+                        val[1] or 1 if self._dual else val
+                        for serie in self.series for val in serie.safe_values
+                    ]
+                )
+            )
+
+            self.zero = min(positive_values or (1, )) or 1
         if self._len < 3:
             self.interpolate = None
         self._draw()

pygal/graph/box.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Box plot: a convenient way to display series as box with whiskers and outliers
 Different types are available throught the box_mode option
@@ -31,7 +30,6 @@ from pygal.util import alter, decorate
 
 
 class Box(Graph):
-
     """
     Box plot
     For each series, shows the median value, the 25th and 75th percentiles,
@@ -49,17 +47,20 @@ class Box(Graph):
         """
         if self.box_mode == "extremes":
             return (
-                'Min: %s\nQ1 : %s\nQ2 : %s\nQ3 : %s\nMax: %s' % tuple(
-                    map(self._y_format, serie.points[1:6])))
+                'Min: %s\nQ1 : %s\nQ2 : %s\nQ3 : %s\nMax: %s' %
+                tuple(map(self._y_format, serie.points[1:6]))
+            )
         elif self.box_mode in ["tukey", "stdev", "pstdev"]:
             return (
                 'Min: %s\nLower Whisker: %s\nQ1: %s\nQ2: %s\nQ3: %s\n'
-                'Upper Whisker: %s\nMax: %s' % tuple(map(
-                    self._y_format, serie.points)))
+                'Upper Whisker: %s\nMax: %s' %
+                tuple(map(self._y_format, serie.points))
+            )
         elif self.box_mode == '1.5IQR':
             # 1.5IQR mode
-            return 'Q1: %s\nQ2: %s\nQ3: %s' % tuple(map(
-                self._y_format, serie.points[2:5]))
+            return 'Q1: %s\nQ2: %s\nQ3: %s' % tuple(
+                map(self._y_format, serie.points[2:5])
+            )
         else:
             return self._y_format(serie.points)
 
@@ -72,8 +73,7 @@ class Box(Graph):
             serie.points, serie.outliers = \
                 self._box_points(serie.values, self.box_mode)
 
-        self._x_pos = [
-            (i + .5) / self._order for i in range(self._order)]
+        self._x_pos = [(i + .5) / self._order for i in range(self._order)]
 
         if self._min:
             self._box.ymin = min(self._min, self.zero)
@@ -100,17 +100,17 @@ class Box(Graph):
 
         metadata = serie.metadata.get(0)
 
-        box = decorate(
-            self.svg,
-            self.svg.node(boxes, class_='box'),
-            metadata)
+        box = decorate(self.svg, self.svg.node(boxes, class_='box'), metadata)
 
         val = self._format(serie, 0)
 
         x_center, y_center = self._draw_box(
-            box, serie.points[1:6], serie.outliers, serie.index, metadata)
-        self._tooltip_data(box, val, x_center, y_center, "centered",
-                           self._get_x_label(serie.index))
+            box, serie.points[1:6], serie.outliers, serie.index, metadata
+        )
+        self._tooltip_data(
+            box, val, x_center, y_center, "centered",
+            self._get_x_label(serie.index)
+        )
         self._static_value(serie_node, val, x_center, y_center, metadata)
 
     def _draw_box(self, parent_node, quartiles, outliers, box_index, metadata):
@@ -124,55 +124,78 @@ class Box(Graph):
         width -= 2 * series_margin
 
         # draw lines for whiskers - bottom, median, and top
-        for i, whisker in enumerate(
-                (quartiles[0], quartiles[2], quartiles[4])):
+        for i, whisker in enumerate((quartiles[0], quartiles[2],
+                                     quartiles[4])):
             whisker_width = width if i == 1 else width / 2
             shift = (width - whisker_width) / 2
             xs = left_edge + shift
             xe = left_edge + width - shift
-            alter(self.svg.line(
-                parent_node,
-                coords=[(xs, self.view.y(whisker)),
-                        (xe, self.view.y(whisker))],
-                class_='reactive tooltip-trigger',
-                attrib={'stroke-width': 3}), metadata)
+            alter(
+                self.svg.line(
+                    parent_node,
+                    coords=[(xs, self.view.y(whisker)),
+                            (xe, self.view.y(whisker))],
+                    class_='reactive tooltip-trigger',
+                    attrib={
+                        'stroke-width': 3
+                    }
+                ), metadata
+            )
 
         # draw lines connecting whiskers to box (Q1 and Q3)
-        alter(self.svg.line(
-            parent_node,
-            coords=[(left_edge + width / 2, self.view.y(quartiles[0])),
-                    (left_edge + width / 2, self.view.y(quartiles[1]))],
-            class_='reactive tooltip-trigger',
-            attrib={'stroke-width': 2}), metadata)
-        alter(self.svg.line(
-            parent_node,
-            coords=[(left_edge + width / 2, self.view.y(quartiles[4])),
-                    (left_edge + width / 2, self.view.y(quartiles[3]))],
-            class_='reactive tooltip-trigger',
-            attrib={'stroke-width': 2}), metadata)
+        alter(
+            self.svg.line(
+                parent_node,
+                coords=[(left_edge + width / 2, self.view.y(quartiles[0])),
+                        (left_edge + width / 2, self.view.y(quartiles[1]))],
+                class_='reactive tooltip-trigger',
+                attrib={
+                    'stroke-width': 2
+                }
+            ), metadata
+        )
+        alter(
+            self.svg.line(
+                parent_node,
+                coords=[(left_edge + width / 2, self.view.y(quartiles[4])),
+                        (left_edge + width / 2, self.view.y(quartiles[3]))],
+                class_='reactive tooltip-trigger',
+                attrib={
+                    'stroke-width': 2
+                }
+            ), metadata
+        )
 
         # box, bounded by Q1 and Q3
-        alter(self.svg.node(
-            parent_node,
-            tag='rect',
-            x=left_edge,
-            y=self.view.y(quartiles[1]),
-            height=self.view.y(quartiles[3]) - self.view.y(quartiles[1]),
-            width=width,
-            class_='subtle-fill reactive tooltip-trigger'), metadata)
+        alter(
+            self.svg.node(
+                parent_node,
+                tag='rect',
+                x=left_edge,
+                y=self.view.y(quartiles[1]),
+                height=self.view.y(quartiles[3]) - self.view.y(quartiles[1]),
+                width=width,
+                class_='subtle-fill reactive tooltip-trigger'
+            ), metadata
+        )
 
         # draw outliers
         for o in outliers:
-            alter(self.svg.node(
-                parent_node,
-                tag='circle',
-                cx=left_edge + width / 2,
-                cy=self.view.y(o),
-                r=3,
-                class_='subtle-fill reactive tooltip-trigger'), metadata)
-
-        return (left_edge + width / 2, self.view.y(
-            sum(quartiles) / len(quartiles)))
+            alter(
+                self.svg.node(
+                    parent_node,
+                    tag='circle',
+                    cx=left_edge + width / 2,
+                    cy=self.view.y(o),
+                    r=3,
+                    class_='subtle-fill reactive tooltip-trigger'
+                ), metadata
+            )
+
+        return (
+            left_edge + width / 2,
+            self.view.y(sum(quartiles) / len(quartiles))
+        )
 
     @staticmethod
     def _box_points(values, mode='extremes'):
@@ -199,6 +222,7 @@ class Box(Graph):
         Sincich, T. L. Statistics for Engineering and the
         Sciences, 4th ed. Prentice-Hall, 1995.
         """
+
         def median(seq):
             n = len(seq)
             if n % 2 == 0:  # seq has an even length

pygal/graph/dot.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Dot chart displaying values as a grid of dots, the bigger the value
 the bigger the dot
@@ -33,7 +32,6 @@ from pygal.view import ReverseView, View
 
 
 class Dot(Graph):
-
     """Dot graph class"""
 
     def dot(self, serie, r_max):
@@ -48,10 +46,8 @@ class Dot(Graph):
                 log10max = log10(self._max or 1)
 
                 if value != 0:
-                    size = r_max * (
-                        (log10(abs(value)) - log10min) /
-                        (log10max - log10min)
-                    )
+                    size = r_max * ((log10(abs(value)) - log10min) /
+                                    (log10max - log10min))
                 else:
                     size = 0
             else:
@@ -59,19 +55,25 @@ class Dot(Graph):
 
             metadata = serie.metadata.get(i)
             dots = decorate(
-                self.svg,
-                self.svg.node(serie_node['plot'], class_="dots"),
-                metadata)
-            alter(self.svg.node(
-                dots, 'circle',
-                cx=x, cy=y, r=size,
-                class_='dot reactive tooltip-trigger' + (
-                    ' negative' if value < 0 else '')), metadata)
+                self.svg, self.svg.node(serie_node['plot'], class_="dots"),
+                metadata
+            )
+            alter(
+                self.svg.node(
+                    dots,
+                    'circle',
+                    cx=x,
+                    cy=y,
+                    r=size,
+                    class_='dot reactive tooltip-trigger' +
+                    (' negative' if value < 0 else '')
+                ), metadata
+            )
 
             val = self._format(serie, i)
             self._tooltip_data(
-                dots, val, x, y, 'centered',
-                self._get_x_label(i))
+                dots, val, x, y, 'centered', self._get_x_label(i)
+            )
             self._static_value(serie_node, val, x, y, metadata)
 
     def _compute(self):
@@ -85,26 +87,28 @@ class Dot(Graph):
         self._y_pos = [n / 2 for n in reversed(range(1, 2 * y_len, 2))]
 
         for j, serie in enumerate(self.series):
-            serie.points = [
-                (self._x_pos[i], self._y_pos[j])
-                for i in range(x_len)]
+            serie.points = [(self._x_pos[i], self._y_pos[j])
+                            for i in range(x_len)]
 
     def _compute_y_labels(self):
-        self._y_labels = list(zip(
-            self.y_labels and map(to_str, self.y_labels) or [
-                serie.title['title']
-                if isinstance(serie.title, dict)
-                else serie.title or '' for serie in self.series],
-            self._y_pos))
+        self._y_labels = list(
+            zip(
+                self.y_labels and map(to_str, self.y_labels) or [
+                    serie.title['title']
+                    if isinstance(serie.title, dict) else serie.title or ''
+                    for serie in self.series
+                ], self._y_pos
+            )
+        )
 
     def _set_view(self):
         """Assign a view to current graph"""
         view_class = ReverseView if self.inverse_y_axis else View
 
         self.view = view_class(
-            self.width - self.margin_box.x,
-            self.height - self.margin_box.y,
-            self._box)
+            self.width - self.margin_box.x, self.height - self.margin_box.y,
+            self._box
+        )
 
     @cached_property
     def _values(self):
@@ -114,14 +118,16 @@ class Dot(Graph):
     @cached_property
     def _max(self):
         """Getter for the maximum series value"""
-        return (self.range[1] if (self.range and self.range[1] is not None)
-                else (max(map(abs, self._values)) if self._values else None))
+        return (
+            self.range[1] if (self.range and self.range[1] is not None) else
+            (max(map(abs, self._values)) if self._values else None)
+        )
 
     def _plot(self):
         """Plot all dots for series"""
         r_max = min(
             self.view.x(1) - self.view.x(0),
-            (self.view.y(0) or 0) - self.view.y(1)) / (
-                2 * 1.05)
+            (self.view.y(0) or 0) - self.view.y(1)
+        ) / (2 * 1.05)
         for serie in self.series:
             self.dot(serie, r_max)

pygal/graph/dual.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Dual chart base. Dual means a chart with 2 scaled axis like xy"""
 
 from pygal._compat import is_str
@@ -31,14 +30,12 @@ class Dual(Graph):
         """
         Format value for dual value display.
         """
-        return '%s: %s' % (
-            self._x_format(value[0]),
-            self._y_format(value[1]))
+        return '%s: %s' % (self._x_format(value[0]), self._y_format(value[1]))
 
     def _compute_x_labels(self):
         x_pos = compute_scale(
-            self._box.xmin, self._box.xmax, self.logarithmic,
-            self.order_min, self.min_scale, self.max_scale
+            self._box.xmin, self._box.xmax, self.logarithmic, self.order_min,
+            self.min_scale, self.max_scale
         )
         if self.x_labels:
             self._x_labels = []
@@ -63,7 +60,8 @@ class Dual(Graph):
     def _compute_x_labels_major(self):
         # In case of dual, x labels must adapters and so majors too
         self.x_labels_major = self.x_labels_major and list(
-            map(self._x_adapt, self.x_labels_major))
+            map(self._x_adapt, self.x_labels_major)
+        )
         super(Dual, self)._compute_x_labels_major()
 
     def _get_x_label(self, i):

pygal/graph/funnel.py

@@ -26,7 +26,6 @@ from pygal.util import alter, cut, decorate
 
 
 class Funnel(Graph):
-
     """Funnel graph class"""
 
     _adapters = [positive, none_to_zero]
@@ -44,22 +43,27 @@ class Funnel(Graph):
             val = self._format(serie, i)
 
             funnels = decorate(
-                self.svg,
-                self.svg.node(serie_node['plot'], class_="funnels"),
-                metadata)
-
-            alter(self.svg.node(
-                funnels, 'polygon',
-                points=' '.join(map(fmt, map(self.view, poly))),
-                class_='funnel reactive tooltip-trigger'), metadata)
+                self.svg, self.svg.node(serie_node['plot'], class_="funnels"),
+                metadata
+            )
+
+            alter(
+                self.svg.node(
+                    funnels,
+                    'polygon',
+                    points=' '.join(map(fmt, map(self.view, poly))),
+                    class_='funnel reactive tooltip-trigger'
+                ), metadata
+            )
 
             # Poly center from label
             x, y = self.view((
                 self._center(self._x_pos[serie.index]),
-                sum([point[1] for point in poly]) / len(poly)))
+                sum([point[1] for point in poly]) / len(poly)
+            ))
             self._tooltip_data(
-                funnels, val, x, y, 'centered',
-                self._get_x_label(serie.index))
+                funnels, val, x, y, 'centered', self._get_x_label(serie.index)
+            )
             self._static_value(serie_node, val, x, y, metadata)
 
     def _center(self, x):
@@ -73,7 +77,7 @@ class Funnel(Graph):
 
         previous = [[self.zero, self.zero] for i in range(self._len)]
         for i, serie in enumerate(self.series):
-            y_height = - sum(serie.safe_values) / 2
+            y_height = -sum(serie.safe_values) / 2
             all_x_pos = [0] + self._x_pos
             serie.points = []
             for j, value in enumerate(serie.values):
@@ -98,12 +102,14 @@ class Funnel(Graph):
 
     def _compute_x_labels(self):
         self._x_labels = list(
-            zip(self.x_labels and
-                map(self._x_format, self.x_labels) or [
+            zip(
+                self.x_labels and map(self._x_format, self.x_labels) or [
                     serie.title['title']
-                    if isinstance(serie.title, dict)
-                    else serie.title or '' for serie in self.series],
-                map(self._center, self._x_pos)))
+                    if isinstance(serie.title, dict) else serie.title or ''
+                    for serie in self.series
+                ], map(self._center, self._x_pos)
+            )
+        )
 
     def _plot(self):
         """Plot the funnel"""

pygal/graph/gauge.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Gauge chart representing values as needles on a polar scale"""
 
 from __future__ import division
@@ -28,7 +27,6 @@ from pygal.view import PolarThetaLogView, PolarThetaView
 
 
 class Gauge(Graph):
-
     """Gauge graph class"""
 
     needle_width = 1 / 20
@@ -41,9 +39,9 @@ class Gauge(Graph):
             view_class = PolarThetaView
 
         self.view = view_class(
-            self.width - self.margin_box.x,
-            self.height - self.margin_box.y,
-            self._box)
+            self.width - self.margin_box.x, self.height - self.margin_box.y,
+            self._box
+        )
 
     def needle(self, serie):
         """Draw a needle for each value"""
@@ -58,9 +56,9 @@ class Gauge(Graph):
             val = self._format(serie, i)
             metadata = serie.metadata.get(i)
             gauges = decorate(
-                self.svg,
-                self.svg.node(serie_node['plot'], class_="dots"),
-                metadata)
+                self.svg, self.svg.node(serie_node['plot'], class_="dots"),
+                metadata
+            )
 
             tolerance = 1.15
 
@@ -73,23 +71,24 @@ class Gauge(Graph):
             w = (self._box._tmax - self._box._tmin + self.view.aperture) / 4
 
             if self.logarithmic:
-                w = min(w, self._min - self._min * 10 ** -10)
+                w = min(w, self._min - self._min * 10**-10)
 
             alter(
                 self.svg.node(
-                    gauges, 'path', d='M %s L %s A %s 1 0 1 %s Z' % (
+                    gauges,
+                    'path',
+                    d='M %s L %s A %s 1 0 1 %s Z' % (
                         point(.85, theta),
                         point(self.needle_width, theta - w),
                         '%f %f' % (self.needle_width, self.needle_width),
                         point(self.needle_width, theta + w),
                     ),
-                    class_='line reactive tooltip-trigger'),
-                metadata)
+                    class_='line reactive tooltip-trigger'
+                ), metadata
+            )
 
             x, y = self.view((.75, theta))
-            self._tooltip_data(
-                gauges, val, x, y,
-                xlabel=self._get_x_label(i))
+            self._tooltip_data(gauges, val, x, y, xlabel=self._get_x_label(i))
             self._static_value(serie_node, val, x, y, metadata)
 
     def _y_axis(self, draw_axes=True):
@@ -100,26 +99,26 @@ class Gauge(Graph):
             guides = self.svg.node(axis, class_='guides')
 
             self.svg.line(
-                guides, [self.view((.95, theta)), self.view((1, theta))],
+                guides, [self.view((.95, theta)),
+                         self.view((1, theta))],
                 close=True,
-                class_='line')
+                class_='line'
+            )
 
             self.svg.line(
-                guides, [self.view((0, theta)), self.view((.95, theta))],
+                guides, [self.view((0, theta)),
+                         self.view((.95, theta))],
                 close=True,
-                class_='guide line %s' % (
-                    'major' if i in (0, len(self._y_labels) - 1)
-                    else ''))
+                class_='guide line %s' %
+                ('major' if i in (0, len(self._y_labels) - 1) else '')
+            )
 
             x, y = self.view((.9, theta))
-            self.svg.node(
-                guides, 'text',
-                x=x,
-                y=y
-            ).text = label
+            self.svg.node(guides, 'text', x=x, y=y).text = label
 
             self.svg.node(
-                guides, 'title',
+                guides,
+                'title',
             ).text = self._y_format(theta)
 
     def _x_axis(self, draw_axes=True):
@@ -136,18 +135,15 @@ class Gauge(Graph):
             self.min_ -= 1
             self.max_ += 1
 
-        self._box.set_polar_box(
-            0, 1,
-            self.min_,
-            self.max_)
+        self._box.set_polar_box(0, 1, self.min_, self.max_)
 
     def _compute_x_labels(self):
         pass
 
     def _compute_y_labels(self):
         y_pos = compute_scale(
-            self.min_, self.max_, self.logarithmic,
-            self.order_min, self.min_scale, self.max_scale
+            self.min_, self.max_, self.logarithmic, self.order_min,
+            self.min_scale, self.max_scale
         )
         if self.y_labels:
             self._y_labels = []
@@ -164,10 +160,7 @@ class Gauge(Graph):
                 self._y_labels.append((title, pos))
             self.min_ = min(self.min_, min(cut(self._y_labels, 1)))
             self.max_ = max(self.max_, max(cut(self._y_labels, 1)))
-            self._box.set_polar_box(
-                0, 1,
-                self.min_,
-                self.max_)
+            self._box.set_polar_box(0, 1, self.min_, self.max_)
         else:
             self._y_labels = list(zip(map(self._y_format, y_pos), y_pos))
 

pygal/graph/graph.py

@@ -28,12 +28,12 @@ from pygal.graph.public import PublicApi
 from pygal.interpolate import INTERPOLATIONS
 from pygal.util import (
     cached_property, compute_scale, cut, decorate, filter_kwargs, get_text_box,
-    get_texts_box, majorize, rad, reverse_text_len, split_title, truncate)
+    get_texts_box, majorize, rad, reverse_text_len, split_title, truncate
+)
 from pygal.view import LogView, ReverseView, View, XYLogView
 
 
 class Graph(PublicApi):
-
     """Graph super class containing generic common functions"""
 
     _dual = False
@@ -64,65 +64,93 @@ class Graph(PublicApi):
             view_class = ReverseView if self.inverse_y_axis else View
 
         self.view = view_class(
-            self.width - self.margin_box.x,
-            self.height - self.margin_box.y,
-            self._box)
+            self.width - self.margin_box.x, self.height - self.margin_box.y,
+            self._box
+        )
 
     def _make_graph(self):
         """Init common graph svg structure"""
         self.nodes['graph'] = self.svg.node(
             class_='graph %s-graph %s' % (
                 self.__class__.__name__.lower(),
-                'horizontal' if self.horizontal else 'vertical'))
-        self.svg.node(self.nodes['graph'], 'rect',
-                      class_='background',
-                      x=0, y=0,
-                      width=self.width,
-                      height=self.height)
+                'horizontal' if self.horizontal else 'vertical'
+            )
+        )
+        self.svg.node(
+            self.nodes['graph'],
+            'rect',
+            class_='background',
+            x=0,
+            y=0,
+            width=self.width,
+            height=self.height
+        )
         self.nodes['plot'] = self.svg.node(
-            self.nodes['graph'], class_="plot",
-            transform="translate(%d, %d)" % (
-                self.margin_box.left, self.margin_box.top))
-        self.svg.node(self.nodes['plot'], 'rect',
-                      class_='background',
-                      x=0, y=0,
-                      width=self.view.width,
-                      height=self.view.height)
-        self.nodes['title'] = self.svg.node(
             self.nodes['graph'],
-            class_="titles")
+            class_="plot",
+            transform="translate(%d, %d)" %
+            (self.margin_box.left, self.margin_box.top)
+        )
+        self.svg.node(
+            self.nodes['plot'],
+            'rect',
+            class_='background',
+            x=0,
+            y=0,
+            width=self.view.width,
+            height=self.view.height
+        )
+        self.nodes['title'] = self.svg.node(
+            self.nodes['graph'], class_="titles"
+        )
         self.nodes['overlay'] = self.svg.node(
-            self.nodes['graph'], class_="plot overlay",
-            transform="translate(%d, %d)" % (
-                self.margin_box.left, self.margin_box.top))
+            self.nodes['graph'],
+            class_="plot overlay",
+            transform="translate(%d, %d)" %
+            (self.margin_box.left, self.margin_box.top)
+        )
         self.nodes['text_overlay'] = self.svg.node(
-            self.nodes['graph'], class_="plot text-overlay",
-            transform="translate(%d, %d)" % (
-                self.margin_box.left, self.margin_box.top))
+            self.nodes['graph'],
+            class_="plot text-overlay",
+            transform="translate(%d, %d)" %
+            (self.margin_box.left, self.margin_box.top)
+        )
         self.nodes['tooltip_overlay'] = self.svg.node(
-            self.nodes['graph'], class_="plot tooltip-overlay",
-            transform="translate(%d, %d)" % (
-                self.margin_box.left, self.margin_box.top))
+            self.nodes['graph'],
+            class_="plot tooltip-overlay",
+            transform="translate(%d, %d)" %
+            (self.margin_box.left, self.margin_box.top)
+        )
         self.nodes['tooltip'] = self.svg.node(
             self.nodes['tooltip_overlay'],
             transform='translate(0 0)',
             style="opacity: 0",
-            **{'class': 'tooltip'})
+            **{
+                'class': 'tooltip'
+            }
+        )
 
-        self.svg.node(self.nodes['tooltip'], 'rect',
-                      rx=self.tooltip_border_radius,
-                      ry=self.tooltip_border_radius,
-                      width=0, height=0,
-                      **{'class': 'tooltip-box'})
+        self.svg.node(
+            self.nodes['tooltip'],
+            'rect',
+            rx=self.tooltip_border_radius,
+            ry=self.tooltip_border_radius,
+            width=0,
+            height=0,
+            **{
+                'class': 'tooltip-box'
+            }
+        )
         self.svg.node(self.nodes['tooltip'], 'g', class_='text')
 
     def _x_axis(self):
         """Make the x axis: labels and guides"""
         if not self._x_labels or not self.show_x_labels:
             return
-        axis = self.svg.node(self.nodes['plot'], class_="axis x%s" % (
-            ' always_show' if self.show_x_guides else ''
-        ))
+        axis = self.svg.node(
+            self.nodes['plot'],
+            class_="axis x%s" % (' always_show' if self.show_x_guides else '')
+        )
         truncation = self.truncate_label
         if not truncation:
             if self.x_label_rotation or len(self._x_labels) <= 1:
@@ -130,18 +158,21 @@ class Graph(PublicApi):
             else:
                 first_label_position = self.view.x(self._x_labels[0][1]) or 0
                 last_label_position = self.view.x(self._x_labels[-1][1]) or 0
-                available_space = (
-                    last_label_position - first_label_position) / (
-                    len(self._x_labels) - 1)
+                available_space = (last_label_position - first_label_position
+                                   ) / (len(self._x_labels) - 1)
                 truncation = reverse_text_len(
-                    available_space, self.style.label_font_size)
+                    available_space, self.style.label_font_size
+                )
                 truncation = max(truncation, 1)
 
         lastlabel = self._x_labels[-1][0]
         if 0 not in [label[1] for label in self._x_labels]:
-            self.svg.node(axis, 'path',
-                          d='M%f %f v%f' % (0, 0, self.view.height),
-                          class_='line')
+            self.svg.node(
+                axis,
+                'path',
+                d='M%f %f v%f' % (0, 0, self.view.height),
+                class_='line'
+            )
             lastlabel = None
 
         for label, position in self._x_labels:
@@ -158,18 +189,18 @@ class Graph(PublicApi):
             y = self.view.height + 5
             last_guide = (self._y_2nd_labels and label == lastlabel)
             self.svg.node(
-                guides, 'path',
+                guides,
+                'path',
                 d='M%f %f v%f' % (x or 0, 0, self.view.height),
                 class_='%s%s%sline' % (
-                    'axis ' if label == "0" else '',
-                    'major ' if major else '',
-                    'guide ' if position != 0 and not last_guide else ''))
+                    'axis ' if label == "0" else '', 'major '
+                    if major else '', 'guide '
+                    if position != 0 and not last_guide else ''
+                )
+            )
             y += .5 * self.style.label_font_size + 5
             text = self.svg.node(
-                guides, 'text',
-                x=x,
-                y=y,
-                class_='major' if major else ''
+                guides, 'text', x=x, y=y, class_='major' if major else ''
             )
 
             text.text = truncate(label, truncation)
@@ -177,29 +208,35 @@ class Graph(PublicApi):
                 self.svg.node(guides, 'title').text = label
             elif self._dual:
                 self.svg.node(
-                    guides, 'title',
+                    guides,
+                    'title',
                 ).text = self._x_format(position)
 
             if self.x_label_rotation:
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
-                    self.x_label_rotation, x, y)
+                    self.x_label_rotation, x, y
+                )
                 if self.x_label_rotation >= 180:
-                    text.attrib['class'] = ' '.join(
-                        (text.attrib['class'] and text.attrib['class'].split(
-                            ' ') or []) + ['backwards'])
+                    text.attrib['class'] = ' '.join((
+                        text.attrib['class']
+                        and text.attrib['class'].split(' ') or []
+                    ) + ['backwards'])
 
-        if self._y_2nd_labels and 0 not in [
-                label[1] for label in self._x_labels]:
-            self.svg.node(axis, 'path',
-                          d='M%f %f v%f' % (
-                              self.view.width, 0, self.view.height),
-                          class_='line')
+        if self._y_2nd_labels and 0 not in [label[1]
+                                            for label in self._x_labels]:
+            self.svg.node(
+                axis,
+                'path',
+                d='M%f %f v%f' % (self.view.width, 0, self.view.height),
+                class_='line'
+            )
 
         if self._x_2nd_labels:
             secondary_ax = self.svg.node(
-                self.nodes['plot'], class_="axis x x2%s" % (
-                    ' always_show' if self.show_x_guides else ''
-                ))
+                self.nodes['plot'],
+                class_="axis x x2%s" %
+                (' always_show' if self.show_x_guides else '')
+            )
             for label, position in self._x_2nd_labels:
                 major = label in self._x_labels_major
                 if not (self.show_minor_x_labels or major):
@@ -209,37 +246,38 @@ class Graph(PublicApi):
                 x = self.view.x(position)
                 y = -5
                 text = self.svg.node(
-                    guides, 'text',
-                    x=x,
-                    y=y,
-                    class_='major' if major else ''
+                    guides, 'text', x=x, y=y, class_='major' if major else ''
                 )
                 text.text = label
                 if self.x_label_rotation:
                     text.attrib['transform'] = "rotate(%d %f %f)" % (
-                        -self.x_label_rotation, x, y)
+                        -self.x_label_rotation, x, y
+                    )
                     if self.x_label_rotation >= 180:
                         text.attrib['class'] = ' '.join((
-                            text.attrib['class'] and
-                            text.attrib['class'].split(
-                                ' ') or []) + ['backwards'])
+                            text.attrib['class']
+                            and text.attrib['class'].split(' ') or []
+                        ) + ['backwards'])
 
     def _y_axis(self):
         """Make the y axis: labels and guides"""
         if not self._y_labels or not self.show_y_labels:
             return
 
-        axis = self.svg.node(self.nodes['plot'], class_="axis y%s" % (
-            ' always_show' if self.show_y_guides else ''
-        ))
+        axis = self.svg.node(
+            self.nodes['plot'],
+            class_="axis y%s" % (' always_show' if self.show_y_guides else '')
+        )
 
-        if (0 not in [label[1] for label in self._y_labels] and
-                self.show_y_guides):
+        if (0 not in [label[1] for label in self._y_labels]
+                and self.show_y_guides):
             self.svg.node(
-                axis, 'path',
+                axis,
+                'path',
                 d='M%f %f h%f' % (
                     0, 0 if self.inverse_y_axis else self.view.height,
-                    self.view.width),
+                    self.view.width
+                ),
                 class_='line'
             )
 
@@ -251,23 +289,28 @@ class Graph(PublicApi):
 
             if not (self.show_minor_y_labels or major):
                 continue
-            guides = self.svg.node(axis, class_='%sguides' % (
-                'logarithmic ' if self.logarithmic else ''
-            ))
+            guides = self.svg.node(
+                axis,
+                class_='%sguides' %
+                ('logarithmic ' if self.logarithmic else '')
+            )
             x = -5
             y = self.view.y(position)
             if not y:
                 continue
             if self.show_y_guides:
                 self.svg.node(
-                    guides, 'path',
+                    guides,
+                    'path',
                     d='M%f %f h%f' % (0, y, self.view.width),
                     class_='%s%s%sline' % (
-                        'axis ' if label == "0" else '',
-                        'major ' if major else '',
-                        'guide ' if position != 0 else ''))
+                        'axis ' if label == "0" else '', 'major '
+                        if major else '', 'guide ' if position != 0 else ''
+                    )
+                )
             text = self.svg.node(
-                guides, 'text',
+                guides,
+                'text',
                 x=x,
                 y=y + .35 * self.style.label_font_size,
                 class_='major' if major else ''
@@ -277,18 +320,20 @@ class Graph(PublicApi):
 
             if self.y_label_rotation:
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
-                    self.y_label_rotation, x, y)
+                    self.y_label_rotation, x, y
+                )
                 if 90 < self.y_label_rotation < 270:
-                    text.attrib['class'] = ' '.join(
-                        (text.attrib['class'] and text.attrib['class'].split(
-                            ' ') or []) + ['backwards'])
+                    text.attrib['class'] = ' '.join((
+                        text.attrib['class']
+                        and text.attrib['class'].split(' ') or []
+                    ) + ['backwards'])
             self.svg.node(
-                guides, 'title',
+                guides,
+                'title',
             ).text = self._y_format(position)
 
         if self._y_2nd_labels:
-            secondary_ax = self.svg.node(
-                self.nodes['plot'], class_="axis y2")
+            secondary_ax = self.svg.node(self.nodes['plot'], class_="axis y2")
             for label, position in self._y_2nd_labels:
                 major = position in self._y_labels_major
                 if not (self.show_minor_y_labels or major):
@@ -298,7 +343,8 @@ class Graph(PublicApi):
                 x = self.view.width + 5
                 y = self.view.y(position)
                 text = self.svg.node(
-                    guides, 'text',
+                    guides,
+                    'text',
                     x=x,
                     y=y + .35 * self.style.label_font_size,
                     class_='major' if major else ''
@@ -306,12 +352,13 @@ class Graph(PublicApi):
                 text.text = label
                 if self.y_label_rotation:
                     text.attrib['transform'] = "rotate(%d %f %f)" % (
-                        self.y_label_rotation, x, y)
+                        self.y_label_rotation, x, y
+                    )
                     if 90 < self.y_label_rotation < 270:
-                        text.attrib['class'] = ' '.join(
-                            (text.attrib['class'] and
-                             text.attrib['class'].split(
-                                ' ') or []) + ['backwards'])
+                        text.attrib['class'] = ' '.join((
+                            text.attrib['class']
+                            and text.attrib['class'].split(' ') or []
+                        ) + ['backwards'])
 
     def _legend(self):
         """Make the legend box"""
@@ -320,17 +367,20 @@ class Graph(PublicApi):
         truncation = self.truncate_legend
         if self.legend_at_bottom:
             x = self.margin_box.left + self.spacing
-            y = (self.margin_box.top + self.view.height +
-                 self._x_title_height +
-                 self._x_labels_height + self.spacing)
-            cols = self.legend_at_bottom_columns or ceil(
-                sqrt(self._order)) or 1
+            y = (
+                self.margin_box.top + self.view.height + self._x_title_height +
+                self._x_labels_height + self.spacing
+            )
+            cols = self.legend_at_bottom_columns or ceil(sqrt(self._order)
+                                                         ) or 1
 
             if not truncation:
                 available_space = self.view.width / cols - (
-                    self.legend_box_size + 5)
+                    self.legend_box_size + 5
+                )
                 truncation = reverse_text_len(
-                    available_space, self.style.legend_font_size)
+                    available_space, self.style.legend_font_size
+                )
         else:
             x = self.spacing
             y = self.margin_box.top + self.spacing
@@ -339,8 +389,10 @@ class Graph(PublicApi):
                 truncation = 15
 
         legends = self.svg.node(
-            self.nodes['graph'], class_='legends',
-            transform='translate(%d, %d)' % (x, y))
+            self.nodes['graph'],
+            class_='legends',
+            transform='translate(%d, %d)' % (x, y)
+        )
 
         h = max(self.legend_box_size, self.style.legend_font_size)
         x_step = self.view.width / cols
@@ -352,22 +404,25 @@ class Graph(PublicApi):
             x = self.margin_box.left + self.view.width + self.spacing
             if self._y_2nd_labels:
                 h, w = get_texts_box(
-                    cut(self._y_2nd_labels), self.style.label_font_size)
-                x += self.spacing + max(w * abs(cos(rad(
-                    self.y_label_rotation))), h)
+                    cut(self._y_2nd_labels), self.style.label_font_size
+                )
+                x += self.spacing + max(
+                    w * abs(cos(rad(self.y_label_rotation))), h
+                )
 
             y = self.margin_box.top + self.spacing
 
             secondary_legends = self.svg.node(
-                self.nodes['graph'], class_='legends',
-                transform='translate(%d, %d)' % (x, y))
+                self.nodes['graph'],
+                class_='legends',
+                transform='translate(%d, %d)' % (x, y)
+            )
 
         serie_number = -1
         i = 0
 
-        for titles, is_secondary in (
-                (self._legends, False),
-                (self._secondary_legends, True)):
+        for titles, is_secondary in ((self._legends, False),
+                                     (self._secondary_legends, True)):
             if not self.legend_at_bottom and is_secondary:
                 i = 0
 
@@ -381,9 +436,11 @@ class Graph(PublicApi):
                 legend = self.svg.node(
                     secondary_legends if is_secondary else legends,
                     class_='legend reactive activate-serie',
-                    id="activate-serie-%d" % serie_number)
+                    id="activate-serie-%d" % serie_number
+                )
                 self.svg.node(
-                    legend, 'rect',
+                    legend,
+                    'rect',
                     x=col * x_step,
                     y=1.5 * row * h + (
                         self.style.legend_font_size - self.legend_box_size
@@ -403,7 +460,8 @@ class Graph(PublicApi):
 
                 truncated = truncate(title, truncation)
                 self.svg.node(
-                    node, 'text',
+                    node,
+                    'text',
                     x=col * x_step + self.legend_box_size + 5,
                     y=1.5 * row * h + .5 * h + .3 * self.style.legend_font_size
                 ).text = truncated
@@ -418,19 +476,22 @@ class Graph(PublicApi):
         if self._title:
             for i, title_line in enumerate(self._title, 1):
                 self.svg.node(
-                    self.nodes['title'], 'text', class_='title plot_title',
+                    self.nodes['title'],
+                    'text',
+                    class_='title plot_title',
                     x=self.width / 2,
                     y=i * (self.style.title_font_size + self.spacing)
                 ).text = title_line
 
     def _make_x_title(self):
         """Make the X-Axis title"""
-        y = (self.height - self.margin_box.bottom +
-             self._x_labels_height)
+        y = (self.height - self.margin_box.bottom + self._x_labels_height)
         if self._x_title:
             for i, title_line in enumerate(self._x_title, 1):
                 text = self.svg.node(
-                    self.nodes['title'], 'text', class_='title',
+                    self.nodes['title'],
+                    'text',
+                    class_='title',
                     x=self.margin_box.left + self.view.width / 2,
                     y=y + i * (self.style.title_font_size + self.spacing)
                 )
@@ -442,12 +503,15 @@ class Graph(PublicApi):
             yc = self.margin_box.top + self.view.height / 2
             for i, title_line in enumerate(self._y_title, 1):
                 text = self.svg.node(
-                    self.nodes['title'], 'text', class_='title',
+                    self.nodes['title'],
+                    'text',
+                    class_='title',
                     x=self._legend_at_left_width,
                     y=i * (self.style.title_font_size + self.spacing) + yc
                 )
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
-                    -90, self._legend_at_left_width, yc)
+                    -90, self._legend_at_left_width, yc
+                )
                 text.text = title_line
 
     def _interpolate(self, xs, ys):
@@ -461,16 +525,19 @@ class Graph(PublicApi):
 
         interpolate = INTERPOLATIONS[self.interpolate]
 
-        return list(interpolate(
-            x, y, self.interpolation_precision,
-            **self.interpolation_parameters))
+        return list(
+            interpolate(
+                x, y, self.interpolation_precision,
+                **self.interpolation_parameters
+            )
+        )
 
     def _rescale(self, points):
         """Scale for secondary"""
-        return [
-            (x, self._scale_diff + (y - self._scale_min_2nd) * self._scale
-             if y is not None else None)
-            for x, y in points]
+        return [(
+            x, self._scale_diff + (y - self._scale_min_2nd) * self._scale
+            if y is not None else None
+        ) for x, y in points]
 
     def _tooltip_data(self, node, value, x, y, classes=None, xlabel=None):
         """Insert in desc tags informations for the javascript tooltip"""
@@ -483,16 +550,21 @@ class Graph(PublicApi):
                 classes.append('top')
             classes = ' '.join(classes)
 
-        self.svg.node(node, 'desc',
-                      class_="x " + classes).text = to_str(x)
-        self.svg.node(node, 'desc',
-                      class_="y " + classes).text = to_str(y)
+        self.svg.node(node, 'desc', class_="x " + classes).text = to_str(x)
+        self.svg.node(node, 'desc', class_="y " + classes).text = to_str(y)
         if xlabel:
-            self.svg.node(node, 'desc',
-                          class_="x_label").text = to_str(xlabel)
-
-    def _static_value(self, serie_node, value, x, y, metadata,
-                      align_text='left', classes=None):
+            self.svg.node(node, 'desc', class_="x_label").text = to_str(xlabel)
+
+    def _static_value(
+            self,
+            serie_node,
+            value,
+            x,
+            y,
+            metadata,
+            align_text='left',
+            classes=None
+    ):
         """Write the print value"""
         label = metadata and metadata.get('label')
         classes = classes and [classes] or []
@@ -502,7 +574,8 @@ class Graph(PublicApi):
             if self.print_values:
                 y -= self.style.value_font_size / 2
             self.svg.node(
-                serie_node['text_overlay'], 'text',
+                serie_node['text_overlay'],
+                'text',
                 class_=' '.join(label_cls),
                 x=x,
                 y=y + self.style.value_font_size / 3
@@ -515,11 +588,14 @@ class Graph(PublicApi):
                 val_cls.append('showable')
 
             self.svg.node(
-                serie_node['text_overlay'], 'text',
+                serie_node['text_overlay'],
+                'text',
                 class_=' '.join(val_cls),
                 x=x,
                 y=y + self.style.value_font_size / 3,
-                attrib={'text-anchor': align_text}
+                attrib={
+                    'text-anchor': align_text
+                }
             ).text = value if self.print_zeroes or value != '0' else ''
 
     def _points(self, x_pos):
@@ -528,9 +604,7 @@ class Graph(PublicApi):
         and interpolated points if interpolate option is specified
         """
         for serie in self.all_series:
-            serie.points = [
-                (x_pos[i], v)
-                for i, v in enumerate(serie.values)]
+            serie.points = [(x_pos[i], v) for i, v in enumerate(serie.values)]
             if serie.points and self.interpolate:
                 serie.interpolated = self._interpolate(x_pos, serie.values)
             else:
@@ -600,33 +674,18 @@ class Graph(PublicApi):
         value = serie.values[i]
         metadata = serie.metadata.get(i)
 
-        kwargs = {
-            'chart': self,
-            'serie': serie,
-            'index': i
-        }
-        formatter = (
-            (metadata and metadata.get('formatter')) or
-            serie.formatter or
-            self.formatter or
-            self._value_format
-        )
+        kwargs = {'chart': self, 'serie': serie, 'index': i}
+        formatter = ((metadata and metadata.get('formatter'))
+                     or serie.formatter or self.formatter
+                     or self._value_format)
         kwargs = filter_kwargs(formatter, kwargs)
         return formatter(value, **kwargs)
 
     def _serie_format(self, serie, value):
         """Format an independent value for the serie"""
 
-        kwargs = {
-            'chart': self,
-            'serie': serie,
-            'index': None
-        }
-        formatter = (
-            serie.formatter or
-            self.formatter or
-            self._value_format
-        )
+        kwargs = {'chart': self, 'serie': serie, 'index': None}
+        formatter = (serie.formatter or self.formatter or self._value_format)
         kwargs = filter_kwargs(formatter, kwargs)
         return formatter(value, **kwargs)
 
@@ -639,18 +698,24 @@ class Graph(PublicApi):
         for series_group in (self.series, self.secondary_series):
             if self.show_legend and series_group:
                 h, w = get_texts_box(
-                    map(lambda x: truncate(x, self.truncate_legend or 15),
-                        [serie.title['title']
-                         if isinstance(serie.title, dict)
-                         else serie.title or '' for serie in series_group]),
-                    self.style.legend_font_size)
+                    map(
+                        lambda x: truncate(x, self.truncate_legend or 15), [
+                            serie.title['title']
+                            if isinstance(serie.title, dict) else serie.title
+                            or '' for serie in series_group
+                        ]
+                    ), self.style.legend_font_size
+                )
                 if self.legend_at_bottom:
                     h_max = max(h, self.legend_box_size)
-                    cols = (self._order // self.legend_at_bottom_columns
-                            if self.legend_at_bottom_columns
-                            else ceil(sqrt(self._order)) or 1)
+                    cols = (
+                        self._order // self.legend_at_bottom_columns
+                        if self.legend_at_bottom_columns else
+                        ceil(sqrt(self._order)) or 1
+                    )
                     self.margin_box.bottom += self.spacing + h_max * round(
-                        cols - 1) * 1.5 + h_max
+                        cols - 1
+                    ) * 1.5 + h_max
                 else:
                     if series_group is self.series:
                         legend_width = self.spacing + w + self.legend_box_size
@@ -658,18 +723,22 @@ class Graph(PublicApi):
                         self._legend_at_left_width += legend_width
                     else:
                         self.margin_box.right += (
-                            self.spacing + w + self.legend_box_size)
+                            self.spacing + w + self.legend_box_size
+                        )
 
         self._x_labels_height = 0
         if (self._x_labels or self._x_2nd_labels) and self.show_x_labels:
             for xlabels in (self._x_labels, self._x_2nd_labels):
                 if xlabels:
                     h, w = get_texts_box(
-                        map(lambda x: truncate(x, self.truncate_label or 25),
-                            cut(xlabels)),
-                        self.style.label_font_size)
+                        map(
+                            lambda x: truncate(x, self.truncate_label or 25),
+                            cut(xlabels)
+                        ), self.style.label_font_size
+                    )
                     self._x_labels_height = self.spacing + max(
-                        w * abs(sin(rad(self.x_label_rotation))), h)
+                        w * abs(sin(rad(self.x_label_rotation))), h
+                    )
                     if xlabels is self._x_labels:
                         self.margin_box.bottom += self._x_labels_height
                     else:
@@ -678,26 +747,32 @@ class Graph(PublicApi):
                         if self.x_label_rotation % 180 < 90:
                             self.margin_box.right = max(
                                 w * abs(cos(rad(self.x_label_rotation))),
-                                self.margin_box.right)
+                                self.margin_box.right
+                            )
                         else:
                             self.margin_box.left = max(
                                 w * abs(cos(rad(self.x_label_rotation))),
-                                self.margin_box.left)
+                                self.margin_box.left
+                            )
 
         if self.show_y_labels:
             for ylabels in (self._y_labels, self._y_2nd_labels):
                 if ylabels:
                     h, w = get_texts_box(
-                        cut(ylabels), self.style.label_font_size)
+                        cut(ylabels), self.style.label_font_size
+                    )
                     if ylabels is self._y_labels:
                         self.margin_box.left += self.spacing + max(
-                            w * abs(cos(rad(self.y_label_rotation))), h)
+                            w * abs(cos(rad(self.y_label_rotation))), h
+                        )
                     else:
                         self.margin_box.right += self.spacing + max(
-                            w * abs(cos(rad(self.y_label_rotation))), h)
+                            w * abs(cos(rad(self.y_label_rotation))), h
+                        )
 
         self._title = split_title(
-            self.title, self.width, self.style.title_font_size)
+            self.title, self.width, self.style.title_font_size
+        )
 
         if self.title:
             h, _ = get_text_box(self._title[0], self.style.title_font_size)
@@ -705,7 +780,8 @@ class Graph(PublicApi):
 
         self._x_title = split_title(
             self.x_title, self.width - self.margin_box.x,
-            self.style.title_font_size)
+            self.style.title_font_size
+        )
 
         self._x_title_height = 0
         if self._x_title:
@@ -716,7 +792,8 @@ class Graph(PublicApi):
 
         self._y_title = split_title(
             self.y_title, self.height - self.margin_box.y,
-            self.style.title_font_size)
+            self.style.title_font_size
+        )
 
         self._y_title_height = 0
         if self._y_title:
@@ -741,15 +818,16 @@ class Graph(PublicApi):
         ci['point_estimate'] = value
 
         low, high = getattr(
-            stats,
-            'confidence_interval_%s' % ci.get('type', 'manual')
+            stats, 'confidence_interval_%s' % ci.get('type', 'manual')
         )(**ci)
 
         self.svg.confidence_interval(
-            node, x,
+            node,
+            x,
             # Respect some charts y modifications (pyramid, stackbar)
             y + (self.view.y(low) - self.view.y(value)),
-            y + (self.view.y(high) - self.view.y(value)))
+            y + (self.view.y(high) - self.view.y(value))
+        )
 
     @cached_property
     def _legends(self):
@@ -764,54 +842,59 @@ class Graph(PublicApi):
     @cached_property
     def _values(self):
         """Getter for series values (flattened)"""
-        return [val
-                for serie in self.series
-                for val in serie.values
-                if val is not None]
+        return [
+            val for serie in self.series for val in serie.values
+            if val is not None
+        ]
 
     @cached_property
     def _secondary_values(self):
         """Getter for secondary series values (flattened)"""
-        return [val
-                for serie in self.secondary_series
-                for val in serie.values
-                if val is not None]
+        return [
+            val for serie in self.secondary_series for val in serie.values
+            if val is not None
+        ]
 
     @cached_property
     def _len(self):
         """Getter for the maximum series size"""
-        return max([
-            len(serie.values)
-            for serie in self.all_series] or [0])
+        return max([len(serie.values) for serie in self.all_series] or [0])
 
     @cached_property
     def _secondary_min(self):
         """Getter for the minimum series value"""
-        return (self.secondary_range[0] if (
-            self.secondary_range and self.secondary_range[0] is not None)
-            else (min(self._secondary_values)
-                  if self._secondary_values else None))
+        return (
+            self.secondary_range[0]
+            if (self.secondary_range
+                and self.secondary_range[0] is not None) else
+            (min(self._secondary_values) if self._secondary_values else None)
+        )
 
     @cached_property
     def _min(self):
         """Getter for the minimum series value"""
-        return (self.range[0] if (self.range and self.range[0] is not None)
-                else (min(self._values)
-                      if self._values else None))
+        return (
+            self.range[0] if (self.range and self.range[0] is not None) else
+            (min(self._values) if self._values else None)
+        )
 
     @cached_property
     def _max(self):
         """Getter for the maximum series value"""
-        return (self.range[1] if (self.range and self.range[1] is not None)
-                else (max(self._values) if self._values else None))
+        return (
+            self.range[1] if (self.range and self.range[1] is not None) else
+            (max(self._values) if self._values else None)
+        )
 
     @cached_property
     def _secondary_max(self):
         """Getter for the maximum series value"""
-        return (self.secondary_range[1] if (
-            self.secondary_range and self.secondary_range[1] is not None)
-            else (max(self._secondary_values)
-                  if self._secondary_values else None))
+        return (
+            self.secondary_range[1]
+            if (self.secondary_range
+                and self.secondary_range[1] is not None) else
+            (max(self._secondary_values) if self._secondary_values else None)
+        )
 
     @cached_property
     def _order(self):
@@ -825,13 +908,18 @@ class Graph(PublicApi):
 
     def _compute_x_labels(self):
         self._x_labels = self.x_labels and list(
-            zip(map(self._x_label_format_if_value, self.x_labels),
-                self._x_pos))
+            zip(
+                map(self._x_label_format_if_value, self.x_labels), self._x_pos
+            )
+        )
 
     def _compute_x_labels_major(self):
         if self.x_labels_major_every:
-            self._x_labels_major = [self._x_labels[i][0] for i in range(
-                0, len(self._x_labels), self.x_labels_major_every)]
+            self._x_labels_major = [
+                self._x_labels[i][0]
+                for i in
+                range(0, len(self._x_labels), self.x_labels_major_every)
+            ]
 
         elif self.x_labels_major_count:
             label_count = len(self._x_labels)
@@ -840,17 +928,20 @@ class Graph(PublicApi):
                 self._x_labels_major = [label[0] for label in self._x_labels]
 
             else:
-                self._x_labels_major = [self._x_labels[
-                    int(i * (label_count - 1) / (major_count - 1))][0]
-                    for i in range(major_count)]
+                self._x_labels_major = [
+                    self._x_labels[int(
+                        i * (label_count - 1) / (major_count - 1)
+                    )][0] for i in range(major_count)
+                ]
         else:
             self._x_labels_major = self.x_labels_major and list(
-                map(self._x_label_format_if_value, self.x_labels_major)) or []
+                map(self._x_label_format_if_value, self.x_labels_major)
+            ) or []
 
     def _compute_y_labels(self):
         y_pos = compute_scale(
-            self._box.ymin, self._box.ymax, self.logarithmic,
-            self.order_min, self.min_scale, self.max_scale
+            self._box.ymin, self._box.ymax, self.logarithmic, self.order_min,
+            self.min_scale, self.max_scale
         )
         if self.y_labels:
             self._y_labels = []
@@ -872,8 +963,11 @@ class Graph(PublicApi):
 
     def _compute_y_labels_major(self):
         if self.y_labels_major_every:
-            self._y_labels_major = [self._y_labels[i][1] for i in range(
-                0, len(self._y_labels), self.y_labels_major_every)]
+            self._y_labels_major = [
+                self._y_labels[i][1]
+                for i in
+                range(0, len(self._y_labels), self.y_labels_major_every)
+            ]
 
         elif self.y_labels_major_count:
             label_count = len(self._y_labels)
@@ -881,9 +975,11 @@ class Graph(PublicApi):
             if (major_count >= label_count):
                 self._y_labels_major = [label[1] for label in self._y_labels]
             else:
-                self._y_labels_major = [self._y_labels[
-                    int(i * (label_count - 1) / (major_count - 1))][1]
-                    for i in range(major_count)]
+                self._y_labels_major = [
+                    self._y_labels[int(
+                        i * (label_count - 1) / (major_count - 1)
+                    )][1] for i in range(major_count)
+                ]
 
         elif self.y_labels_major:
             self._y_labels_major = list(map(self._adapt, self.y_labels_major))
@@ -902,19 +998,22 @@ class Graph(PublicApi):
         for line in range(x_lines):
             _current_x += (self.width - self.margin_box.x) / squares[0]
             self.svg.node(
-                self.nodes['plot'], 'path',
+                self.nodes['plot'],
+                'path',
                 class_='bg-lines',
-                d='M%s %s L%s %s' % (
-                    _current_x, 0, _current_x,
-                    self.height - self.margin_box.y))
+                d='M%s %s L%s %s' %
+                (_current_x, 0, _current_x, self.height - self.margin_box.y)
+            )
 
         for line in range(y_lines):
             _current_y += (self.height - self.margin_box.y) / squares[1]
             self.svg.node(
-                self.nodes['plot'], 'path',
+                self.nodes['plot'],
+                'path',
                 class_='bg-lines',
-                d='M%s %s L%s %s' % (
-                    0, _current_y, self.width - self.margin_box.x, _current_y))
+                d='M%s %s L%s %s' %
+                (0, _current_y, self.width - self.margin_box.x, _current_y)
+            )
         return ((self.width - self.margin_box.x) / squares[0],
                 (self.height - self.margin_box.y) / squares[1])
 
@@ -938,8 +1037,8 @@ class Graph(PublicApi):
         """Check if there is any data"""
         return any([
             len([
-                v for a in (s[0] if is_list_like(s) else [s])
-                for v in (a if is_list_like(a) else [a])
-                if v is not None])
-            for s in self.raw_series
+                v
+                for a in (s[0] if is_list_like(s) else [s])
+                for v in (a if is_list_like(a) else [a]) if v is not None
+            ]) for s in self.raw_series
         ])

pygal/graph/histogram.py

@@ -29,7 +29,6 @@ from pygal.util import alter, cached_property, decorate
 
 
 class Histogram(Dual, Bar):
-
     """Histogram chart class"""
     _series_margin = 0
 
@@ -41,27 +40,27 @@ class Histogram(Dual, Bar):
     @cached_property
     def _secondary_values(self):
         """Getter for secondary series values (flattened)"""
-        return [val[0]
-                for serie in self.secondary_series
-                for val in serie.values
-                if val[0] is not None]
+        return [
+            val[0] for serie in self.secondary_series for val in serie.values
+            if val[0] is not None
+        ]
 
     @cached_property
     def xvals(self):
         """All x values"""
-        return [val
-                for serie in self.all_series
-                for dval in serie.values
-                for val in dval[1:3]
-                if val is not None]
+        return [
+            val
+            for serie in self.all_series for dval in serie.values
+            for val in dval[1:3] if val is not None
+        ]
 
     @cached_property
     def yvals(self):
         """All y values"""
-        return [val[0]
-                for serie in self.series
-                for val in serie.values
-                if val[0] is not None]
+        return [
+            val[0] for serie in self.series for val in serie.values
+            if val[0] is not None
+        ]
 
     def _bar(self, serie, parent, x0, x1, y, i, zero, secondary=False):
         """Internal bar drawing function"""
@@ -74,10 +73,19 @@ class Histogram(Dual, Bar):
         width -= 2 * series_margin
 
         r = serie.rounded_bars * 1 if serie.rounded_bars else 0
-        alter(self.svg.transposable_node(
-            parent, 'rect',
-            x=x, y=y, rx=r, ry=r, width=width, height=height,
-            class_='rect reactive tooltip-trigger'), serie.metadata.get(i))
+        alter(
+            self.svg.transposable_node(
+                parent,
+                'rect',
+                x=x,
+                y=y,
+                rx=r,
+                ry=r,
+                width=width,
+                height=height,
+                class_='rect reactive tooltip-trigger'
+            ), serie.metadata.get(i)
+        )
         return x, y, width, height
 
     def bar(self, serie, rescale=False):
@@ -92,15 +100,16 @@ class Histogram(Dual, Bar):
             metadata = serie.metadata.get(i)
 
             bar = decorate(
-                self.svg,
-                self.svg.node(bars, class_='histbar'),
-                metadata)
+                self.svg, self.svg.node(bars, class_='histbar'), metadata
+            )
             val = self._format(serie, i)
 
             bounds = self._bar(
-                serie, bar, x0, x1, y, i, self.zero, secondary=rescale)
+                serie, bar, x0, x1, y, i, self.zero, secondary=rescale
+            )
             self._tooltip_and_print_values(
-                serie_node, serie, bar, i, val, metadata, *bounds)
+                serie_node, serie, bar, i, val, metadata, *bounds
+            )
 
     def _compute(self):
         """Compute x/y min and max and x/y scale and set labels"""

pygal/graph/horizontal.py

@@ -23,7 +23,6 @@ from pygal.view import HorizontalLogView, HorizontalView
 
 
 class HorizontalGraph(Graph):
-
     """Horizontal graph mixin"""
 
     def __init__(self, *args, **kwargs):
@@ -35,11 +34,14 @@ class HorizontalGraph(Graph):
         """After computations transpose labels"""
         self._x_labels, self._y_labels = self._y_labels, self._x_labels
         self._x_labels_major, self._y_labels_major = (
-            self._y_labels_major, self._x_labels_major)
+            self._y_labels_major, self._x_labels_major
+        )
         self._x_2nd_labels, self._y_2nd_labels = (
-            self._y_2nd_labels, self._x_2nd_labels)
+            self._y_2nd_labels, self._x_2nd_labels
+        )
         self.show_y_guides, self.show_x_guides = (
-            self.show_x_guides, self.show_y_guides)
+            self.show_x_guides, self.show_y_guides
+        )
 
     def _axes(self):
         """Set the _force_vertical flag when rendering axes"""
@@ -55,9 +57,9 @@ class HorizontalGraph(Graph):
             view_class = HorizontalView
 
         self.view = view_class(
-            self.width - self.margin_box.x,
-            self.height - self.margin_box.y,
-            self._box)
+            self.width - self.margin_box.x, self.height - self.margin_box.y,
+            self._box
+        )
 
     def _get_x_label(self, i):
         """Convenience function to get the x_label of a value index"""

pygal/graph/horizontalbar.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Horizontal bar graph"""
 
 from pygal.graph.bar import Bar
@@ -24,7 +23,6 @@ from pygal.graph.horizontal import HorizontalGraph
 
 
 class HorizontalBar(HorizontalGraph, Bar):
-
     """Horizontal Bar graph"""
 
     def _plot(self):

pygal/graph/horizontalline.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Horizontal line graph"""
 
 from pygal.graph.horizontal import HorizontalGraph
@@ -24,7 +23,6 @@ from pygal.graph.line import Line
 
 
 class HorizontalLine(HorizontalGraph, Line):
-
     """Horizontal Line graph"""
 
     def _plot(self):

pygal/graph/horizontalstackedbar.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Horizontal stacked graph"""
 
 from pygal.graph.horizontal import HorizontalGraph
@@ -24,5 +23,4 @@ from pygal.graph.stackedbar import StackedBar
 
 
 class HorizontalStackedBar(HorizontalGraph, StackedBar):
-
     """Horizontal Stacked Bar graph"""

pygal/graph/horizontalstackedline.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Horizontal Stacked Line graph"""
 
 from pygal.graph.horizontal import HorizontalGraph
@@ -24,7 +23,6 @@ from pygal.graph.stackedline import StackedLine
 
 
 class HorizontalStackedLine(HorizontalGraph, StackedLine):
-
     """Horizontal Stacked Line graph"""
 
     def _plot(self):

pygal/graph/line.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Line chart: Display series of data as markers (dots)
 connected by straight segments
@@ -29,7 +28,6 @@ from pygal.util import alter, cached_property, decorate
 
 
 class Line(Graph):
-
     """Line graph class"""
 
     def __init__(self, *args, **kwargs):
@@ -42,20 +40,20 @@ class Line(Graph):
         """Getter for series values (flattened)"""
         return [
             val[1]
-            for serie in self.series
-            for val in (serie.interpolated
-                        if self.interpolate else serie.points)
-            if val[1] is not None and (not self.logarithmic or val[1] > 0)]
+            for serie in self.series for val in
+            (serie.interpolated if self.interpolate else serie.points)
+            if val[1] is not None and (not self.logarithmic or val[1] > 0)
+        ]
 
     @cached_property
     def _secondary_values(self):
         """Getter for secondary series values (flattened)"""
         return [
             val[1]
-            for serie in self.secondary_series
-            for val in (serie.interpolated
-                        if self.interpolate else serie.points)
-            if val[1] is not None and (not self.logarithmic or val[1] > 0)]
+            for serie in self.secondary_series for val in
+            (serie.interpolated if self.interpolate else serie.points)
+            if val[1] is not None and (not self.logarithmic or val[1] > 0)
+        ]
 
     def _fill(self, values):
         """Add extra values to fill the line"""
@@ -80,12 +78,12 @@ class Line(Graph):
                     "Invalid value ({}) for config key "
                     "'missing_value_fill_truncation';"
                     " Use 'x', 'y' or 'either'".format(
-                        self.missing_value_fill_truncation))
+                        self.missing_value_fill_truncation
+                    )
+                )
             end -= 1
 
-        return ([(values[0][0], zero)] +
-                values +
-                [(values[end][0], zero)])
+        return ([(values[0][0], zero)] + values + [(values[end][0], zero)])
 
     def line(self, serie, rescale=False):
         """Draw the line serie"""
@@ -102,9 +100,9 @@ class Line(Graph):
                 if self.logarithmic:
                     if points[i][1] is None or points[i][1] <= 0:
                         continue
-                if (serie.show_only_major_dots and
-                        self.x_labels and i < len(self.x_labels) and
-                        self.x_labels[i] not in self._x_labels_major):
+                if (serie.show_only_major_dots and self.x_labels
+                        and i < len(self.x_labels)
+                        and self.x_labels[i] not in self._x_labels_major):
                     continue
 
                 metadata = serie.metadata.get(i)
@@ -116,25 +114,33 @@ class Line(Graph):
                 classes = ' '.join(classes)
 
                 self._confidence_interval(
-                    serie_node['overlay'], x, y, serie.values[i], metadata)
+                    serie_node['overlay'], x, y, serie.values[i], metadata
+                )
 
                 dots = decorate(
                     self.svg,
                     self.svg.node(serie_node['overlay'], class_="dots"),
-                    metadata)
+                    metadata
+                )
 
                 val = self._format(serie, i)
-                alter(self.svg.transposable_node(
-                    dots, 'circle', cx=x, cy=y, r=serie.dots_size,
-                    class_='dot reactive tooltip-trigger'), metadata)
+                alter(
+                    self.svg.transposable_node(
+                        dots,
+                        'circle',
+                        cx=x,
+                        cy=y,
+                        r=serie.dots_size,
+                        class_='dot reactive tooltip-trigger'
+                    ), metadata
+                )
                 self._tooltip_data(
-                    dots, val, x, y,
-                    xlabel=self._get_x_label(i))
+                    dots, val, x, y, xlabel=self._get_x_label(i)
+                )
                 self._static_value(
-                    serie_node, val,
-                    x + self.style.value_font_size,
-                    y + self.style.value_font_size,
-                    metadata)
+                    serie_node, val, x + self.style.value_font_size,
+                    y + self.style.value_font_size, metadata
+                )
 
         if serie.stroke:
             if self.interpolate:
@@ -157,12 +163,12 @@ class Line(Graph):
                         # emit current subsequence
                         sequences.append(cur_sequence)
                         cur_sequence = []
-                    elif y is None:       # just discard
+                    elif y is None:  # just discard
                         continue
                     else:
-                        cur_sequence.append((x, y))   # append the element
+                        cur_sequence.append((x, y))  # append the element
 
-                if len(cur_sequence) > 0:      # emit last possible sequence
+                if len(cur_sequence) > 0:  # emit last possible sequence
                     sequences.append(cur_sequence)
             else:
                 # plain vanilla rendering
@@ -175,9 +181,12 @@ class Line(Graph):
                             del seq[seq.index(ele)]
             for seq in sequences:
                 self.svg.line(
-                    serie_node['plot'], seq, close=self._self_close,
+                    serie_node['plot'],
+                    seq,
+                    close=self._self_close,
                     class_='line reactive' +
-                           (' nofill' if not serie.fill else ''))
+                    (' nofill' if not serie.fill else '')
+                )
 
     def _compute(self):
         """Compute y min and max and y scale and set labels"""

pygal/graph/map.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 pygal contains no map but a base class to create extension
 see the pygal_maps_world package to get an exemple.
@@ -31,7 +30,6 @@ from pygal.util import alter, cached_property, cut, decorate
 
 
 class BaseMap(Graph):
-
     """Base class for maps"""
 
     _dual = True
@@ -39,10 +37,10 @@ class BaseMap(Graph):
     @cached_property
     def _values(self):
         """Getter for series values (flattened)"""
-        return [val[1]
-                for serie in self.series
-                for val in serie.values
-                if val[1] is not None]
+        return [
+            val[1] for serie in self.series for val in serie.values
+            if val[1] is not None
+        ]
 
     def enumerate_values(self, serie):
         """Hook to replace default enumeration on values"""
@@ -58,7 +56,8 @@ class BaseMap(Graph):
         """
         return '%s: %s' % (
             self.area_names.get(self.adapt_code(value[0]), '?'),
-            self._y_format(value[1]))
+            self._y_format(value[1])
+        )
 
     def _plot(self):
         """Insert a map in the chart and apply data on it"""
@@ -67,8 +66,9 @@ class BaseMap(Graph):
         map.set('height', str(self.view.height))
 
         for i, serie in enumerate(self.series):
-            safe_vals = list(filter(
-                lambda x: x is not None, cut(serie.values, 1)))
+            safe_vals = list(
+                filter(lambda x: x is not None, cut(serie.values, 1))
+            )
             if not safe_vals:
                 continue
             min_ = min(safe_vals)
@@ -83,9 +83,9 @@ class BaseMap(Graph):
                     ratio = .3 + .7 * (value - min_) / (max_ - min_)
 
                 areae = map.findall(
-                    ".//*[@class='%s%s %s map-element']" % (
-                        self.area_prefix, area_code,
-                        self.kind))
+                    ".//*[@class='%s%s %s map-element']" %
+                    (self.area_prefix, area_code, self.kind)
+                )
 
                 if not areae:
                     continue

pygal/graph/pie.py

@@ -31,7 +31,6 @@ from pygal.util import alter, decorate
 
 
 class Pie(Graph):
-
     """Pie graph class"""
 
     _adapters = [positive, none_to_zero]
@@ -62,9 +61,8 @@ class Pie(Graph):
             val = self._format(serie, i)
             metadata = serie.metadata.get(i)
             slice_ = decorate(
-                self.svg,
-                self.svg.node(slices, class_="slice"),
-                metadata)
+                self.svg, self.svg.node(slices, class_="slice"), metadata
+            )
             if dual:
                 small_radius = radius * .9
                 big_radius = radius
@@ -72,17 +70,21 @@ class Pie(Graph):
                 big_radius = radius * .9
                 small_radius = radius * serie.inner_radius
 
-            alter(self.svg.slice(
-                serie_node, slice_, big_radius, small_radius,
-                angle, start_angle, center, val, i, metadata), metadata)
+            alter(
+                self.svg.slice(
+                    serie_node, slice_, big_radius, small_radius, angle,
+                    start_angle, center, val, i, metadata
+                ), metadata
+            )
             start_angle += angle
 
         if dual:
             val = self._serie_format(serie, sum(serie.values))
-            self.svg.slice(serie_node,
-                           self.svg.node(slices, class_="big_slice"),
-                           radius * .9, 0, serie_angle,
-                           original_start_angle, center, val, i, metadata)
+            self.svg.slice(
+                serie_node, self.svg.node(slices,
+                                          class_="big_slice"), radius * .9, 0,
+                serie_angle, original_start_angle, center, val, i, metadata
+            )
         return serie_angle
 
     def _compute_x_labels(self):

pygal/graph/public.py

@@ -26,7 +26,6 @@ from pygal.graph.base import BaseGraph
 
 
 class PublicApi(BaseGraph):
-
     """Chart public functions"""
 
     def add(self, title, values, **kwargs):
@@ -51,7 +50,8 @@ class PublicApi(BaseGraph):
         """Render the graph, and return the svg string"""
         self.setup(**kwargs)
         svg = self.svg.render(
-            is_unicode=is_unicode, pretty_print=self.pretty_print)
+            is_unicode=is_unicode, pretty_print=self.pretty_print
+        )
         self.teardown()
         return svg
 
@@ -96,16 +96,16 @@ class PublicApi(BaseGraph):
         """Render the graph, and return a Django response"""
         from django.http import HttpResponse
         return HttpResponse(
-            self.render(**kwargs), content_type='image/svg+xml')
+            self.render(**kwargs), content_type='image/svg+xml'
+        )
 
     def render_data_uri(self, **kwargs):
         """Output a base 64 encoded data uri"""
         # Force protocol as data uri have none
         kwargs.setdefault('force_uri_protocol', 'https')
         return "data:image/svg+xml;charset=utf-8;base64,%s" % (
-            base64.b64encode(
-                self.render(**kwargs)
-            ).decode('utf-8').replace('\n', '')
+            base64.b64encode(self.render(**kwargs)
+                             ).decode('utf-8').replace('\n', '')
         )
 
     def render_to_file(self, filename, **kwargs):
@@ -117,7 +117,8 @@ class PublicApi(BaseGraph):
         """Render the graph, convert it to png and write it to filename"""
         import cairosvg
         return cairosvg.svg2png(
-            bytestring=self.render(**kwargs), write_to=filename, dpi=dpi)
+            bytestring=self.render(**kwargs), write_to=filename, dpi=dpi
+        )
 
     def render_sparktext(self, relative_to=None):
         """Make a mini text sparkline from chart"""
@@ -141,8 +142,9 @@ class PublicApi(BaseGraph):
 
         divisions = len(bars) - 1
         for value in values:
-            chart += bars[int(divisions *
-                              (value - relative_to) / (vmax - relative_to))]
+            chart += bars[int(
+                divisions * (value - relative_to) / (vmax - relative_to)
+            )]
         return chart
 
     def render_sparkline(self, **kwargs):

pygal/graph/pyramid.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Pyramid chart: Stacked bar chart containing only positive values divided by two
 axes, generally gender for age pyramid.
@@ -30,7 +29,6 @@ from pygal.graph.stackedbar import StackedBar
 
 
 class VerticalPyramid(StackedBar):
-
     """Vertical Pyramid graph class"""
 
     _adapters = [positive]
@@ -42,26 +40,37 @@ class VerticalPyramid(StackedBar):
     def _get_separated_values(self, secondary=False):
         """Separate values between odd and even series stacked"""
         series = self.secondary_series if secondary else self.series
-        positive_vals = map(sum, zip(
-            *[serie.safe_values
-              for index, serie in enumerate(series)
-              if index % 2]))
-        negative_vals = map(sum, zip(
-            *[serie.safe_values
-              for index, serie in enumerate(series)
-              if not index % 2]))
+        positive_vals = map(
+            sum,
+            zip(
+                *[
+                    serie.safe_values for index, serie in enumerate(series)
+                    if index % 2
+                ]
+            )
+        )
+        negative_vals = map(
+            sum,
+            zip(
+                *[
+                    serie.safe_values for index, serie in enumerate(series)
+                    if not index % 2
+                ]
+            )
+        )
         return list(positive_vals), list(negative_vals)
 
     def _compute_box(self, positive_vals, negative_vals):
         """Compute Y min and max"""
         max_ = max(
             max(positive_vals or [self.zero]),
-            max(negative_vals or [self.zero]))
+            max(negative_vals or [self.zero])
+        )
 
         if self.range and self.range[0] is not None:
             self._box.ymin = self.range[0]
         else:
-            self._box.ymin = - max_
+            self._box.ymin = -max_
 
         if self.range and self.range[1] is not None:
             self._box.ymax = self.range[1]
@@ -71,16 +80,15 @@ class VerticalPyramid(StackedBar):
     def _pre_compute_secondary(self, positive_vals, negative_vals):
         """Compute secondary y min and max"""
         self._secondary_max = max(max(positive_vals), max(negative_vals))
-        self._secondary_min = - self._secondary_max
+        self._secondary_min = -self._secondary_max
 
     def _bar(self, serie, parent, x, y, i, zero, secondary=False):
         """Internal stacking bar drawing function"""
         if serie.index % 2:
             y = -y
-        return super(VerticalPyramid, self)._bar(
-            serie, parent, x, y, i, zero, secondary)
+        return super(VerticalPyramid,
+                     self)._bar(serie, parent, x, y, i, zero, secondary)
 
 
 class Pyramid(HorizontalGraph, VerticalPyramid):
-
     """Horizontal Pyramid graph class like the one used by age pyramid"""

pygal/graph/radar.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Radar chart: As known as kiviat chart or spider chart is a polar line chart
 useful for multivariate observation.
@@ -34,7 +33,6 @@ from pygal.view import PolarLogView, PolarView
 
 
 class Radar(Line):
-
     """Rada graph class"""
 
     _adapters = [positive, none_to_zero]
@@ -52,8 +50,9 @@ class Radar(Line):
     def _values(self):
         """Getter for series values (flattened)"""
         if self.interpolate:
-            return [val[0] for serie in self.series
-                    for val in serie.interpolated]
+            return [
+                val[0] for serie in self.series for val in serie.interpolated
+            ]
         else:
             return super(Line, self)._values
 
@@ -65,18 +64,20 @@ class Radar(Line):
             view_class = PolarView
 
         self.view = view_class(
-            self.width - self.margin_box.x,
-            self.height - self.margin_box.y,
-            self._box)
+            self.width - self.margin_box.x, self.height - self.margin_box.y,
+            self._box
+        )
 
     def _x_axis(self, draw_axes=True):
         """Override x axis to make it polar"""
         if not self._x_labels or not self.show_x_labels:
             return
 
-        axis = self.svg.node(self.nodes['plot'], class_="axis x web%s" % (
-            ' always_show' if self.show_x_guides else ''
-        ))
+        axis = self.svg.node(
+            self.nodes['plot'],
+            class_="axis x web%s" %
+            (' always_show' if self.show_x_guides else '')
+        )
         format_ = lambda x: '%f %f' % x
         center = self.view((0, 0))
         r = self._rmax
@@ -92,32 +93,37 @@ class Radar(Line):
             end = self.view((r, theta))
 
             self.svg.node(
-                guides, 'path',
+                guides,
+                'path',
                 d='M%s L%s' % (format_(center), format_(end)),
-                class_='%s%sline' % (
-                    'axis ' if label == "0" else '',
-                    'major ' if major else ''))
+                class_='%s%sline' %
+                ('axis ' if label == "0" else '', 'major ' if major else '')
+            )
 
             r_txt = (1 - self._box.__class__.margin) * self._box.ymax
             pos_text = self.view((r_txt, theta))
             text = self.svg.node(
-                guides, 'text',
+                guides,
+                'text',
                 x=pos_text[0],
                 y=pos_text[1],
-                class_='major' if major else '')
+                class_='major' if major else ''
+            )
             text.text = truncate(label, truncation)
             if text.text != label:
                 self.svg.node(guides, 'title').text = label
             else:
                 self.svg.node(
-                    guides, 'title',
+                    guides,
+                    'title',
                 ).text = self._x_format(theta)
 
-            angle = - theta + pi / 2
+            angle = -theta + pi / 2
             if cos(angle) < 0:
                 angle -= pi
             text.attrib['transform'] = 'rotate(%f %s)' % (
-                self.x_label_rotation or deg(angle), format_(pos_text))
+                self.x_label_rotation or deg(angle), format_(pos_text)
+            )
 
     def _y_axis(self, draw_axes=True):
         """Override y axis to make it polar"""
@@ -130,31 +136,32 @@ class Radar(Line):
             major = r in self._y_labels_major
             if not (self.show_minor_y_labels or major):
                 continue
-            guides = self.svg.node(axis, class_='%sguides' % (
-                'logarithmic ' if self.logarithmic else ''
-            ))
+            guides = self.svg.node(
+                axis,
+                class_='%sguides' %
+                ('logarithmic ' if self.logarithmic else '')
+            )
             if self.show_y_guides:
                 self.svg.line(
                     guides, [self.view((r, theta)) for theta in self._x_pos],
                     close=True,
-                    class_='%sguide line' % (
-                        'major ' if major else ''))
+                    class_='%sguide line' % ('major ' if major else '')
+                )
             x, y = self.view((r, self._x_pos[0]))
             x -= 5
             text = self.svg.node(
-                guides, 'text',
-                x=x,
-                y=y,
-                class_='major' if major else ''
+                guides, 'text', x=x, y=y, class_='major' if major else ''
             )
             text.text = label
 
             if self.y_label_rotation:
                 text.attrib['transform'] = "rotate(%d %f %f)" % (
-                    self.y_label_rotation, x, y)
+                    self.y_label_rotation, x, y
+                )
 
             self.svg.node(
-                guides, 'title',
+                guides,
+                'title',
             ).text = self._y_format(r)
 
     def _compute(self):
@@ -162,19 +169,20 @@ class Radar(Line):
         delta = 2 * pi / self._len if self._len else 0
         self._x_pos = [.5 * pi + i * delta for i in range(self._len + 1)]
         for serie in self.all_series:
-            serie.points = [
-                (v, self._x_pos[i])
-                for i, v in enumerate(serie.values)]
+            serie.points = [(v, self._x_pos[i])
+                            for i, v in enumerate(serie.values)]
             if self.interpolate:
-                extended_x_pos = (
-                    [.5 * pi - delta] + self._x_pos)
-                extended_vals = (serie.values[-1:] +
-                                 serie.values)
+                extended_x_pos = ([.5 * pi - delta] + self._x_pos)
+                extended_vals = (serie.values[-1:] + serie.values)
                 serie.interpolated = list(
-                    map(tuple,
-                        map(reversed,
-                            self._interpolate(
-                                extended_x_pos, extended_vals))))
+                    map(
+                        tuple,
+                        map(
+                            reversed,
+                            self._interpolate(extended_x_pos, extended_vals)
+                        )
+                    )
+                )
 
         # x labels space
         self._box.margin *= 2

pygal/graph/solidgauge.py

@@ -16,8 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
-
 """
 Solid Guage
 For each series a solid guage is shown on the plot area.
@@ -31,24 +29,21 @@ from pygal.util import alter, decorate
 
 
 class SolidGauge(Graph):
-
     def gaugify(self, serie, squares, sq_dimensions, current_square):
         serie_node = self.svg.serie(serie)
         if self.half_pie:
             start_angle = 3 * pi / 2
-            center = (
-                (current_square[1] * sq_dimensions[0]) - (
-                    sq_dimensions[0] / 2.),
-                (current_square[0] * sq_dimensions[1]) - (
-                    sq_dimensions[1] / 4))
+            center = ((current_square[1] * sq_dimensions[0]) -
+                      (sq_dimensions[0] / 2.),
+                      (current_square[0] * sq_dimensions[1]) -
+                      (sq_dimensions[1] / 4))
             end_angle = pi / 2
         else:
             start_angle = 0
-            center = (
-                (current_square[1] * sq_dimensions[0]) - (
-                    sq_dimensions[0] / 2.),
-                (current_square[0] * sq_dimensions[1]) - (
-                    sq_dimensions[1] / 2.))
+            center = ((current_square[1] * sq_dimensions[0]) -
+                      (sq_dimensions[0] / 2.),
+                      (current_square[0] * sq_dimensions[1]) -
+                      (sq_dimensions[1] / 2.))
             end_angle = 2 * pi
 
         max_value = serie.metadata.get(0, {}).get('max_value', 100)
@@ -57,7 +52,8 @@ class SolidGauge(Graph):
 
         self.svg.gauge_background(
             serie_node, start_angle, center, radius, small_radius, end_angle,
-            self.half_pie, self._serie_format(serie, max_value))
+            self.half_pie, self._serie_format(serie, max_value)
+        )
 
         sum_ = 0
         for i, value in enumerate(serie.values):
@@ -73,27 +69,30 @@ class SolidGauge(Graph):
             metadata = serie.metadata.get(i)
 
             gauge_ = decorate(
-                self.svg,
-                self.svg.node(serie_node['plot'], class_="gauge"),
-                metadata)
+                self.svg, self.svg.node(serie_node['plot'], class_="gauge"),
+                metadata
+            )
 
             alter(
                 self.svg.solid_gauge(
-                    serie_node, gauge_, radius, small_radius,
-                    angle, start_angle, center, val, i, metadata,
-                    self.half_pie, end_angle,
-                    self._serie_format(serie, max_value)),
-                metadata)
+                    serie_node, gauge_, radius, small_radius, angle,
+                    start_angle, center, val, i, metadata, self.half_pie,
+                    end_angle, self._serie_format(serie, max_value)
+                ), metadata
+            )
             start_angle += angle
             sum_ += value
 
         x, y = center
         self.svg.node(
-            serie_node['text_overlay'], 'text',
+            serie_node['text_overlay'],
+            'text',
             class_='value gauge-sum',
             x=x,
             y=y + self.style.value_font_size / 3,
-            attrib={'text-anchor': 'middle'}
+            attrib={
+                'text-anchor': 'middle'
+            }
         ).text = self._serie_format(serie, sum_)
 
     def _compute_x_labels(self):
@@ -109,8 +108,7 @@ class SolidGauge(Graph):
 
         for index, serie in enumerate(self.series):
             current_square = self._current_square(squares, index)
-            self.gaugify(
-                serie, squares, sq_dimensions, current_square)
+            self.gaugify(serie, squares, sq_dimensions, current_square)
 
     def _squares(self):
 
@@ -150,4 +148,5 @@ class SolidGauge(Graph):
             else:
                 return tuple(current_square)
         raise Exception(
-            'Something went wrong with the current square assignment.')
+            'Something went wrong with the current square assignment.'
+        )

pygal/graph/stackedbar.py

@@ -28,7 +28,6 @@ from pygal.graph.bar import Bar
 
 
 class StackedBar(Bar):
-
     """Stacked Bar graph class"""
 
     _adapters = [none_to_zero]
@@ -37,15 +36,14 @@ class StackedBar(Bar):
         """Separate values between positives and negatives stacked"""
         series = self.secondary_series if secondary else self.series
         transposed = list(zip(*[serie.values for serie in series]))
-        positive_vals = [sum([
-            val for val in vals
-            if val is not None and val >= self.zero])
-            for vals in transposed]
-        negative_vals = [sum([
-            val
-            for val in vals
-            if val is not None and val < self.zero])
-            for vals in transposed]
+        positive_vals = [
+            sum([val for val in vals if val is not None and val >= self.zero])
+            for vals in transposed
+        ]
+        negative_vals = [
+            sum([val for val in vals if val is not None and val < self.zero])
+            for vals in transposed
+        ]
         return positive_vals, negative_vals
 
     def _compute_box(self, positive_vals, negative_vals):
@@ -54,22 +52,26 @@ class StackedBar(Bar):
             self._box.ymin = self.range[0]
         else:
             self._box.ymin = negative_vals and min(
-                min(negative_vals), self.zero) or self.zero
+                min(negative_vals), self.zero
+            ) or self.zero
         if self.range and self.range[1] is not None:
             self._box.ymax = self.range[1]
         else:
             self._box.ymax = positive_vals and max(
-                max(positive_vals), self.zero) or self.zero
+                max(positive_vals), self.zero
+            ) or self.zero
 
     def _compute(self):
         """Compute y min and max and y scale and set labels"""
         positive_vals, negative_vals = self._get_separated_values()
 
         if self.logarithmic:
-            positive_vals = list(filter(
-                lambda x: x > self.zero, positive_vals))
-            negative_vals = list(filter(
-                lambda x: x > self.zero, negative_vals))
+            positive_vals = list(
+                filter(lambda x: x > self.zero, positive_vals)
+            )
+            negative_vals = list(
+                filter(lambda x: x > self.zero, negative_vals)
+            )
 
         self._compute_box(positive_vals, negative_vals)
         positive_vals = positive_vals or [self.zero]
@@ -96,21 +98,25 @@ class StackedBar(Bar):
 
     def _pre_compute_secondary(self, positive_vals, negative_vals):
         """Compute secondary y min and max"""
-        self._secondary_min = (negative_vals and min(
-            min(negative_vals), self.zero)) or self.zero
-        self._secondary_max = (positive_vals and max(
-            max(positive_vals), self.zero)) or self.zero
+        self._secondary_min = (
+            negative_vals and min(min(negative_vals), self.zero)
+        ) or self.zero
+        self._secondary_max = (
+            positive_vals and max(max(positive_vals), self.zero)
+        ) or self.zero
 
     def _bar(self, serie, parent, x, y, i, zero, secondary=False):
         """Internal stacking bar drawing function"""
         if secondary:
-            cumulation = (self.secondary_negative_cumulation
-                          if y < self.zero else
-                          self.secondary_positive_cumulation)
+            cumulation = (
+                self.secondary_negative_cumulation
+                if y < self.zero else self.secondary_positive_cumulation
+            )
         else:
-            cumulation = (self.negative_cumulation
-                          if y < self.zero else
-                          self.positive_cumulation)
+            cumulation = (
+                self.negative_cumulation
+                if y < self.zero else self.positive_cumulation
+            )
         zero = cumulation[i]
         cumulation[i] = zero + y
         if zero == 0:
@@ -133,9 +139,16 @@ class StackedBar(Bar):
         height = self.view.y(zero) - y
         r = serie.rounded_bars * 1 if serie.rounded_bars else 0
         self.svg.transposable_node(
-            parent, 'rect',
-            x=x, y=y, rx=r, ry=r, width=width, height=height,
-            class_='rect reactive tooltip-trigger')
+            parent,
+            'rect',
+            x=x,
+            y=y,
+            rx=r,
+            ry=r,
+            width=width,
+            height=height,
+            class_='rect reactive tooltip-trigger'
+        )
         return x, y, width, height
 
     def _plot(self):

pygal/graph/stackedline.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 Stacked Line chart: Like a line chart but with all lines stacking
 on top of the others. Used along fill=True option.
@@ -29,7 +28,6 @@ from pygal.graph.line import Line
 
 
 class StackedLine(Line):
-
     """Stacked Line graph class"""
 
     _adapters = [none_to_zero]
@@ -45,15 +43,11 @@ class StackedLine(Line):
         """
         sum_ = serie.points[index][1]
         if serie in self.series and (
-                self.stack_from_top and
-                self.series.index(serie) == self._order - 1 or
-                not self.stack_from_top and
-                self.series.index(serie) == 0):
+                self.stack_from_top
+                and self.series.index(serie) == self._order - 1
+                or not self.stack_from_top and self.series.index(serie) == 0):
             return super(StackedLine, self)._value_format(value)
-        return '%s (+%s)' % (
-            self._y_format(sum_),
-            self._y_format(value)
-        )
+        return '%s (+%s)' % (self._y_format(sum_), self._y_format(value))
 
     def _fill(self, values):
         """Add extra values to fill the line"""
@@ -73,9 +67,8 @@ class StackedLine(Line):
             accumulation = [0] * self._len
             for serie in series_group[::-1 if self.stack_from_top else 1]:
                 accumulation = list(map(sum, zip(accumulation, serie.values)))
-                serie.points = [
-                    (x_pos[i], v)
-                    for i, v in enumerate(accumulation)]
+                serie.points = [(x_pos[i], v)
+                                for i, v in enumerate(accumulation)]
                 if serie.points and self.interpolate:
                     serie.interpolated = self._interpolate(x_pos, accumulation)
                 else:

pygal/graph/time.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 XY time extensions: handle convertion of date, time, datetime, timedelta
 into float for xy plot and back to their type for display
@@ -67,21 +66,20 @@ def timedelta_to_seconds(x):
 def time_to_seconds(x):
     """Convert a time in a seconds sum"""
     if isinstance(x, time):
-        return ((
-            ((x.hour * 60) + x.minute) * 60 + x.second
-        ) * 10 ** 6 + x.microsecond) / 10 ** 6
+        return ((((x.hour * 60) + x.minute) * 60 + x.second) * 10**6 +
+                x.microsecond) / 10**6
 
     if is_str(x):
         return x
     # Clamp to valid time
-    return x and max(0, min(x, 24 * 3600 - 10 ** -6))
+    return x and max(0, min(x, 24 * 3600 - 10**-6))
 
 
 def seconds_to_time(x):
     """Convert a number of second into a time"""
-    t = int(x * 10 ** 6)
-    ms = t % 10 ** 6
-    t = t // 10 ** 6
+    t = int(x * 10**6)
+    ms = t % 10**6
+    t = t // 10**6
     s = t % 60
     t = t // 60
     m = t % 60
@@ -91,7 +89,6 @@ def seconds_to_time(x):
 
 
 class DateTimeLine(XY):
-
     """DateTime abscissa xy graph class"""
 
     _x_adapters = [datetime_to_timestamp, date_to_datetime]
@@ -99,27 +96,29 @@ class DateTimeLine(XY):
     @property
     def _x_format(self):
         """Return the value formatter for this graph"""
+
         def datetime_to_str(x):
             dt = datetime.utcfromtimestamp(x)
             return self.x_value_formatter(dt)
+
         return datetime_to_str
 
 
 class DateLine(DateTimeLine):
-
     """Date abscissa xy graph class"""
 
     @property
     def _x_format(self):
         """Return the value formatter for this graph"""
+
         def date_to_str(x):
             d = datetime.utcfromtimestamp(x).date()
             return self.x_value_formatter(d)
+
         return date_to_str
 
 
 class TimeLine(DateTimeLine):
-
     """Time abscissa xy graph class"""
 
     _x_adapters = [positive, time_to_seconds, datetime_to_time]
@@ -127,14 +126,15 @@ class TimeLine(DateTimeLine):
     @property
     def _x_format(self):
         """Return the value formatter for this graph"""
+
         def date_to_str(x):
             t = seconds_to_time(x)
             return self.x_value_formatter(t)
+
         return date_to_str
 
 
 class TimeDeltaLine(XY):
-
     """TimeDelta abscissa xy graph class"""
 
     _x_adapters = [timedelta_to_seconds]
@@ -142,6 +142,7 @@ class TimeDeltaLine(XY):
     @property
     def _x_format(self):
         """Return the value formatter for this graph"""
+
         def timedelta_to_str(x):
             td = timedelta(seconds=x)
             return self.x_value_formatter(td)

pygal/graph/treemap.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Treemap chart: Visualize data using nested recangles"""
 
 from __future__ import division
@@ -27,7 +26,6 @@ from pygal.util import alter, cut, decorate
 
 
 class Treemap(Graph):
-
     """Treemap graph class"""
 
     _adapters = [positive, none_to_zero]
@@ -43,31 +41,26 @@ class Treemap(Graph):
         val = self._format(serie, i)
 
         rect = decorate(
-            self.svg,
-            self.svg.node(rects, class_="rect"),
-            metadata)
+            self.svg, self.svg.node(rects, class_="rect"), metadata
+        )
 
         alter(
             self.svg.node(
-                rect, 'rect',
+                rect,
+                'rect',
                 x=rx,
                 y=ry,
                 width=rw,
                 height=rh,
-                class_='rect reactive tooltip-trigger'),
-            metadata)
+                class_='rect reactive tooltip-trigger'
+            ), metadata
+        )
 
         self._tooltip_data(
-            rect, val,
-            rx + rw / 2,
-            ry + rh / 2,
-            'centered',
-            self._get_x_label(i))
-        self._static_value(
-            serie_node, val,
-            rx + rw / 2,
-            ry + rh / 2,
-            metadata)
+            rect, val, rx + rw / 2, ry + rh / 2, 'centered',
+            self._get_x_label(i)
+        )
+        self._static_value(serie_node, val, rx + rw / 2, ry + rh / 2, metadata)
 
     def _binary_tree(self, data, total, x, y, w, h, parent=None):
         if total == 0:
@@ -81,10 +74,11 @@ class Treemap(Graph):
                 datum = data[0]
                 serie_node = self.svg.serie(datum)
                 self._binary_tree(
-                    list(enumerate(datum.values)),
-                    total, x, y, w, h,
-                    (datum, serie_node,
-                     self.svg.node(serie_node['plot'], class_="rects")))
+                    list(enumerate(datum.values)), total, x, y, w, h, (
+                        datum, serie_node,
+                        self.svg.node(serie_node['plot'], class_="rects")
+                    )
+                )
             return
 
         midpoint = total / 2
@@ -110,16 +104,16 @@ class Treemap(Graph):
 
         if h > w:
             y_pivot = pivot_pct * h
+            self._binary_tree(half1, half1_sum, x, y, w, y_pivot, parent)
             self._binary_tree(
-                half1, half1_sum, x, y, w, y_pivot, parent)
-            self._binary_tree(
-                half2, half2_sum, x, y + y_pivot, w, h - y_pivot, parent)
+                half2, half2_sum, x, y + y_pivot, w, h - y_pivot, parent
+            )
         else:
             x_pivot = pivot_pct * w
+            self._binary_tree(half1, half1_sum, x, y, x_pivot, h, parent)
             self._binary_tree(
-                half1, half1_sum, x, y, x_pivot, h, parent)
-            self._binary_tree(
-                half2, half2_sum, x + x_pivot, y, w - x_pivot, h, parent)
+                half2, half2_sum, x + x_pivot, y, w - x_pivot, h, parent
+            )
 
     def _compute_x_labels(self):
         pass
@@ -136,7 +130,7 @@ class Treemap(Graph):
         gh = self.height - self.margin_box.y
 
         self.view.box.xmin = self.view.box.ymin = x = y = 0
-        self.view.box.xmax = w = (total * gw / gh) ** .5
+        self.view.box.xmax = w = (total * gw / gh)**.5
         self.view.box.ymax = h = total / w
         self.view.box.fix()
 

pygal/graph/xy.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """
 XY Line graph: Plot a set of couple data points (x, y) connected by
 straight segments.
@@ -32,7 +31,6 @@ from pygal.util import cached_property, compose, ident
 
 
 class XY(Line, Dual):
-
     """XY Line graph class"""
 
     _x_adapters = []
@@ -40,38 +38,42 @@ class XY(Line, Dual):
     @cached_property
     def xvals(self):
         """All x values"""
-        return [val[0]
-                for serie in self.all_series
-                for val in serie.values
-                if val[0] is not None]
+        return [
+            val[0] for serie in self.all_series for val in serie.values
+            if val[0] is not None
+        ]
 
     @cached_property
     def yvals(self):
         """All y values"""
-        return [val[1]
-                for serie in self.series
-                for val in serie.values
-                if val[1] is not None]
+        return [
+            val[1] for serie in self.series for val in serie.values
+            if val[1] is not None
+        ]
 
     @cached_property
     def _min(self):
         """Getter for the minimum series value"""
-        return (self.range[0] if (self.range and self.range[0] is not None)
-                else (min(self.yvals) if self.yvals else None))
+        return (
+            self.range[0] if (self.range and self.range[0] is not None) else
+            (min(self.yvals) if self.yvals else None)
+        )
 
     @cached_property
     def _max(self):
         """Getter for the maximum series value"""
-        return (self.range[1] if (self.range and self.range[1] is not None)
-                else (max(self.yvals) if self.yvals else None))
+        return (
+            self.range[1] if (self.range and self.range[1] is not None) else
+            (max(self.yvals) if self.yvals else None)
+        )
 
     def _compute(self):
         """Compute x/y min and max and x/y scale and set labels"""
         if self.xvals:
             if self.xrange:
-                x_adapter = reduce(
-                    compose, self._x_adapters) if getattr(
-                        self, '_x_adapters', None) else ident
+                x_adapter = reduce(compose, self._x_adapters) if getattr(
+                    self, '_x_adapters', None
+                ) else ident
 
                 xmin = x_adapter(self.xrange[0])
                 xmax = x_adapter(self.xrange[1])
@@ -98,18 +100,24 @@ class XY(Line, Dual):
         for serie in self.all_series:
             serie.points = serie.values
             if self.interpolate:
-                vals = list(zip(*sorted(
-                    filter(lambda t: None not in t,
-                           serie.points), key=lambda x: x[0])))
+                vals = list(
+                    zip(
+                        *sorted(
+                            filter(lambda t: None not in t, serie.points),
+                            key=lambda x: x[0]
+                        )
+                    )
+                )
                 serie.interpolated = self._interpolate(vals[0], vals[1])
 
         if self.interpolate:
-            self.xvals = [val[0]
-                          for serie in self.all_series
-                          for val in serie.interpolated]
-            self.yvals = [val[1]
-                          for serie in self.series
-                          for val in serie.interpolated]
+            self.xvals = [
+                val[0] for serie in self.all_series
+                for val in serie.interpolated
+            ]
+            self.yvals = [
+                val[1] for serie in self.series for val in serie.interpolated
+            ]
             if self.xvals:
                 xmin = min(self.xvals)
                 xmax = max(self.xvals)

pygal/interpolate.py

@@ -102,8 +102,9 @@ def cubic_interpolate(x, y, precision=250, **kwargs):
             yield x[i] + X, a[i] + b[i] * X + c[i] * X2 + d[i] * X3
 
 
-def hermite_interpolate(x, y, precision=250,
-                        type='cardinal', c=None, b=None, t=None):
+def hermite_interpolate(
+        x, y, precision=250, type='cardinal', c=None, b=None, t=None
+):
     """
     Interpolate x, y using the hermite method.
     See https://en.wikipedia.org/wiki/Cubic_Hermite_spline
@@ -132,11 +133,9 @@ def hermite_interpolate(x, y, precision=250,
         c = 0
     if type == 'finite_difference':
         for i in range(1, n):
-            m[i] = w[i] = .5 * (
-                (y[i + 1] - y[i]) / (x[i + 1] - x[i]) +
-                (y[i] - y[i - 1]) / (
-                    x[i] - x[i - 1])
-            ) if x[i + 1] - x[i] and x[i] - x[i - 1] else 0
+            m[i] = w[i] = .5 * ((y[i + 1] - y[i]) / (x[i + 1] - x[i]) +
+                                (y[i] - y[i - 1]) / (x[i] - x[i - 1])
+                                ) if x[i + 1] - x[i] and x[i] - x[i - 1] else 0
 
     elif type == 'kochanek_bartels':
         c = c or 0
@@ -151,9 +150,9 @@ def hermite_interpolate(x, y, precision=250,
     if type == 'cardinal':
         c = c or 0
         for i in range(1, n):
-            m[i] = w[i] = (1 - c) * (
-                y[i + 1] - y[i - 1]) / (
-                    x[i + 1] - x[i - 1]) if x[i + 1] - x[i - 1] else 0
+            m[i] = w[i] = (1 - c) * (y[i + 1] - y[i - 1]) / (
+                x[i + 1] - x[i - 1]
+            ) if x[i + 1] - x[i - 1] else 0
 
     def p(i, x_):
         t = (x_ - x[i]) / delta_x[i]
@@ -162,13 +161,13 @@ def hermite_interpolate(x, y, precision=250,
 
         h00 = 2 * t3 - 3 * t2 + 1
         h10 = t3 - 2 * t2 + t
-        h01 = - 2 * t3 + 3 * t2
+        h01 = -2 * t3 + 3 * t2
         h11 = t3 - t2
 
-        return (h00 * y[i] +
-                h10 * m[i] * delta_x[i] +
-                h01 * y[i + 1] +
-                h11 * w[i + 1] * delta_x[i])
+        return (
+            h00 * y[i] + h10 * m[i] * delta_x[i] + h01 * y[i + 1] +
+            h11 * w[i + 1] * delta_x[i]
+        )
 
     for i in range(n + 1):
         yield x[i], y[i]
@@ -239,7 +238,6 @@ INTERPOLATIONS = {
     'trigonometric': trigonometric_interpolate
 }
 
-
 if __name__ == '__main__':
     from pygal import XY
     points = [(.1, 7), (.3, -4), (.6, 10), (.9, 8), (1.4, 3), (1.7, 1)]
@@ -249,16 +247,32 @@ if __name__ == '__main__':
     xy.add('cubic', cubic_interpolate(*zip(*points)))
     xy.add('lagrange', lagrange_interpolate(*zip(*points)))
     xy.add('trigonometric', trigonometric_interpolate(*zip(*points)))
-    xy.add('hermite catmul_rom', hermite_interpolate(
-        *zip(*points), type='catmul_rom'))
-    xy.add('hermite finite_difference', hermite_interpolate(
-        *zip(*points), type='finite_difference'))
-    xy.add('hermite cardinal -.5', hermite_interpolate(
-        *zip(*points), type='cardinal', c=-.5))
-    xy.add('hermite cardinal .5', hermite_interpolate(
-        *zip(*points), type='cardinal', c=.5))
-    xy.add('hermite kochanek_bartels .5 .75 -.25', hermite_interpolate(
-        *zip(*points), type='kochanek_bartels', c=.5, b=.75, t=-.25))
-    xy.add('hermite kochanek_bartels .25 -.75 .5', hermite_interpolate(
-        *zip(*points), type='kochanek_bartels', c=.25, b=-.75, t=.5))
+    xy.add(
+        'hermite catmul_rom',
+        hermite_interpolate(*zip(*points), type='catmul_rom')
+    )
+    xy.add(
+        'hermite finite_difference',
+        hermite_interpolate(*zip(*points), type='finite_difference')
+    )
+    xy.add(
+        'hermite cardinal -.5',
+        hermite_interpolate(*zip(*points), type='cardinal', c=-.5)
+    )
+    xy.add(
+        'hermite cardinal .5',
+        hermite_interpolate(*zip(*points), type='cardinal', c=.5)
+    )
+    xy.add(
+        'hermite kochanek_bartels .5 .75 -.25',
+        hermite_interpolate(
+            *zip(*points), type='kochanek_bartels', c=.5, b=.75, t=-.25
+        )
+    )
+    xy.add(
+        'hermite kochanek_bartels .25 -.75 .5',
+        hermite_interpolate(
+            *zip(*points), type='kochanek_bartels', c=.25, b=-.75, t=.5
+        )
+    )
     xy.render_in_browser()

pygal/maps/__init__.py

@@ -16,5 +16,4 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Maps extensions namespace module"""

pygal/serie.py

@@ -22,7 +22,6 @@ from pygal.util import cached_property
 
 
 class Serie(object):
-
     """Serie class containing title, values and the graph serie index"""
 
     def __init__(self, index, values, config, metadata=None):

pygal/state.py

@@ -16,14 +16,12 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Class holding state during render"""
 
 from pygal.util import merge
 
 
 class State(object):
-
     """
     Class containing config values
     overriden by chart values

pygal/stats.py

@@ -35,15 +35,18 @@ def ppf(x, n):
             # http://eprints.maths.ox.ac.uk/184/1/tdist.pdf
             raise ImportError(
                 'You must have scipy installed to use t-student '
-                'when sample_size is below 30')
+                'when sample_size is below 30'
+            )
         return norm_ppf(x)
 
+
 # According to http://sphweb.bumc.bu.edu/otlt/MPH-Modules/BS/
 # BS704_Confidence_Intervals/BS704_Confidence_Intervals_print.html
 
 
 def confidence_interval_continuous(
-        point_estimate, stddev, sample_size, confidence=.95, **kwargs):
+        point_estimate, stddev, sample_size, confidence=.95, **kwargs
+):
     """Continuous confidence interval from sample size and standard error"""
     alpha = ppf((confidence + 1) / 2, sample_size - 1)
 
@@ -52,8 +55,13 @@ def confidence_interval_continuous(
 
 
 def confidence_interval_dichotomous(
-        point_estimate, sample_size, confidence=.95, bias=False,
-        percentage=True, **kwargs):
+        point_estimate,
+        sample_size,
+        confidence=.95,
+        bias=False,
+        percentage=True,
+        **kwargs
+):
     """Dichotomous confidence interval from sample size and maybe a bias"""
     alpha = ppf((confidence + 1) / 2, sample_size - 1)
     p = point_estimate

pygal/style.py

@@ -27,7 +27,6 @@ from pygal.colors import darken, is_foreground_light, lighten
 
 
 class Style(object):
-
     """Styling class containing colors for the css generation"""
 
     plot_background = 'rgba(255, 255, 255, 1)'
@@ -38,8 +37,7 @@ class Style(object):
     foreground_subtle = 'rgba(0, 0, 0, .54)'
 
     # Monospaced font is highly encouraged
-    font_family = (
-        'Consolas, "Liberation Mono", Menlo, Courier, monospace')
+    font_family = ('Consolas, "Liberation Mono", Menlo, Courier, monospace')
 
     label_font_family = None
     major_label_font_family = None
@@ -116,33 +114,36 @@ class Style(object):
                 elif fn.startswith('googlefont:'):
                     setattr(self, name, fn.replace('googlefont:', ''))
                     self._google_fonts.add(
-                        getattr(self, name).split(',')[0].strip())
+                        getattr(self, name).split(',')[0].strip()
+                    )
 
     def get_colors(self, prefix, len_):
         """Get the css color list"""
+
         def color(tupl):
             """Make a color css"""
             return ((
                 '%s.color-{0}, %s.color-{0} a:visited {{\n'
                 '  stroke: {1};\n'
                 '  fill: {1};\n'
-                '}}\n') % (prefix, prefix)).format(*tupl)
+                '}}\n'
+            ) % (prefix, prefix)).format(*tupl)
 
         def value_color(tupl):
             """Make a value color css"""
             return ((
                 '%s .text-overlay .color-{0} text {{\n'
                 '  fill: {1};\n'
-                '}}\n') % (prefix,)).format(*tupl)
+                '}}\n'
+            ) % (prefix, )).format(*tupl)
 
         def ci_color(tupl):
             """Make a value color css"""
             if not tupl[1]:
                 return ''
-            return ((
-                '%s .color-{0} .ci {{\n'
-                '  stroke: {1};\n'
-                '}}\n') % (prefix,)).format(*tupl)
+            return (('%s .color-{0} .ci {{\n'
+                     '  stroke: {1};\n'
+                     '}}\n') % (prefix, )).format(*tupl)
 
         if len(self.colors) < len_:
             missing = len_ - len(self.colors)
@@ -165,13 +166,17 @@ class Style(object):
             if i < len(self.value_colors) and self.value_colors[i] is not None:
                 value_colors.append(self.value_colors[i])
             else:
-                value_colors.append('white' if is_foreground_light(
-                    colors[i]) else 'black')
-
-        return '\n'.join(chain(
-            map(color, enumerate(colors)),
-            map(value_color, enumerate(value_colors)),
-            map(ci_color, enumerate(self.ci_colors))))
+                value_colors.append(
+                    'white' if is_foreground_light(colors[i]) else 'black'
+                )
+
+        return '\n'.join(
+            chain(
+                map(color, enumerate(colors)),
+                map(value_color, enumerate(value_colors)),
+                map(ci_color, enumerate(self.ci_colors))
+            )
+        )
 
     def to_dict(self):
         """Convert instance to a serializable mapping."""
@@ -188,7 +193,6 @@ DefaultStyle = Style
 
 
 class DarkStyle(Style):
-
     """A dark style (old default)"""
 
     background = 'black'
@@ -200,14 +204,13 @@ class DarkStyle(Style):
     opacity_hover = '.4'
     transition = '250ms'
     colors = (
-        '#ff5995', '#b6e354', '#feed6c', '#8cedff', '#9e6ffe',
-        '#899ca1', '#f8f8f2', '#bf4646', '#516083', '#f92672',
-        '#82b414', '#fd971f', '#56c2d6', '#808384', '#8c54fe',
-        '#465457')
+        '#ff5995', '#b6e354', '#feed6c', '#8cedff', '#9e6ffe', '#899ca1',
+        '#f8f8f2', '#bf4646', '#516083', '#f92672', '#82b414', '#fd971f',
+        '#56c2d6', '#808384', '#8c54fe', '#465457'
+    )
 
 
 class LightStyle(Style):
-
     """A light style"""
 
     background = 'white'
@@ -215,13 +218,13 @@ class LightStyle(Style):
     foreground = 'rgba(0, 0, 0, 0.7)'
     foreground_strong = 'rgba(0, 0, 0, 0.9)'
     foreground_subtle = 'rgba(0, 0, 0, 0.5)'
-    colors = ('#242424', '#9f6767', '#92ac68',
-              '#d0d293', '#9aacc3', '#bb77a4',
-              '#77bbb5', '#777777')
+    colors = (
+        '#242424', '#9f6767', '#92ac68', '#d0d293', '#9aacc3', '#bb77a4',
+        '#77bbb5', '#777777'
+    )
 
 
 class NeonStyle(DarkStyle):
-
     """Similar to DarkStyle but with more opacity and effects"""
 
     opacity = '.1'
@@ -230,7 +233,6 @@ class NeonStyle(DarkStyle):
 
 
 class CleanStyle(Style):
-
     """A rather clean style"""
 
     background = 'transparent'
@@ -240,11 +242,11 @@ class CleanStyle(Style):
     foreground_subtle = 'rgba(0, 0, 0, 0.5)'
     colors = (
         'rgb(12,55,149)', 'rgb(117,38,65)', 'rgb(228,127,0)', 'rgb(159,170,0)',
-        'rgb(149,12,12)')
+        'rgb(149,12,12)'
+    )
 
 
 class DarkSolarizedStyle(Style):
-
     """Dark solarized popular theme"""
 
     background = '#073642'
@@ -256,12 +258,12 @@ class DarkSolarizedStyle(Style):
     opacity_hover = '.9'
     transition = '500ms ease-in'
     colors = (
-        '#b58900', '#cb4b16', '#dc322f', '#d33682',
-        '#6c71c4', '#268bd2', '#2aa198', '#859900')
+        '#b58900', '#cb4b16', '#dc322f', '#d33682', '#6c71c4', '#268bd2',
+        '#2aa198', '#859900'
+    )
 
 
 class LightSolarizedStyle(DarkSolarizedStyle):
-
     """Light solarized popular theme"""
 
     background = '#fdf6e3'
@@ -272,7 +274,6 @@ class LightSolarizedStyle(DarkSolarizedStyle):
 
 
 class RedBlueStyle(Style):
-
     """A red and blue theme"""
 
     background = lighten('#e6e7e9', 7)
@@ -283,13 +284,13 @@ class RedBlueStyle(Style):
     opacity = '.6'
     opacity_hover = '.9'
     colors = (
-        '#d94e4c', '#e5884f', '#39929a',
-        lighten('#d94e4c', 10), darken('#39929a', 15), lighten('#e5884f', 17),
-        darken('#d94e4c', 10), '#234547')
+        '#d94e4c', '#e5884f', '#39929a', lighten('#d94e4c', 10),
+        darken('#39929a', 15), lighten('#e5884f', 17), darken('#d94e4c', 10),
+        '#234547'
+    )
 
 
 class LightColorizedStyle(Style):
-
     """A light colorized style"""
 
     background = '#f8f8f8'
@@ -301,13 +302,13 @@ class LightColorizedStyle(Style):
     opacity_hover = '.9'
     transition = '250ms ease-in'
     colors = (
-        '#fe9592', '#534f4c', '#3ac2c0', '#a2a7a1',
-        darken('#fe9592', 15), lighten('#534f4c', 15), lighten('#3ac2c0', 15),
-        lighten('#a2a7a1', 15), lighten('#fe9592', 15), darken('#3ac2c0', 10))
+        '#fe9592', '#534f4c', '#3ac2c0', '#a2a7a1', darken('#fe9592', 15),
+        lighten('#534f4c', 15), lighten('#3ac2c0', 15), lighten('#a2a7a1', 15),
+        lighten('#fe9592', 15), darken('#3ac2c0', 10)
+    )
 
 
 class DarkColorizedStyle(Style):
-
     """A dark colorized style"""
 
     background = darken('#3a2d3f', 5)
@@ -321,11 +322,11 @@ class DarkColorizedStyle(Style):
     colors = (
         '#c900fe', '#01b8fe', '#59f500', '#ff00e4', '#f9fa00',
         darken('#c900fe', 20), darken('#01b8fe', 15), darken('#59f500', 20),
-        darken('#ff00e4', 15), lighten('#f9fa00', 20))
+        darken('#ff00e4', 15), lighten('#f9fa00', 20)
+    )
 
 
 class TurquoiseStyle(Style):
-
     """A turquoise style"""
 
     background = darken('#1b8088', 15)
@@ -337,13 +338,12 @@ class TurquoiseStyle(Style):
     opacity_hover = '.9'
     transition = '250ms ease-in'
     colors = (
-        '#93d2d9', '#ef940f', '#8C6243', '#fff',
-        darken('#93d2d9', 20), lighten('#ef940f', 15),
-        lighten('#8c6243', 15), '#1b8088')
+        '#93d2d9', '#ef940f', '#8C6243', '#fff', darken('#93d2d9', 20),
+        lighten('#ef940f', 15), lighten('#8c6243', 15), '#1b8088'
+    )
 
 
 class LightGreenStyle(Style):
-
     """A light green style"""
 
     background = lighten('#f3f3f3', 3)
@@ -357,11 +357,11 @@ class LightGreenStyle(Style):
     colors = (
         '#7dcf30', '#247fab', lighten('#7dcf30', 10), '#ccc',
         darken('#7dcf30', 15), '#ddd', lighten('#247fab', 10),
-        darken('#247fab', 15))
+        darken('#247fab', 15)
+    )
 
 
 class DarkGreenStyle(Style):
-
     """A dark green style"""
 
     background = darken('#251e01', 3)
@@ -374,11 +374,11 @@ class DarkGreenStyle(Style):
     transition = '250ms ease-in'
     colors = (
         '#adde09', '#6e8c06', '#4a5e04', '#fcd202', '#C1E34D',
-        lighten('#fcd202', 25))
+        lighten('#fcd202', 25)
+    )
 
 
 class DarkGreenBlueStyle(Style):
-
     """A dark green and blue style"""
 
     background = '#000'
@@ -389,13 +389,14 @@ class DarkGreenBlueStyle(Style):
     opacity = '.55'
     opacity_hover = '.9'
     transition = '250ms ease-in'
-    colors = (lighten('#34B8F7', 15), '#7dcf30', '#247fab',
-              darken('#7dcf30', 10), lighten('#247fab', 10),
-              lighten('#7dcf30', 10), darken('#247fab', 10), '#fff')
+    colors = (
+        lighten('#34B8F7', 15), '#7dcf30', '#247fab', darken('#7dcf30', 10),
+        lighten('#247fab', 10), lighten('#7dcf30', 10), darken('#247fab', 10),
+        '#fff'
+    )
 
 
 class BlueStyle(Style):
-
     """A blue style"""
 
     background = darken('#f8f8f8', 3)
@@ -409,11 +410,11 @@ class BlueStyle(Style):
     colors = (
         '#00b2f0', '#43d9be', '#0662ab', darken('#00b2f0', 20),
         lighten('#43d9be', 20), lighten('#7dcf30', 10), darken('#0662ab', 15),
-        '#ffd541', '#7dcf30', lighten('#00b2f0', 15), darken('#ffd541', 20))
+        '#ffd541', '#7dcf30', lighten('#00b2f0', 15), darken('#ffd541', 20)
+    )
 
 
 class SolidColorStyle(Style):
-
     """A light style with strong colors"""
 
     background = '#FFFFFF'
@@ -425,30 +426,32 @@ class SolidColorStyle(Style):
     opacity_hover = '.9'
     transition = '400ms ease-in'
     colors = (
-        '#FF9900', '#DC3912', '#4674D1', '#109618', '#990099',
-        '#0099C6', '#DD4477', '#74B217', '#B82E2E', '#316395', '#994499')
-
-
-styles = {'default': DefaultStyle,
-          'dark': DarkStyle,
-          'light': LightStyle,
-          'neon': NeonStyle,
-          'clean': CleanStyle,
-          'light_red_blue': RedBlueStyle,
-          'dark_solarized': DarkSolarizedStyle,
-          'light_solarized': LightSolarizedStyle,
-          'dark_colorized': DarkColorizedStyle,
-          'light_colorized': LightColorizedStyle,
-          'turquoise': TurquoiseStyle,
-          'green': LightGreenStyle,
-          'dark_green': DarkGreenStyle,
-          'dark_green_blue': DarkGreenBlueStyle,
-          'blue': BlueStyle,
-          'solid_color': SolidColorStyle}
+        '#FF9900', '#DC3912', '#4674D1', '#109618', '#990099', '#0099C6',
+        '#DD4477', '#74B217', '#B82E2E', '#316395', '#994499'
+    )
 
 
-class ParametricStyleBase(Style):
+styles = {
+    'default': DefaultStyle,
+    'dark': DarkStyle,
+    'light': LightStyle,
+    'neon': NeonStyle,
+    'clean': CleanStyle,
+    'light_red_blue': RedBlueStyle,
+    'dark_solarized': DarkSolarizedStyle,
+    'light_solarized': LightSolarizedStyle,
+    'dark_colorized': DarkColorizedStyle,
+    'light_colorized': LightColorizedStyle,
+    'turquoise': TurquoiseStyle,
+    'green': LightGreenStyle,
+    'dark_green': DarkGreenStyle,
+    'dark_green_blue': DarkGreenBlueStyle,
+    'blue': BlueStyle,
+    'solid_color': SolidColorStyle
+}
+
 
+class ParametricStyleBase(Style):
     """Parametric Style base class for all the parametric operations"""
 
     _op = None
@@ -495,35 +498,30 @@ class ParametricStyleBase(Style):
 
 
 class LightenStyle(ParametricStyleBase):
-
     """Create a style by lightening the given color"""
 
     _op = 'lighten'
 
 
 class DarkenStyle(ParametricStyleBase):
-
     """Create a style by darkening the given color"""
 
     _op = 'darken'
 
 
 class SaturateStyle(ParametricStyleBase):
-
     """Create a style by saturating the given color"""
 
     _op = 'saturate'
 
 
 class DesaturateStyle(ParametricStyleBase):
-
     """Create a style by desaturating the given color"""
 
     _op = 'desaturate'
 
 
 class RotateStyle(ParametricStyleBase):
-
     """Create a style by rotating the given color"""
 
     _op = 'rotate'

pygal/svg.py

@@ -32,13 +32,13 @@ from pygal._compat import quote_plus, to_str, u
 from pygal.etree import etree
 from pygal.util import (
     coord_abs_project, coord_diff, coord_dual, coord_format, coord_project,
-    minify_css, template)
+    minify_css, template
+)
 
 nearly_2pi = 2 * pi - .00001
 
 
 class Svg(object):
-
     """Svg related methods"""
 
     ns = 'http://www.w3.org/2000/svg'
@@ -53,16 +53,9 @@ class Svg(object):
             self.id = ''
         self.processing_instructions = []
         if etree.lxml:
-            attrs = {
-                'nsmap': {
-                    None: self.ns,
-                    'xlink': self.xlink_ns
-                }
-            }
+            attrs = {'nsmap': {None: self.ns, 'xlink': self.xlink_ns}}
         else:
-            attrs = {
-                'xmlns': self.ns
-            }
+            attrs = {'xmlns': self.ns}
             if hasattr(etree, 'register_namespace'):
                 etree.register_namespace('xlink', self.xlink_ns)
             else:
@@ -73,11 +66,15 @@ class Svg(object):
         if graph.classes:
             self.root.attrib['class'] = ' '.join(graph.classes)
         self.root.append(
-            etree.Comment(u(
-                'Generated with pygal %s (%s) ©Kozea 2012-2016 on %s' % (
-                    __version__,
-                    'lxml' if etree.lxml else 'etree',
-                    date.today().isoformat()))))
+            etree.Comment(
+                u(
+                    'Generated with pygal %s (%s) ©Kozea 2012-2016 on %s' % (
+                        __version__, 'lxml' if etree.lxml else 'etree',
+                        date.today().isoformat()
+                    )
+                )
+            )
+        )
         self.root.append(etree.Comment(u('http://pygal.org')))
         self.root.append(etree.Comment(u('http://github.com/Kozea/pygal')))
         self.defs = self.node(tag='defs')
@@ -96,8 +93,8 @@ class Svg(object):
 
         if self.graph.style._google_fonts:
             auto_css.append(
-                '//fonts.googleapis.com/css?family=%s' % quote_plus(
-                    '|'.join(self.graph.style._google_fonts))
+                '//fonts.googleapis.com/css?family=%s' %
+                quote_plus('|'.join(self.graph.style._google_fonts))
             )
 
         for css in auto_css + list(self.graph.css):
@@ -108,8 +105,7 @@ class Svg(object):
                 css = css[len('file://'):]
 
                 if not os.path.exists(css):
-                    css = os.path.join(
-                        os.path.dirname(__file__), 'css', css)
+                    css = os.path.join(os.path.dirname(__file__), 'css', css)
 
                 with io.open(css, encoding='utf-8') as f:
                     css_text = template(
@@ -117,7 +113,8 @@ class Svg(object):
                         style=self.graph.style,
                         colors=colors,
                         strokes=strokes,
-                        id=self.id)
+                        id=self.id
+                    )
 
             if css_text is not None:
                 if not self.graph.pretty_print:
@@ -127,10 +124,11 @@ class Svg(object):
                 if css.startswith('//') and self.graph.force_uri_protocol:
                     css = '%s:%s' % (self.graph.force_uri_protocol, css)
                 self.processing_instructions.append(
-                    etree.PI(
-                        u('xml-stylesheet'), u('href="%s"' % css)))
+                    etree.PI(u('xml-stylesheet'), u('href="%s"' % css))
+                )
         self.node(
-            self.defs, 'style', type='text/css').text = '\n'.join(all_css)
+            self.defs, 'style', type='text/css'
+        ).text = '\n'.join(all_css)
 
     def add_scripts(self):
         """Add the js to the svg"""
@@ -140,8 +138,9 @@ class Svg(object):
             return dict(
                 (k, getattr(self.graph.state, k))
                 for k in dir(self.graph.config)
-                if not k.startswith('_') and hasattr(self.graph.state, k) and
-                not hasattr(getattr(self.graph.state, k), '__call__'))
+                if not k.startswith('_') and hasattr(self.graph.state, k)
+                and not hasattr(getattr(self.graph.state, k), '__call__')
+            )
 
         def json_default(o):
             if isinstance(o, (datetime, date)):
@@ -154,7 +153,8 @@ class Svg(object):
         # Config adds
         dct['legends'] = [
             l.get('title') if isinstance(l, dict) else l
-            for l in self.graph._legends + self.graph._secondary_legends]
+            for l in self.graph._legends + self.graph._secondary_legends
+        ]
 
         common_js = 'window.pygal = window.pygal || {};'
         common_js += 'window.pygal.config = window.pygal.config || {};'
@@ -187,7 +187,7 @@ class Svg(object):
 
         for pos, dim in (('x', 'width'), ('y', 'height')):
             if in_attrib_and_number(dim) and attrib[dim] < 0:
-                attrib[dim] = - attrib[dim]
+                attrib[dim] = -attrib[dim]
                 if in_attrib_and_number(pos):
                     attrib[pos] = attrib[pos] - attrib[dim]
 
@@ -200,8 +200,8 @@ class Svg(object):
                 attrib[key.rstrip('_')] = attrib[key]
                 del attrib[key]
             elif key == 'href':
-                attrib[etree.QName(
-                    'http://www.w3.org/1999/xlink', key)] = attrib[key]
+                attrib[etree.QName('http://www.w3.org/1999/xlink',
+                                   key)] = attrib[key]
                 del attrib[key]
         return etree.SubElement(parent, tag, attrib)
 
@@ -226,16 +226,17 @@ class Svg(object):
         return dict(
             plot=self.node(
                 self.graph.nodes['plot'],
-                class_='series serie-%d color-%d' % (
-                    serie.index, serie.index)),
+                class_='series serie-%d color-%d' % (serie.index, serie.index)
+            ),
             overlay=self.node(
                 self.graph.nodes['overlay'],
-                class_='series serie-%d color-%d' % (
-                    serie.index, serie.index)),
+                class_='series serie-%d color-%d' % (serie.index, serie.index)
+            ),
             text_overlay=self.node(
                 self.graph.nodes['text_overlay'],
-                class_='series serie-%d color-%d' % (
-                    serie.index, serie.index)))
+                class_='series serie-%d color-%d' % (serie.index, serie.index)
+            )
+        )
 
     def line(self, node, coords, close=False, **kwargs):
         """Draw a svg line"""
@@ -254,47 +255,54 @@ class Svg(object):
             coord_format = lambda xy: '%f %f' % xy
 
         origin = coord_format(coords[origin_index])
-        line = ' '.join([coord_format(c)
-                         for c in coords[origin_index + 1:]
-                         if None not in c])
-        return self.node(
-            node, 'path', d=root % (origin, line), **kwargs)
+        line = ' '.join([
+            coord_format(c) for c in coords[origin_index + 1:] if None not in c
+        ])
+        return self.node(node, 'path', d=root % (origin, line), **kwargs)
 
     def slice(
-            self, serie_node, node, radius, small_radius,
-            angle, start_angle, center, val, i, metadata):
+            self, serie_node, node, radius, small_radius, angle, start_angle,
+            center, val, i, metadata
+    ):
         """Draw a pie slice"""
         if angle == 2 * pi:
             angle = nearly_2pi
 
         if angle > 0:
-            to = [coord_abs_project(center, radius, start_angle),
-                  coord_abs_project(center, radius, start_angle + angle),
-                  coord_abs_project(center, small_radius, start_angle + angle),
-                  coord_abs_project(center, small_radius, start_angle)]
+            to = [
+                coord_abs_project(center, radius, start_angle),
+                coord_abs_project(center, radius, start_angle + angle),
+                coord_abs_project(center, small_radius, start_angle + angle),
+                coord_abs_project(center, small_radius, start_angle)
+            ]
             rv = self.node(
-                node, 'path',
+                node,
+                'path',
                 d='M%s A%s 0 %d 1 %s L%s A%s 0 %d 0 %s z' % (
-                    to[0],
-                    coord_dual(radius), int(angle > pi), to[1],
-                    to[2],
-                    coord_dual(small_radius), int(angle > pi), to[3]),
-                class_='slice reactive tooltip-trigger')
+                    to[0], coord_dual(radius), int(angle > pi), to[1], to[2],
+                    coord_dual(small_radius), int(angle > pi), to[3]
+                ),
+                class_='slice reactive tooltip-trigger'
+            )
         else:
             rv = None
-        x, y = coord_diff(center, coord_project(
-            (radius + small_radius) / 2, start_angle + angle / 2))
+        x, y = coord_diff(
+            center,
+            coord_project((radius + small_radius) / 2, start_angle + angle / 2)
+        )
 
         self.graph._tooltip_data(
-            node, val, x, y, "centered",
-            self.graph._x_labels and self.graph._x_labels[i][0])
+            node, val, x, y, "centered", self.graph._x_labels
+            and self.graph._x_labels[i][0]
+        )
         if angle >= 0.3:  # 0.3 radians is about 17 degrees
             self.graph._static_value(serie_node, val, x, y, metadata)
         return rv
 
     def gauge_background(
             self, serie_node, start_angle, center, radius, small_radius,
-            end_angle, half_pie, max_value):
+            end_angle, half_pie, max_value
+    ):
 
         if end_angle == 2 * pi:
             end_angle = nearly_2pi
@@ -303,37 +311,45 @@ class Svg(object):
             coord_abs_project(center, radius, start_angle),
             coord_abs_project(center, radius, end_angle),
             coord_abs_project(center, small_radius, end_angle),
-            coord_abs_project(center, small_radius, start_angle)]
+            coord_abs_project(center, small_radius, start_angle)
+        ]
 
         self.node(
-            serie_node['plot'], 'path',
+            serie_node['plot'],
+            'path',
             d='M%s A%s 0 1 1 %s L%s A%s 0 1 0 %s z' % (
-                to_shade[0],
-                coord_dual(radius),
-                to_shade[1],
-                to_shade[2],
-                coord_dual(small_radius),
-                to_shade[3]),
-            class_='gauge-background reactive')
+                to_shade[0], coord_dual(radius), to_shade[1], to_shade[2],
+                coord_dual(small_radius), to_shade[3]
+            ),
+            class_='gauge-background reactive'
+        )
 
         if half_pie:
             begin_end = [
                 coord_diff(
                     center,
                     coord_project(
-                        radius - (radius - small_radius) / 2, start_angle)),
+                        radius - (radius - small_radius) / 2, start_angle
+                    )
+                ),
                 coord_diff(
                     center,
                     coord_project(
-                        radius - (radius - small_radius) / 2, end_angle))]
+                        radius - (radius - small_radius) / 2, end_angle
+                    )
+                )
+            ]
             pos = 0
             for i in begin_end:
                 self.node(
-                    serie_node['plot'], 'text',
+                    serie_node['plot'],
+                    'text',
                     class_='y-{} bound reactive'.format(pos),
                     x=i[0],
                     y=i[1] + 10,
-                    attrib={'text-anchor': 'middle'}
+                    attrib={
+                        'text-anchor': 'middle'
+                    }
                 ).text = '{}'.format(0 if pos == 0 else max_value)
                 pos += 1
         else:
@@ -341,22 +357,21 @@ class Svg(object):
             # Correct text vertical alignment
             middle_radius -= .1 * (radius - small_radius)
             to_labels = [
-                coord_abs_project(
-                    center, middle_radius, 0),
-                coord_abs_project(
-                    center, middle_radius, nearly_2pi)
+                coord_abs_project(center, middle_radius, 0),
+                coord_abs_project(center, middle_radius, nearly_2pi)
             ]
             self.node(
-                self.defs, 'path', id='valuePath-%s%s' % center,
-                d='M%s A%s 0 1 1 %s' % (
-                    to_labels[0],
-                    coord_dual(middle_radius),
-                    to_labels[1]
-                ))
-            text_ = self.node(
-                serie_node['text_overlay'], 'text')
+                self.defs,
+                'path',
+                id='valuePath-%s%s' % center,
+                d='M%s A%s 0 1 1 %s' %
+                (to_labels[0], coord_dual(middle_radius), to_labels[1])
+            )
+            text_ = self.node(serie_node['text_overlay'], 'text')
             self.node(
-                text_, 'textPath', class_='max-value reactive',
+                text_,
+                'textPath',
+                class_='max-value reactive',
                 attrib={
                     'href': '#valuePath-%s%s' % center,
                     'startOffset': '99%',
@@ -365,40 +380,42 @@ class Svg(object):
             ).text = max_value
 
     def solid_gauge(
-            self, serie_node, node, radius, small_radius,
-            angle, start_angle, center, val, i, metadata, half_pie, end_angle,
-            max_value):
+            self, serie_node, node, radius, small_radius, angle, start_angle,
+            center, val, i, metadata, half_pie, end_angle, max_value
+    ):
         """Draw a solid gauge slice and background slice"""
         if angle == 2 * pi:
             angle = nearly_2pi
 
         if angle > 0:
-            to = [coord_abs_project(center, radius, start_angle),
-                  coord_abs_project(center, radius, start_angle + angle),
-                  coord_abs_project(center, small_radius, start_angle + angle),
-                  coord_abs_project(center, small_radius, start_angle)]
+            to = [
+                coord_abs_project(center, radius, start_angle),
+                coord_abs_project(center, radius, start_angle + angle),
+                coord_abs_project(center, small_radius, start_angle + angle),
+                coord_abs_project(center, small_radius, start_angle)
+            ]
 
             self.node(
-                node, 'path',
+                node,
+                'path',
                 d='M%s A%s 0 %d 1 %s L%s A%s 0 %d 0 %s z' % (
-                    to[0],
-                    coord_dual(radius),
-                    int(angle > pi),
-                    to[1],
-                    to[2],
-                    coord_dual(small_radius),
-                    int(angle > pi),
-                    to[3]),
-                class_='slice reactive tooltip-trigger')
+                    to[0], coord_dual(radius), int(angle > pi), to[1], to[2],
+                    coord_dual(small_radius), int(angle > pi), to[3]
+                ),
+                class_='slice reactive tooltip-trigger'
+            )
         else:
             return
 
-        x, y = coord_diff(center, coord_project(
-            (radius + small_radius) / 2, start_angle + angle / 2))
+        x, y = coord_diff(
+            center,
+            coord_project((radius + small_radius) / 2, start_angle + angle / 2)
+        )
         self.graph._static_value(serie_node, val, x, y, metadata, 'middle')
         self.graph._tooltip_data(
-            node, val, x, y, "centered",
-            self.graph._x_labels and self.graph._x_labels[i][0])
+            node, val, x, y, "centered", self.graph._x_labels
+            and self.graph._x_labels[i][0]
+        )
 
     def confidence_interval(self, node, x, low, high, width=7):
         if self.graph.horizontal:
@@ -415,12 +432,17 @@ class Svg(object):
         ci = self.node(node, class_="ci")
 
         self.node(
-            ci, 'path', d="M%s L%s M%s L%s M%s L%s L%s M%s L%s" % tuple(
-                map(fmt, (
-                    top, shr(top), top, shl(top), top,
-                    bottom, shr(bottom), bottom, shl(bottom)
-                ))
-            ), class_='nofill reactive'
+            ci,
+            'path',
+            d="M%s L%s M%s L%s M%s L%s L%s M%s L%s" % tuple(
+                map(
+                    fmt, (
+                        top, shr(top), top, shl(top), top, bottom, shr(bottom),
+                        bottom, shl(bottom)
+                    )
+                )
+            ),
+            class_='nofill reactive'
         )
 
     def pre_render(self):
@@ -428,26 +450,28 @@ class Svg(object):
         self.add_styles()
         self.add_scripts()
         self.root.set(
-            'viewBox', '0 0 %d %d' % (self.graph.width, self.graph.height))
+            'viewBox', '0 0 %d %d' % (self.graph.width, self.graph.height)
+        )
         if self.graph.explicit_size:
             self.root.set('width', str(self.graph.width))
             self.root.set('height', str(self.graph.height))
 
     def draw_no_data(self):
         """Write the no data text to the svg"""
-        no_data = self.node(self.graph.nodes['text_overlay'], 'text',
-                            x=self.graph.view.width / 2,
-                            y=self.graph.view.height / 2,
-                            class_='no_data')
+        no_data = self.node(
+            self.graph.nodes['text_overlay'],
+            'text',
+            x=self.graph.view.width / 2,
+            y=self.graph.view.height / 2,
+            class_='no_data'
+        )
         no_data.text = self.graph.no_data_text
 
     def render(self, is_unicode=False, pretty_print=False):
         """Last thing to do before rendering"""
         for f in self.graph.xml_filters:
             self.root = f(self.root)
-        args = {
-            'encoding': 'utf-8'
-        }
+        args = {'encoding': 'utf-8'}
 
         svg = b''
         if etree.lxml:
@@ -457,14 +481,12 @@ class Svg(object):
             svg = b"<?xml version='1.0' encoding='utf-8'?>\n"
 
         if not self.graph.disable_xml_declaration:
-            svg += b'\n'.join(
-                [etree.tostring(
-                    pi, **args)
-                 for pi in self.processing_instructions]
-            )
+            svg += b'\n'.join([
+                etree.tostring(pi, **args)
+                for pi in self.processing_instructions
+            ])
 
-        svg += etree.tostring(
-            self.root, **args)
+        svg += etree.tostring(self.root, **args)
 
         if self.graph.disable_xml_declaration or is_unicode:
             svg = svg.decode('utf-8')
@@ -472,16 +494,17 @@ class Svg(object):
 
     def get_strokes(self):
         """Return a css snippet containing all stroke style options"""
+
         def stroke_dict_to_css(stroke, i=None):
             """Return a css style for the given option"""
-            css = ['%s.series%s {\n' % (
-                self.id, '.serie-%d' % i if i is not None else '')]
-            for key in (
-                    'width', 'linejoin', 'linecap',
-                    'dasharray', 'dashoffset'):
+            css = [
+                '%s.series%s {\n' %
+                (self.id, '.serie-%d' % i if i is not None else '')
+            ]
+            for key in ('width', 'linejoin', 'linecap', 'dasharray',
+                        'dashoffset'):
                 if stroke.get(key):
-                    css.append('  stroke-%s: %s;\n' % (
-                        key, stroke[key]))
+                    css.append('  stroke-%s: %s;\n' % (key, stroke[key]))
             css.append('}')
             return '\n'.join(css)
 
@@ -494,6 +517,9 @@ class Svg(object):
 
         for secondary_serie in self.graph.secondary_series:
             if secondary_serie.stroke_style is not None:
-                css.append(stroke_dict_to_css(
-                    secondary_serie.stroke_style, secondary_serie.index))
+                css.append(
+                    stroke_dict_to_css(
+                        secondary_serie.stroke_style, secondary_serie.index
+                    )
+                )
         return '\n'.join(css)

pygal/table.py

@@ -30,7 +30,6 @@ from pygal.util import template
 
 
 class HTML(object):
-
     """Lower case adapter of lxml builder"""
 
     def __getattribute__(self, attr):
@@ -39,7 +38,6 @@ class HTML(object):
 
 
 class Table(object):
-
     """Table generator class"""
 
     _dual = None
@@ -135,33 +133,23 @@ class Table(object):
         if thead:
             parts.append(
                 html.thead(
-                    *[html.tr(
-                        *[html.th(_(col)) for col in r]
-                    ) for r in thead]
+                    *[html.tr(*[html.th(_(col)) for col in r]) for r in thead]
                 )
             )
         if tbody:
             parts.append(
                 html.tbody(
-                    *[html.tr(
-                        *[html.td(_(col)) for col in r]
-                    ) for r in tbody]
+                    *[html.tr(*[html.td(_(col)) for col in r]) for r in tbody]
                 )
             )
         if tfoot:
             parts.append(
                 html.tfoot(
-                    *[html.tr(
-                        *[html.th(_(col)) for col in r]
-                    ) for r in tfoot]
+                    *[html.tr(*[html.th(_(col)) for col in r]) for r in tfoot]
                 )
             )
 
-        table = tostring(
-            html.table(
-                *parts, **attrs
-            )
-        )
+        table = tostring(html.table(*parts, **attrs))
         if style:
             if style is True:
                 css = '''
@@ -197,9 +185,9 @@ class Table(object):
                 '''
             else:
                 css = style
-            table = tostring(html.style(
-                template(css, **attrs),
-                scoped='scoped')) + table
+            table = tostring(
+                html.style(template(css, **attrs), scoped='scoped')
+            ) + table
         table = table.decode('utf-8')
         self.chart.teardown()
         return table

pygal/test/__init__.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Pygal test package"""
 
 import pygal
@@ -27,12 +26,9 @@ from decimal import Decimal
 
 def get_data(i):
     """Return sample test data for an index"""
-    return [
-        [(-1, 1), (2, 0), (0, 4)],
-        [(0, 1), (None, 2), (3, 2)],
-        [(-3, 3), (1, 3), (1, 1)],
-        [(1, 1), (Decimal('1.'), 1), (1, 1)],
-        [(3, 2), (2, 1), (1., 1)]][i]
+    return [[(-1, 1), (2, 0), (0, 4)], [(0, 1), (None, 2), (3, 2)],
+            [(-3, 3), (1, 3), (1, 1)], [(1, 1), (Decimal('1.'), 1),
+                                        (1, 1)], [(3, 2), (2, 1), (1., 1)]][i]
 
 
 def adapt(chart, data):
@@ -52,7 +48,5 @@ def adapt(chart, data):
 def make_data(chart, datas):
     """Add sample data to the test chart"""
     for i, data in enumerate(datas):
-        chart.add(data[0],
-                  adapt(chart, data[1]),
-                  secondary=bool(i % 2))
+        chart.add(data[0], adapt(chart, data[1]), secondary=bool(i % 2))
     return chart

pygal/test/conftest.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """pytest fixtures"""
 
 import sys
@@ -54,8 +53,6 @@ def pytest_generate_tests(metafunc):
         metafunc.parametrize("Chart", pygal.CHARTS)
     if "datas" in metafunc.funcargnames:
         metafunc.parametrize(
-            "datas",
-            [
-                [("Serie %d" % i, get_data(i)) for i in range(s)]
-                for s in (5, 1, 0)
-            ])
+            "datas", [[("Serie %d" % i, get_data(i)) for i in range(s)]
+                      for s in (5, 1, 0)]
+        )

pygal/test/test_bar.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Bar chart related tests"""
 
 from pygal import Bar

pygal/test/test_box.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Box chart related tests"""
 
 from pygal.graph.box import Box
@@ -26,7 +25,8 @@ def test_quartiles():
     """Test box points for the 1.5IQR computation method"""
     a = [-2.0, 3.0, 4.0, 5.0, 8.0]  # odd test data
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        a, mode='1.5IQR')
+        a, mode='1.5IQR'
+    )
 
     assert q1 == 7.0 / 4.0
     assert q2 == 4.0
@@ -36,19 +36,22 @@ def test_quartiles():
 
     b = [1.0, 4.0, 6.0, 8.0]  # even test data
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        b, mode='1.5IQR')
+        b, mode='1.5IQR'
+    )
 
     assert q2 == 5.0
 
     c = [2.0, None, 4.0, 6.0, None]  # odd with None elements
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        c, mode='1.5IQR')
+        c, mode='1.5IQR'
+    )
 
     assert q2 == 4.0
 
     d = [4]
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        d, mode='1.5IQR')
+        d, mode='1.5IQR'
+    )
 
     assert q0 == 4
     assert q1 == 4
@@ -61,7 +64,8 @@ def test_quartiles_min_extremes():
     """Test box points for the extremes computation method"""
     a = [-2.0, 3.0, 4.0, 5.0, 8.0]  # odd test data
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        a, mode='extremes')
+        a, mode='extremes'
+    )
 
     assert q1 == 7.0 / 4.0
     assert q2 == 4.0
@@ -71,19 +75,22 @@ def test_quartiles_min_extremes():
 
     b = [1.0, 4.0, 6.0, 8.0]  # even test data
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        b, mode='extremes')
+        b, mode='extremes'
+    )
 
     assert q2 == 5.0
 
     c = [2.0, None, 4.0, 6.0, None]  # odd with None elements
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        c, mode='extremes')
+        c, mode='extremes'
+    )
 
     assert q2 == 4.0
 
     d = [4]
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        d, mode='extremes')
+        d, mode='extremes'
+    )
 
     assert q0 == 4
     assert q1 == 4
@@ -96,14 +103,16 @@ def test_quartiles_tukey():
     """Test box points for the tukey computation method"""
     a = []  # empty data
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        a, mode='tukey')
+        a, mode='tukey'
+    )
     assert min_s == q0 == q1 == q2 == q3 == q4 == 0
     assert outliers == []
 
     # https://en.wikipedia.org/wiki/Quartile example 1
     b = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49]
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        b, mode='tukey')
+        b, mode='tukey'
+    )
     assert min_s == q0 == 6
     assert q1 == 20.25
     assert q2 == 40
@@ -114,7 +123,8 @@ def test_quartiles_tukey():
     # previous test with added outlier 75
     c = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49, 75]
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        c, mode='tukey')
+        c, mode='tukey'
+    )
     assert min_s == q0 == 6
     assert q1 == 25.5
     assert q2 == (40 + 41) / 2.0
@@ -125,7 +135,8 @@ def test_quartiles_tukey():
     # one more outlier, 77
     c = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49, 75, 77]
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        c, mode='tukey')
+        c, mode='tukey'
+    )
     assert min_s == q0 == 6
     assert q1 == 30.75
     assert q2 == 41
@@ -137,11 +148,14 @@ def test_quartiles_tukey():
 
 def test_quartiles_stdev():
     """Test box points for the stdev computation method"""
-    a = [35, 42, 35, 41, 36, 6, 12, 51, 33, 27, 46, 36, 44, 53, 75, 46, 16,
-         51, 45, 29, 25, 26, 54, 61, 27, 40, 23, 34, 51, 37]
+    a = [
+        35, 42, 35, 41, 36, 6, 12, 51, 33, 27, 46, 36, 44, 53, 75, 46, 16, 51,
+        45, 29, 25, 26, 54, 61, 27, 40, 23, 34, 51, 37
+    ]
     SD = 14.67
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        a, mode='stdev')
+        a, mode='stdev'
+    )
     assert min_s == min(a)
     assert max_s == max(a)
     assert q2 == 36.5
@@ -151,7 +165,8 @@ def test_quartiles_stdev():
 
     b = [5]  # test for posible zero division
     (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
-        b, mode='stdev')
+        b, mode='stdev'
+    )
     assert min_s == q0 == q1 == q2 == q3 == q4 == max_s == b[0]
     assert outliers == []
 

pygal/test/test_colors.py

@@ -16,14 +16,14 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Color utility functions tests"""
 
 from __future__ import division
 
 from pygal.colors import (
     darken, desaturate, hsl_to_rgb, lighten, parse_color, rgb_to_hsl, rotate,
-    saturate, unparse_color)
+    saturate, unparse_color
+)
 
 
 def test_parse_color():

pygal/test/test_config.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Various config options tested on one chart type or more"""
 
 from tempfile import NamedTemporaryFile
@@ -25,7 +24,8 @@ from pygal import (
     XY, Bar, Box, Config, DateLine, DateTimeLine, Dot, Funnel, Gauge,
     Histogram, HorizontalBar, HorizontalLine, HorizontalStackedBar,
     HorizontalStackedLine, Line, Pie, Pyramid, Radar, SolidGauge,
-    TimeDeltaLine, TimeLine, Treemap, formatters)
+    TimeDeltaLine, TimeLine, Treemap, formatters
+)
 from pygal._compat import _ellipsis, u
 from pygal.graph.dual import Dual
 from pygal.graph.horizontal import HorizontalGraph
@@ -59,7 +59,8 @@ def test_config_behaviours():
         fill=True,
         pretty_print=True,
         no_prefix=True,
-        x_labels=['a', 'b', 'c'])
+        x_labels=['a', 'b', 'c']
+    )
     line2.add('_', [1, 2, 3])
     l2 = line2.render()
     assert l1 == l2
@@ -99,6 +100,7 @@ def test_config_behaviours():
 
 def test_config_alterations_class():
     """Assert a config can be changed on config class"""
+
     class LineConfig(Config):
         no_prefix = True
         show_legend = False
@@ -122,6 +124,7 @@ def test_config_alterations_class():
 
 def test_config_alterations_instance():
     """Assert a config can be changed on instance"""
+
     class LineConfig(Config):
         no_prefix = True
         show_legend = False
@@ -146,6 +149,7 @@ def test_config_alterations_instance():
 
 def test_config_alterations_kwargs():
     """Assert a config can be changed with keyword args"""
+
     class LineConfig(Config):
         no_prefix = True
         show_legend = False
@@ -181,7 +185,7 @@ def test_config_alterations_kwargs():
 def test_logarithmic():
     """Test logarithmic option"""
     line = Line(logarithmic=True)
-    line.add('_', [1, 10 ** 10, 1])
+    line.add('_', [1, 10**10, 1])
     q = line.render_pyquery()
     assert len(q(".axis.x")) == 0
     assert len(q(".axis.y")) == 1
@@ -227,7 +231,7 @@ def test_logarithmic_bad_interpolation():
 def test_logarithmic_big_scale():
     """Test logarithmic option with a large range of value"""
     line = Line(logarithmic=True)
-    line.add('_', [10 ** -10, 10 ** 10, 1])
+    line.add('_', [10**-10, 10**10, 1])
     q = line.render_pyquery()
     assert len(q(".y.axis .guides")) == 21
 
@@ -235,17 +239,20 @@ def test_logarithmic_big_scale():
 def test_value_formatter():
     """Test value formatter option"""
     line = Line(value_formatter=lambda x: str(x) + u('‰'))
-    line.add('_', [10 ** 4, 10 ** 5, 23 * 10 ** 4])
+    line.add('_', [10**4, 10**5, 23 * 10**4])
     q = line.render_pyquery()
     assert len(q(".y.axis .guides")) == 11
-    assert q(".axis.y text").map(texts) == list(map(
-        lambda x: str(x) + u('‰'), map(float, range(20000, 240000, 20000))))
+    assert q(".axis.y text").map(texts) == list(
+        map(
+            lambda x: str(x) + u('‰'), map(float, range(20000, 240000, 20000))
+        )
+    )
 
 
 def test_logarithmic_small_scale():
     """Test logarithmic with a small range of values"""
     line = Line(logarithmic=True)
-    line.add('_', [1 + 10 ** 10, 3 + 10 ** 10, 2 + 10 ** 10])
+    line.add('_', [1 + 10**10, 3 + 10**10, 2 + 10**10])
     q = line.render_pyquery()
     assert len(q(".y.axis .guides")) == 11
 
@@ -253,16 +260,18 @@ def test_logarithmic_small_scale():
 def test_human_readable():
     """Test human readable option"""
     line = Line()
-    line.add('_', [10 ** 4, 10 ** 5, 23 * 10 ** 4])
+    line.add('_', [10**4, 10**5, 23 * 10**4])
     q = line.render_pyquery()
-    assert q(".axis.y text").map(texts) == list(map(
-        str, range(20000, 240000, 20000)))
+    assert q(".axis.y text").map(texts) == list(
+        map(str, range(20000, 240000, 20000))
+    )
 
     line.value_formatter = formatters.human_readable
 
     q = line.render_pyquery()
-    assert q(".axis.y text").map(texts) == list(map(
-        lambda x: '%dk' % x, range(20, 240, 20)))
+    assert q(".axis.y text").map(texts) == list(
+        map(lambda x: '%dk' % x, range(20, 240, 20))
+    )
 
 
 def test_show_legend():
@@ -300,9 +309,8 @@ def test_no_data():
 def test_include_x_axis(Chart):
     """Test x axis inclusion option"""
     chart = Chart()
-    if Chart in (
-            Pie, Treemap, Radar, Funnel, Dot, Gauge, Histogram, Box, SolidGauge
-    ) or issubclass(Chart, BaseMap):
+    if Chart in (Pie, Treemap, Radar, Funnel, Dot, Gauge, Histogram, Box,
+                 SolidGauge) or issubclass(Chart, BaseMap):
         return
     if not chart._dual:
         data = 100, 200, 150
@@ -312,7 +320,8 @@ def test_include_x_axis(Chart):
     q = chart.render_pyquery()
     # Ghost thing
     yaxis = ".axis.%s .guides text" % (
-        'y' if not getattr(chart, 'horizontal', False) else 'x')
+        'y' if not getattr(chart, 'horizontal', False) else 'x'
+    )
     if not isinstance(chart, Bar):
         assert '0' not in q(yaxis).map(texts)
     else:
@@ -386,9 +395,11 @@ def test_legend_at_bottom(Chart):
 
 def test_x_y_title(Chart):
     """Test x title and y title options"""
-    chart = Chart(title='I Am A Title',
-                  x_title="I am a x title",
-                  y_title="I am a y title")
+    chart = Chart(
+        title='I Am A Title',
+        x_title="I am a x title",
+        y_title="I am a y title"
+    )
     chart.add('1', [4, -5, 123, 59, 38])
     chart.add('2', [89, 0, 8, .12, 8])
     q = chart.render_pyquery()
@@ -397,9 +408,7 @@ def test_x_y_title(Chart):
 
 def test_range(Chart):
     """Test y label major option"""
-    if Chart in (
-            Pie, Treemap, Dot, SolidGauge
-    ) or issubclass(Chart, BaseMap):
+    if Chart in (Pie, Treemap, Dot, SolidGauge) or issubclass(Chart, BaseMap):
         return
     chart = Chart()
     chart.range = (0, 100)
@@ -414,11 +423,10 @@ def test_range(Chart):
 
 def test_x_label_major(Chart):
     """Test x label major option"""
-    if Chart in (
-            Pie, Treemap, Funnel, Dot, Gauge, Histogram, Box, SolidGauge,
-            Pyramid, DateTimeLine, TimeLine, DateLine,
-            TimeDeltaLine
-    ) or issubclass(Chart, (BaseMap, Dual, HorizontalGraph)):
+    if Chart in (Pie, Treemap, Funnel, Dot, Gauge, Histogram, Box, SolidGauge,
+                 Pyramid, DateTimeLine, TimeLine, DateLine,
+                 TimeDeltaLine) or issubclass(
+                     Chart, (BaseMap, Dual, HorizontalGraph)):
         return
     chart = Chart()
     chart.add('test', range(12))
@@ -459,13 +467,10 @@ def test_x_label_major(Chart):
 
 def test_y_label_major(Chart):
     """Test y label major option"""
-    if Chart in (
-            Pie, Treemap, Funnel, Dot, Gauge, Histogram, Box, SolidGauge,
-            HorizontalBar, HorizontalStackedBar,
-            HorizontalStackedLine, HorizontalLine,
-            Pyramid, DateTimeLine, TimeLine, DateLine,
-            TimeDeltaLine
-    ) or issubclass(Chart, BaseMap):
+    if Chart in (Pie, Treemap, Funnel, Dot, Gauge, Histogram, Box, SolidGauge,
+                 HorizontalBar, HorizontalStackedBar, HorizontalStackedLine,
+                 HorizontalLine, Pyramid, DateTimeLine, TimeLine, DateLine,
+                 TimeDeltaLine) or issubclass(Chart, BaseMap):
         return
     chart = Chart()
     data = range(12)
@@ -529,24 +534,24 @@ def test_render_data_uri(Chart):
     chart = Chart(fill=True)
     chart.add(u('ééé'), [1, 2, 3])
     chart.add(u('èèè'), [10, 21, 5])
-    assert chart.render_data_uri().startswith(
-        'data:image/svg+xml;charset=utf-8;base64,')
+    assert chart.render_data_uri(
+    ).startswith('data:image/svg+xml;charset=utf-8;base64,')
 
 
 def test_formatters(Chart):
     """Test custom formatters"""
     if Chart._dual or Chart == Box:
         return
-    chart = Chart(
-        formatter=lambda x, chart, serie: '%s%s$' % (x, serie.title))
+    chart = Chart(formatter=lambda x, chart, serie: '%s%s$' % (x, serie.title))
     chart.add('_a', [1, 2, {'value': 3, 'formatter': lambda x: u('%s¥') % x}])
     chart.add('_b', [4, 5, 6], formatter=lambda x: u('%s€') % x)
     chart.x_labels = [2, 4, 6]
     chart.x_labels_major = [4]
     q = chart.render_pyquery()
-    assert set([v.text for v in q(".value")]) == set((
-        u('4€'), u('5€'), u('6€'), '1_a$', '2_a$', u('3¥')) + (
-            ('6_a$', u('15€')) if Chart in (Pie, SolidGauge) else ()))
+    assert set(
+        [v.text for v in q(".value")]
+    ) == set((u('4€'), u('5€'), u('6€'), '1_a$', '2_a$', u('3¥')) +
+             (('6_a$', u('15€')) if Chart in (Pie, SolidGauge) else ()))
 
 
 def test_classes(Chart):
@@ -557,10 +562,10 @@ def test_classes(Chart):
     chart = Chart(classes=())
     assert not chart.render_pyquery().attr('class')
 
-    chart = Chart(classes=(_ellipsis,))
+    chart = Chart(classes=(_ellipsis, ))
     assert chart.render_pyquery().attr('class') == 'pygal-chart'
 
-    chart = Chart(classes=('graph',))
+    chart = Chart(classes=('graph', ))
     assert chart.render_pyquery().attr('class') == 'graph'
 
     chart = Chart(classes=('pygal-chart', 'graph'))

pygal/test/test_date.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Date related charts tests"""
 
 from datetime import date, datetime, time, timedelta
@@ -29,149 +28,114 @@ from pygal.test.utils import texts
 def test_date():
     """Test a simple dateline"""
     date_chart = DateLine(truncate_label=1000)
-    date_chart.add('dates', [
-        (date(2013, 1, 2), 300),
-        (date(2013, 1, 12), 412),
-        (date(2013, 2, 2), 823),
-        (date(2013, 2, 22), 672)
-    ])
+    date_chart.add(
+        'dates', [(date(2013, 1, 2), 300), (date(2013, 1, 12), 412),
+                  (date(2013, 2, 2), 823), (date(2013, 2, 22), 672)]
+    )
 
     q = date_chart.render_pyquery()
 
-    assert list(
-        map(lambda t: t.split(' ')[0],
-            q(".axis.x text").map(texts))) == [
-                '2013-01-12',
-                '2013-01-24',
-                '2013-02-04',
-                '2013-02-16']
+    assert list(map(lambda t: t.split(' ')[0],
+                    q(".axis.x text").map(texts))) == [
+                        '2013-01-12', '2013-01-24', '2013-02-04', '2013-02-16'
+                    ]
 
 
 def test_time():
     """Test a simple timeline"""
     time_chart = TimeLine(truncate_label=1000)
-    time_chart.add('times', [
-        (time(1, 12, 29), 2),
-        (time(21, 2, 29), 10),
-        (time(12, 30, 59), 7)
-    ])
+    time_chart.add(
+        'times', [(time(1, 12, 29), 2), (time(21, 2, 29), 10),
+                  (time(12, 30, 59), 7)]
+    )
 
     q = time_chart.render_pyquery()
 
-    assert list(
-        map(lambda t: t.split(' ')[0],
-            q(".axis.x text").map(texts))) == [
-                '02:46:40',
-                '05:33:20',
-                '08:20:00',
-                '11:06:40',
-                '13:53:20',
-                '16:40:00',
-                '19:26:40']
+    assert list(map(lambda t: t.split(' ')[0],
+                    q(".axis.x text").map(texts))) == [
+                        '02:46:40', '05:33:20', '08:20:00', '11:06:40',
+                        '13:53:20', '16:40:00', '19:26:40'
+                    ]
 
 
 def test_datetime():
     """Test a simple datetimeline"""
     datetime_chart = DateTimeLine(truncate_label=1000)
-    datetime_chart.add('datetimes', [
-        (datetime(2013, 1, 2, 1, 12, 29), 300),
-        (datetime(2013, 1, 12, 21, 2, 29), 412),
-        (datetime(2013, 2, 2, 12, 30, 59), 823),
-        (datetime(2013, 2, 22), 672)
-    ])
+    datetime_chart.add(
+        'datetimes',
+        [(datetime(2013, 1, 2, 1, 12, 29), 300),
+         (datetime(2013, 1, 12, 21, 2, 29), 412),
+         (datetime(2013, 2, 2, 12, 30, 59), 823), (datetime(2013, 2, 22), 672)]
+    )
 
     q = datetime_chart.render_pyquery()
 
-    assert list(
-        map(lambda t: t.split(' ')[0],
-            q(".axis.x text").map(texts))) == [
-                '2013-01-12T14:13:20',
-                '2013-01-24T04:00:00',
-                '2013-02-04T17:46:40',
-                '2013-02-16T07:33:20']
+    assert list(map(lambda t: t.split(' ')[0],
+                    q(".axis.x text").map(texts))) == [
+                        '2013-01-12T14:13:20', '2013-01-24T04:00:00',
+                        '2013-02-04T17:46:40', '2013-02-16T07:33:20'
+                    ]
 
 
 def test_timedelta():
     """Test a simple timedeltaline"""
     timedelta_chart = TimeDeltaLine(truncate_label=1000)
-    timedelta_chart.add('timedeltas', [
-        (timedelta(seconds=1), 10),
-        (timedelta(weeks=1), 50),
-        (timedelta(hours=3, seconds=30), 3),
-        (timedelta(microseconds=12112), .3),
-    ])
+    timedelta_chart.add(
+        'timedeltas', [
+            (timedelta(seconds=1), 10),
+            (timedelta(weeks=1), 50),
+            (timedelta(hours=3, seconds=30), 3),
+            (timedelta(microseconds=12112), .3),
+        ]
+    )
 
     q = timedelta_chart.render_pyquery()
-    assert list(
-        t for t in q(".axis.x text").map(texts) if t != '0:00:00'
-    ) == [
-        '1 day, 3:46:40',
-        '2 days, 7:33:20',
-        '3 days, 11:20:00',
-        '4 days, 15:06:40',
-        '5 days, 18:53:20',
-        '6 days, 22:40:00']
+    assert list(t for t in q(".axis.x text").map(texts) if t != '0:00:00') == [
+        '1 day, 3:46:40', '2 days, 7:33:20', '3 days, 11:20:00',
+        '4 days, 15:06:40', '5 days, 18:53:20', '6 days, 22:40:00'
+    ]
 
 
 def test_date_xrange():
     """Test dateline with xrange"""
     datey = DateLine(truncate_label=1000)
-    datey.add('dates', [
-        (date(2013, 1, 2), 300),
-        (date(2013, 1, 12), 412),
-        (date(2013, 2, 2), 823),
-        (date(2013, 2, 22), 672)
-    ])
+    datey.add(
+        'dates', [(date(2013, 1, 2), 300), (date(2013, 1, 12), 412),
+                  (date(2013, 2, 2), 823), (date(2013, 2, 22), 672)]
+    )
 
     datey.xrange = (date(2013, 1, 1), date(2013, 3, 1))
 
     q = datey.render_pyquery()
-    assert list(
-        map(lambda t: t.split(' ')[0],
-            q(".axis.x text").map(texts))) == [
-                '2013-01-01',
-                '2013-01-12',
-                '2013-01-24',
-                '2013-02-04',
-                '2013-02-16',
-                '2013-02-27']
+    assert list(map(lambda t: t.split(' ')[0],
+                    q(".axis.x text").map(texts))) == [
+                        '2013-01-01', '2013-01-12', '2013-01-24', '2013-02-04',
+                        '2013-02-16', '2013-02-27'
+                    ]
 
 
 def test_date_labels():
     """Test dateline with xrange"""
     datey = DateLine(truncate_label=1000)
-    datey.add('dates', [
-        (date(2013, 1, 2), 300),
-        (date(2013, 1, 12), 412),
-        (date(2013, 2, 2), 823),
-        (date(2013, 2, 22), 672)
-    ])
-
-    datey.x_labels = [
-        date(2013, 1, 1),
-        date(2013, 2, 1),
-        date(2013, 3, 1)
-    ]
+    datey.add(
+        'dates', [(date(2013, 1, 2), 300), (date(2013, 1, 12), 412),
+                  (date(2013, 2, 2), 823), (date(2013, 2, 22), 672)]
+    )
+
+    datey.x_labels = [date(2013, 1, 1), date(2013, 2, 1), date(2013, 3, 1)]
 
     q = datey.render_pyquery()
-    assert list(
-        map(lambda t: t.split(' ')[0],
-            q(".axis.x text").map(texts))) == [
-                '2013-01-01',
-                '2013-02-01',
-                '2013-03-01']
+    assert list(map(lambda t: t.split(' ')[0],
+                    q(".axis.x text").map(texts))) == [
+                        '2013-01-01', '2013-02-01', '2013-03-01'
+                    ]
 
 
 def test_utc_timestamping():
-    assert timestamp(
-        datetime(2017, 7, 14, 2, 40).replace(tzinfo=utc)
-    ) == 1500000000
-
-    for d in (
-        datetime.now(),
-        datetime.utcnow(),
-        datetime(1999, 12, 31, 23, 59, 59),
-        datetime(2000, 1, 1, 0, 0, 0)
-    ):
-        assert datetime.utcfromtimestamp(
-            timestamp(d)) - d < timedelta(microseconds=10)
+    assert timestamp(datetime(2017, 7, 14, 2,
+                              40).replace(tzinfo=utc)) == 1500000000
+
+    for d in (datetime.now(), datetime.utcnow(), datetime(
+            1999, 12, 31, 23, 59, 59), datetime(2000, 1, 1, 0, 0, 0)):
+        assert datetime.utcfromtimestamp(timestamp(d)
+                                         ) - d < timedelta(microseconds=10)

pygal/test/test_formatters.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Test formatters"""
 
 from pygal import formatters

pygal/test/test_graph.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Generate tests for different chart types with different data"""
 
 import io
@@ -82,26 +81,44 @@ def test_metadata(Chart):
     """Test metadata values"""
     chart = Chart()
     v = range(7)
-    if Chart in (pygal.Box,):
+    if Chart in (pygal.Box, ):
         return  # summary charts cannot display per-value metadata
     elif Chart == pygal.XY:
         v = list(map(lambda x: (x, x + 1), v))
     elif issubclass(Chart, BaseMap):
-        v = [(k, i) for i, k in enumerate(Chart.x_labels) if k not in [
-            'oecd', 'nafta', 'eur']]
-
-    chart.add('Serie with metadata', [
-        v[0],
-        {'value': v[1]},
-        {'value': v[2], 'label': 'Three'},
-        {'value': v[3], 'xlink': 'http://4.example.com/'},
-        {'value': v[4], 'xlink': 'http://5.example.com/', 'label': 'Five'},
-        {'value': v[5], 'xlink': {
-            'href': 'http://6.example.com/'}, 'label': 'Six'},
-        {'value': v[6], 'xlink': {
-            'href': 'http://7.example.com/',
-            'target': '_blank'}, 'label': 'Seven'}
-    ])
+        v = [(k, i) for i, k in enumerate(Chart.x_labels)
+             if k not in ['oecd', 'nafta', 'eur']]
+
+    chart.add(
+        'Serie with metadata', [
+            v[0], {
+                'value': v[1]
+            }, {
+                'value': v[2],
+                'label': 'Three'
+            }, {
+                'value': v[3],
+                'xlink': 'http://4.example.com/'
+            }, {
+                'value': v[4],
+                'xlink': 'http://5.example.com/',
+                'label': 'Five'
+            }, {
+                'value': v[5],
+                'xlink': {
+                    'href': 'http://6.example.com/'
+                },
+                'label': 'Six'
+            }, {
+                'value': v[6],
+                'xlink': {
+                    'href': 'http://7.example.com/',
+                    'target': '_blank'
+                },
+                'label': 'Seven'
+            }
+        ]
+    )
     q = chart.render_pyquery()
     for md in ('Three', 'Five', 'Seven'):
         assert md in cut(q('desc'), 'text')
@@ -289,20 +306,22 @@ def test_no_data_with_lists_of_nones(Chart):
 def test_unicode_labels_decode(Chart):
     """Test unicode labels"""
     chart = Chart()
-    chart.add(u('Série1'), [{
-        'value': 1,
-        'xlink': 'http://1/',
-        'label': u('{\}°ijæð©&×&<—×€¿_…\{_…')
-    }, {
-        'value': 2,
-        'xlink': {
-            'href': 'http://6.example.com/'
-        },
-        'label': u('æ°€≠|€æ°€əæ')
-    }, {
-        'value': 3,
-        'label': 'unicode <3'
-    }])
+    chart.add(
+        u('Série1'), [{
+            'value': 1,
+            'xlink': 'http://1/',
+            'label': u('{\}°ijæð©&×&<—×€¿_…\{_…')
+        }, {
+            'value': 2,
+            'xlink': {
+                'href': 'http://6.example.com/'
+            },
+            'label': u('æ°€≠|€æ°€əæ')
+        }, {
+            'value': 3,
+            'label': 'unicode <3'
+        }]
+    )
     if not chart._dual:
         chart.x_labels = [u('&œ'), u('¿?'), u('††††††††'), 'unicode <3']
     chart.render_pyquery()
@@ -313,20 +332,22 @@ def test_unicode_labels_python2(Chart):
     if sys.version_info[0] == 3:
         return
     chart = Chart()
-    chart.add(u('Série1'), [{
-        'value': 1,
-        'xlink': 'http://1/',
-        'label': eval("u'{\}°ijæð©&×&<—×€¿_…\{_…'")
-    }, {
-        'value': 2,
-        'xlink': {
-            'href': 'http://6.example.com/'
-        },
-        'label': eval("u'æ°€≠|€æ°€əæ'")
-    }, {
-        'value': 3,
-        'label': eval("'unicode <3'")
-    }])
+    chart.add(
+        u('Série1'), [{
+            'value': 1,
+            'xlink': 'http://1/',
+            'label': eval("u'{\}°ijæð©&×&<—×€¿_…\{_…'")
+        }, {
+            'value': 2,
+            'xlink': {
+                'href': 'http://6.example.com/'
+            },
+            'label': eval("u'æ°€≠|€æ°€əæ'")
+        }, {
+            'value': 3,
+            'label': eval("'unicode <3'")
+        }]
+    )
     if not chart._dual:
         chart.x_labels = eval("[u'&œ', u'¿?', u'††††††††', 'unicode <3']")
     chart.render_pyquery()
@@ -337,20 +358,22 @@ def test_unicode_labels_python3(Chart):
     if sys.version_info[0] == 2:
         return
     chart = Chart()
-    chart.add(u('Série1'), [{
-        'value': 1,
-        'xlink': 'http://1/',
-        'label': eval("'{\}°ijæð©&×&<—×€¿_…\{_…'")
-    }, {
-        'value': 2,
-        'xlink': {
-            'href': 'http://6.example.com/'
-        },
-        'label': eval("'æ°€≠|€æ°€əæ'")
-    }, {
-        'value': 3,
-        'label': eval("b'unicode <3'")
-    }])
+    chart.add(
+        u('Série1'), [{
+            'value': 1,
+            'xlink': 'http://1/',
+            'label': eval("'{\}°ijæð©&×&<—×€¿_…\{_…'")
+        }, {
+            'value': 2,
+            'xlink': {
+                'href': 'http://6.example.com/'
+            },
+            'label': eval("'æ°€≠|€æ°€əæ'")
+        }, {
+            'value': 3,
+            'label': eval("b'unicode <3'")
+        }]
+    )
     if not chart._dual:
         chart.x_labels = eval("['&œ', '¿?', '††††††††', 'unicode <3']")
     chart.render_pyquery()
@@ -361,31 +384,49 @@ def test_labels_with_links(Chart):
     chart = Chart()
     # link on chart and label
     chart.add({
-        'title': 'Red', 'xlink': {'href': 'http://en.wikipedia.org/wiki/Red'}
+        'title': 'Red',
+        'xlink': {
+            'href': 'http://en.wikipedia.org/wiki/Red'
+        }
     }, [{
         'value': 2,
         'label': 'This is red',
-        'xlink': {'href': 'http://en.wikipedia.org/wiki/Red'}}])
+        'xlink': {
+            'href': 'http://en.wikipedia.org/wiki/Red'
+        }
+    }])
 
     # link on chart only
-    chart.add('Green', [{
-        'value': 4,
-        'label': 'This is green',
-        'xlink': {
-            'href': 'http://en.wikipedia.org/wiki/Green',
-            'target': '_top'}}])
+    chart.add(
+        'Green', [{
+            'value': 4,
+            'label': 'This is green',
+            'xlink': {
+                'href': 'http://en.wikipedia.org/wiki/Green',
+                'target': '_top'
+            }
+        }]
+    )
 
     # link on label only opens in new tab
-    chart.add({'title': 'Yellow', 'xlink': {
-        'href': 'http://en.wikipedia.org/wiki/Yellow',
-        'target': '_blank'}}, 7)
+    chart.add({
+        'title': 'Yellow',
+        'xlink': {
+            'href': 'http://en.wikipedia.org/wiki/Yellow',
+            'target': '_blank'
+        }
+    }, 7)
 
     # link on chart only
-    chart.add('Blue', [{
-        'value': 5,
-        'xlink': {
-            'href': 'http://en.wikipedia.org/wiki/Blue',
-            'target': '_blank'}}])
+    chart.add(
+        'Blue', [{
+            'value': 5,
+            'xlink': {
+                'href': 'http://en.wikipedia.org/wiki/Blue',
+                'target': '_blank'
+            }
+        }]
+    )
 
     # link on label and chart with diffrent behaviours
     chart.add({
@@ -396,7 +437,9 @@ def test_labels_with_links(Chart):
         'label': 'This is violet',
         'xlink': {
             'href': 'http://en.wikipedia.org/wiki/Violet_(color)',
-            'target': '_self'}}])
+            'target': '_self'
+        }
+    }])
 
     q = chart.render_pyquery()
     links = q('a')
@@ -416,9 +459,7 @@ def test_secondary(Chart):
     chart = Chart()
     rng = [83, .12, -34, 59]
     chart.add('First serie', rng)
-    chart.add('Secondary serie',
-              map(lambda x: x * 2, rng),
-              secondary=True)
+    chart.add('Secondary serie', map(lambda x: x * 2, rng), secondary=True)
     assert chart.render_pyquery()
 
 
@@ -436,7 +477,8 @@ def test_long_title(Chart, datas):
         "'the data is represented by symbols, such as bars in a bar chart, "
         "lines in a line chart, or slices in a pie chart'. A chart can "
         "represent tabular numeric data, functions or some kinds of "
-        "qualitative structure and provides different info.")
+        "qualitative structure and provides different info."
+    )
     chart = make_data(chart, datas)
     q = chart.render_pyquery()
     assert len(q('.titles text')) == 5

pygal/test/test_histogram.py

@@ -16,22 +16,15 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Histogram chart related tests"""
 
-
 from pygal import Histogram
 
 
 def test_histogram():
     """Simple histogram test"""
     hist = Histogram()
-    hist.add('1', [
-        (2, 0, 1),
-        (4, 1, 3),
-        (3, 3.5, 5),
-        (1.5, 5, 10)
-    ])
+    hist.add('1', [(2, 0, 1), (4, 1, 3), (3, 3.5, 5), (1.5, 5, 10)])
     hist.add('2', [(2, 2, 8)], secondary=True)
     q = hist.render_pyquery()
     assert len(q('.rect')) == 5

pygal/test/test_interpolate.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Interpolations tests"""
 
 from pygal.test import make_data
@@ -70,44 +69,75 @@ def test_hermite(Chart, datas):
 
 def test_hermite_finite(Chart, datas):
     """Test hermite finite difference interpolation"""
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={'type': 'finite_difference'})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'finite_difference'
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()
 
 
 def test_hermite_cardinal(Chart, datas):
     """Test hermite cardinal interpolation"""
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={'type': 'cardinal', 'c': .75})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'cardinal',
+            'c': .75
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()
 
 
 def test_hermite_catmull_rom(Chart, datas):
     """Test hermite catmull rom interpolation"""
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={'type': 'catmull_rom'})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'catmull_rom'
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()
 
 
 def test_hermite_kochanek_bartels(Chart, datas):
     """Test hermite kochanek bartels interpolation"""
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={
-                      'type': 'kochanek_bartels', 'b': -1, 'c': 1, 't': 1})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'kochanek_bartels',
+            'b': -1,
+            'c': 1,
+            't': 1
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()
 
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={
-                      'type': 'kochanek_bartels', 'b': -1, 'c': -8, 't': 0})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'kochanek_bartels',
+            'b': -1,
+            'c': -8,
+            't': 0
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()
 
-    chart = Chart(interpolate='hermite',
-                  interpolation_parameters={
-                      'type': 'kochanek_bartels', 'b': 0, 'c': 10, 't': -1})
+    chart = Chart(
+        interpolate='hermite',
+        interpolation_parameters={
+            'type': 'kochanek_bartels',
+            'b': 0,
+            'c': 10,
+            't': -1
+        }
+    )
     chart = make_data(chart, datas)
     assert chart.render()

pygal/test/test_line.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Line chart related tests"""
 
 from __future__ import division
@@ -45,11 +44,13 @@ def test_simple_line():
     assert len(q(".y.axis .guides")) == 13
     assert len(q(".dots")) == 3 * 13
     assert q(".axis.x text").map(texts) == [
-        '-30', '-25', '-20', '-15', '-10', '-5',
-        '0', '5', '10', '15', '20', '25', '30']
+        '-30', '-25', '-20', '-15', '-10', '-5', '0', '5', '10', '15', '20',
+        '25', '30'
+    ]
     assert q(".axis.y text").map(texts) == [
-        '-1.2', '-1', '-0.8', '-0.6', '-0.4', '-0.2',
-        '0', '0.2', '0.4', '0.6', '0.8', '1', '1.2']
+        '-1.2', '-1', '-0.8', '-0.6', '-0.4', '-0.2', '0', '0.2', '0.4', '0.6',
+        '0.8', '1', '1.2'
+    ]
     assert q(".title").text() == 'cos sin and cos - sin'
     assert q(".legend text").map(texts) == ['test1', 'test2', 'test3']
 
@@ -103,7 +104,8 @@ def test_not_equal_x_labels():
     assert len(q(".dots")) == 100
     assert len(q(".axis.x")) == 1
     assert q(".axis.x text").map(texts) == [
-        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10'
+    ]
 
 
 def test_int_x_labels():
@@ -116,7 +118,8 @@ def test_int_x_labels():
     assert len(q(".dots")) == 100
     assert len(q(".axis.x")) == 1
     assert q(".axis.x text").map(texts) == [
-        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10'
+    ]
 
 
 def test_only_major_dots_every():
@@ -148,7 +151,7 @@ def test_only_major_dots_count():
 
 def test_only_major_dots():
     """Test major dots with specified major labels"""
-    line = Line(show_only_major_dots=True,)
+    line = Line(show_only_major_dots=True, )
     line.add('test', range(12))
     line.x_labels = map(str, range(12))
     line.x_labels_major = ['1', '5', '11']
@@ -161,9 +164,7 @@ def test_line_secondary():
     line = Line()
     rng = [8, 12, 23, 73, 39, 57]
     line.add('First serie', rng)
-    line.add('Secondary serie',
-             map(lambda x: x * 2, rng),
-             secondary=True)
+    line.add('Secondary serie', map(lambda x: x * 2, rng), secondary=True)
     line.title = "One serie"
     q = line.render_pyquery()
     assert len(q(".axis.x")) == 0

pygal/test/test_maps.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Map plugins tests are imported here"""
 
 import pkg_resources

pygal/test/test_pie.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Donut chart related tests"""
 
 from pygal import Pie

pygal/test/test_serie_config.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Test per serie configuration"""
 
 from pygal import Line

pygal/test/test_sparktext.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Test sparktext rendering"""
 
 from pygal import Bar, Line

pygal/test/test_stacked.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Stacked chart related tests"""
 
 from pygal import StackedLine
@@ -29,7 +28,8 @@ def test_stacked_line():
     stacked.add('ten_twelve', [10, 12])
     q = stacked.render_pyquery()
     assert set([v.text for v in q("desc.value")]) == set(
-        ('1', '2', '11 (+10)', '14 (+12)'))
+        ('1', '2', '11 (+10)', '14 (+12)')
+    )
 
 
 def test_stacked_line_reverse():
@@ -39,7 +39,8 @@ def test_stacked_line_reverse():
     stacked.add('ten_twelve', [10, 12])
     q = stacked.render_pyquery()
     assert set([v.text for v in q("desc.value")]) == set(
-        ('11 (+1)', '14 (+2)', '10', '12'))
+        ('11 (+1)', '14 (+2)', '10', '12')
+    )
 
 
 def test_stacked_line_log():
@@ -49,7 +50,8 @@ def test_stacked_line_log():
     stacked.add('ten_twelve', [10, 12])
     q = stacked.render_pyquery()
     assert set([v.text for v in q("desc.value")]) == set(
-        ('1', '2', '11 (+10)', '14 (+12)'))
+        ('1', '2', '11 (+10)', '14 (+12)')
+    )
 
 
 def test_stacked_line_interpolate():
@@ -59,4 +61,5 @@ def test_stacked_line_interpolate():
     stacked.add('ten_twelve', [10, 12])
     q = stacked.render_pyquery()
     assert set([v.text for v in q("desc.value")]) == set(
-        ('1', '2', '11 (+10)', '14 (+12)'))
+        ('1', '2', '11 (+10)', '14 (+12)')
+    )

pygal/test/test_style.py

@@ -16,13 +16,13 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Style related tests"""
 
 from pygal import Line
 from pygal.style import (
     DarkenStyle, DesaturateStyle, LightenStyle, LightStyle, RotateStyle,
-    SaturateStyle)
+    SaturateStyle
+)
 
 STYLES = LightenStyle, DarkenStyle, SaturateStyle, DesaturateStyle, RotateStyle
 
@@ -41,8 +41,9 @@ def test_parametric_styles():
 
 def test_parametric_styles_with_parameters():
     """Test a parametric style with parameters"""
-    line = Line(style=RotateStyle(
-        '#de3804', step=12, max_=180, base_style=LightStyle))
+    line = Line(
+        style=RotateStyle('#de3804', step=12, max_=180, base_style=LightStyle)
+    )
     line.add('_', [1, 2, 3])
     line.x_labels = 'abc'
     assert line.render()

pygal/test/test_table.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Box chart related tests"""
 
 from pyquery import PyQuery as pq

pygal/test/test_util.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Utility functions tests"""
 
 import sys
@@ -26,7 +25,8 @@ from pytest import raises
 from pygal._compat import _ellipsis, u
 from pygal.util import (
     _swap_curly, majorize, mergextend, minify_css, round_to_float,
-    round_to_int, template, truncate)
+    round_to_int, template, truncate
+)
 
 
 def test_round_to_int():
@@ -54,11 +54,8 @@ def test_round_to_float():
 
 def test_swap_curly():
     """Test swap curly function"""
-    for str in (
-            'foo',
-            u('foo foo foo bar'),
-            'foo béè b¡ð/ijə˘©þß®~¯æ',
-            u('foo béè b¡ð/ijə˘©þß®~¯æ')):
+    for str in ('foo', u('foo foo foo bar'), 'foo béè b¡ð/ijə˘©þß®~¯æ',
+                u('foo béè b¡ð/ijə˘©þß®~¯æ')):
         assert _swap_curly(str) == str
     assert _swap_curly('foo{bar}baz') == 'foo{{bar}}baz'
     assert _swap_curly('foo{{bar}}baz') == 'foo{bar}baz'
@@ -80,13 +77,12 @@ def test_format():
 
     class Object(object):
         pass
+
     obj = Object()
     obj.a = 1
     obj.b = True
     obj.c = '3'
-    assert template(
-        'foo {{ o.a }} {{o.b}}-{{o.c}}',
-        o=obj) == 'foo 1 True-3'
+    assert template('foo {{ o.a }} {{o.b}}-{{o.c}}', o=obj) == 'foo 1 True-3'
 
 
 def test_truncate():
@@ -119,28 +115,29 @@ def test_minify_css():
 '''
     assert minify_css(css) == (
         '.title{font-family:sans;font-size:12}'
-        '.legends .legend text{font-family:monospace;font-size:14}')
+        '.legends .legend text{font-family:monospace;font-size:14}'
+    )
 
 
 def test_majorize():
     """Test majorize function"""
     assert majorize(()) == []
-    assert majorize((0,)) == []
+    assert majorize((0, )) == []
     assert majorize((0, 1)) == []
     assert majorize((0, 1, 2)) == []
     assert majorize((-1, 0, 1, 2)) == [0]
     assert majorize((0, .1, .2, .3, .4, .5, .6, .7, .8, .9, 1)) == [0, .5, 1]
     assert majorize((0, .2, .4, .6, .8, 1)) == [0, 1]
     assert majorize((-.4, -.2, 0, .2, .4, .6, .8, 1)) == [0, 1]
-    assert majorize(
-        (-1, -.8, -.6, -.4, -.2, 0, .2, .4, .6, .8, 1)) == [-1, 0, 1]
+    assert majorize((-1, -.8, -.6, -.4, -.2, 0, .2, .4, .6, .8,
+                     1)) == [-1, 0, 1]
     assert majorize((0, .2, .4, .6, .8, 1, 1.2, 1.4, 1.6)) == [0, 1]
     assert majorize((0, .2, .4, .6, .8, 1, 1.2, 1.4, 1.6, 1.8, 2)) == [0, 1, 2]
-    assert majorize(
-        (0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120)) == [0, 50, 100]
-    assert majorize(
-        (0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,
-         22, 24, 26, 28, 30, 32, 34, 36)) == [0, 10, 20, 30]
+    assert majorize((0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110,
+                     120)) == [0, 50, 100]
+    assert majorize((
+        0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36
+    )) == [0, 10, 20, 30]
     assert majorize((0, 1, 2, 3, 4, 5)) == [0, 5]
     assert majorize((-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5)) == [-5, 0, 5]
     assert majorize((-5, 5, -4, 4, 0, 1, -1, 3, -2, 2, -3)) == [-5, 0, 5]
@@ -167,10 +164,11 @@ def test_mergextend():
     assert mergextend([_ellipsis], ['c', 'd']) == ['c', 'd']
     assert mergextend([_ellipsis, 'b'], ['c', 'd']) == ['c', 'd', 'b']
     assert mergextend(['a', _ellipsis], ['c', 'd']) == ['a', 'c', 'd']
-    assert mergextend(['a', _ellipsis, 'b'], ['c', 'd']) == [
-        'a', 'c', 'd', 'b']
+    assert mergextend(['a', _ellipsis, 'b'],
+                      ['c', 'd']) == ['a', 'c', 'd', 'b']
 
     if sys.version_info[0] >= 3:
         # For @#! sake it's 2016 now
         assert eval("mergextend(['a', ..., 'b'], ['c', 'd'])") == [
-            'a', 'c', 'd', 'b']
+            'a', 'c', 'd', 'b'
+        ]

pygal/test/test_view.py

@@ -16,8 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
-
 """View related tests"""
 
 # TODO

pygal/test/test_xml_filters.py

@@ -16,14 +16,12 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Xml filter tests"""
 
 from pygal import Bar
 
 
 class ChangeBarsXMLFilter(object):
-
     """xml filter that insert a subplot"""
 
     def __init__(self, a, b):
@@ -32,8 +30,9 @@ class ChangeBarsXMLFilter(object):
 
     def __call__(self, T):
         """Apply the filter on the tree"""
-        subplot = Bar(legend_at_bottom=True, explicit_size=True,
-                      width=800, height=150)
+        subplot = Bar(
+            legend_at_bottom=True, explicit_size=True, width=800, height=150
+        )
         subplot.add("Difference", self.data)
         subplot = subplot.render_tree()
         subplot = subplot.findall("g")[0]
@@ -55,8 +54,9 @@ def test_xml_filters_round_trip():
 
 def test_xml_filters_change_bars():
     """Test the use a xml filter"""
-    plot = Bar(legend_at_bottom=True, explicit_size=True,
-               width=800, height=600)
+    plot = Bar(
+        legend_at_bottom=True, explicit_size=True, width=800, height=600
+    )
     A = [60, 75, 80, 78, 83, 90]
     B = [92, 87, 81, 73, 68, 55]
     plot.add("A", A)
@@ -64,5 +64,5 @@ def test_xml_filters_change_bars():
     plot.add_xml_filter(ChangeBarsXMLFilter(A, B))
     q = plot.render_tree()
     assert len(q.findall("g")) == 2
-    assert q.findall("g")[1].attrib[
-        "transform"] == "translate(0,150), scale(1,0.75)"
+    assert q.findall("g")[1].attrib["transform"
+                                    ] == "translate(0,150), scale(1,0.75)"

pygal/test/utils.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Tests helpers"""
 
 from pyquery import PyQuery as pq

pygal/util.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Various utility functions"""
 
 from __future__ import division
@@ -42,10 +41,10 @@ def majorize(values):
         return []
     values_step = sorted_values[1] - sorted_values[0]
     full_range = sorted_values[-1] - sorted_values[0]
-    step = 10 ** int(log10(full_range))
+    step = 10**int(log10(full_range))
     if step == values_step:
         step *= 10
-    step_factor = 10 ** (int(log10(step)) + 1)
+    step_factor = 10**(int(log10(step)) + 1)
     if round(step * step_factor) % (round(values_step * step_factor) or 1):
         # TODO: Find lower common multiple instead
         step *= values_step
@@ -54,7 +53,8 @@ def majorize(values):
     elif full_range >= 5 * step:
         step *= 5
     major_values = [
-        value for value in values if value / step == round(value / step)]
+        value for value in values if value / step == round(value / step)
+    ]
     return [value for value in sorted_values if value in major_values]
 
 
@@ -67,9 +67,8 @@ def round_to_int(number, precision):
 
 def round_to_float(number, precision):
     """Round a float to a precision"""
-    rounded = Decimal(
-        str(floor((number + precision / 2) // precision))
-    ) * Decimal(str(precision))
+    rounded = Decimal(str(floor((number + precision / 2) // precision))
+                      ) * Decimal(str(precision))
     return float(rounded)
 
 
@@ -101,15 +100,11 @@ def deg(radiants):
 
 def _swap_curly(string):
     """Swap single and double curly brackets"""
-    return (string
-            .replace('{{ ', '{{')
-            .replace('{{', '\x00')
-            .replace('{', '{{')
-            .replace('\x00', '{')
-            .replace(' }}', '}}')
-            .replace('}}', '\x00')
-            .replace('}', '}}')
-            .replace('\x00', '}'))
+    return (
+        string.replace('{{ ', '{{').replace('{{', '\x00').replace('{', '{{')
+        .replace('\x00', '{').replace(' }}', '}}').replace('}}', '\x00')
+        .replace('}', '}}').replace('\x00', '}')
+    )
 
 
 def template(string, **kwargs):
@@ -138,24 +133,21 @@ def compute_logarithmic_scale(min_, max_, min_scale, max_scale):
         detail /= 2
     for order in range(min_order, max_order + 1):
         for i in range(int(detail)):
-            tick = (10 * i / detail or 1) * 10 ** order
+            tick = (10 * i / detail or 1) * 10**order
             tick = round_to_scale(tick, tick)
             if min_ <= tick <= max_ and tick not in positions:
                 positions.append(tick)
     return positions
 
 
-def compute_scale(
-        min_, max_, logarithmic, order_min,
-        min_scale, max_scale):
+def compute_scale(min_, max_, logarithmic, order_min, min_scale, max_scale):
     """Compute an optimal scale between min and max"""
     if min_ == 0 and max_ == 0:
         return [0]
     if max_ - min_ == 0:
         return [min_]
     if logarithmic:
-        log_scale = compute_logarithmic_scale(
-            min_, max_, min_scale, max_scale)
+        log_scale = compute_logarithmic_scale(min_, max_, min_scale, max_scale)
         if log_scale:
             return log_scale
             # else we fallback to normal scalling
@@ -164,10 +156,10 @@ def compute_scale(
     if order_min is not None and order < order_min:
         order = order_min
     else:
-        while ((max_ - min_) / (10 ** order) < min_scale and
-               (order_min is None or order > order_min)):
+        while ((max_ - min_) / (10**order) < min_scale
+               and (order_min is None or order > order_min)):
             order -= 1
-    step = float(10 ** order)
+    step = float(10**order)
     while (max_ - min_) / step > max_scale:
         step *= 2.
     positions = []
@@ -213,24 +205,24 @@ def decorate(svg, node, metadata):
         if not isinstance(xlink, dict):
             xlink = {'href': xlink, 'target': '_blank'}
         node = svg.node(node, 'a', **xlink)
-        svg.node(node, 'desc', class_='xlink').text = to_unicode(
-            xlink.get('href'))
+        svg.node(
+            node, 'desc', class_='xlink'
+        ).text = to_unicode(xlink.get('href'))
 
     if 'tooltip' in metadata:
-        svg.node(node, 'title').text = to_unicode(
-            metadata['tooltip'])
+        svg.node(node, 'title').text = to_unicode(metadata['tooltip'])
 
     if 'color' in metadata:
         color = metadata.pop('color')
-        node.attrib['style'] = 'fill: %s; stroke: %s' % (
-            color, color)
+        node.attrib['style'] = 'fill: %s; stroke: %s' % (color, color)
 
     if 'style' in metadata:
         node.attrib['style'] = metadata.pop('style')
 
     if 'label' in metadata and metadata['label']:
-        svg.node(node, 'desc', class_='label').text = to_unicode(
-            metadata['label'])
+        svg.node(
+            node, 'desc', class_='label'
+        ).text = to_unicode(metadata['label'])
     return node
 
 
@@ -238,7 +230,8 @@ def alter(node, metadata):
     """Override nodes attributes from metadata node mapping"""
     if node is not None and metadata and 'node' in metadata:
         node.attrib.update(
-            dict((k, str(v)) for k, v in metadata['node'].items()))
+            dict((k, str(v)) for k, v in metadata['node'].items())
+        )
 
 
 def truncate(string, index):
@@ -250,7 +243,6 @@ def truncate(string, index):
 
 # # Stolen partly from brownie http://packages.python.org/Brownie/
 class cached_property(object):
-
     """Memoize a property"""
 
     def __init__(self, getter, doc=None):

pygal/view.py

@@ -16,7 +16,6 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-
 """Projection and bounding helpers"""
 
 from __future__ import division
@@ -25,7 +24,6 @@ from math import cos, log10, pi, sin
 
 
 class Margin(object):
-
     """Class reprensenting a margin (top, right, left, bottom)"""
 
     def __init__(self, top, right, bottom, left):
@@ -47,7 +45,6 @@ class Margin(object):
 
 
 class Box(object):
-
     """Chart boundings"""
 
     margin = .02
@@ -147,7 +144,6 @@ class Box(object):
 
 
 class View(object):
-
     """Projection base class"""
 
     def __init__(self, width, height, box):
@@ -167,8 +163,9 @@ class View(object):
         """Project y"""
         if y is None:
             return None
-        return (self.height - self.height *
-                (y - self.box.ymin) / self.box.height)
+        return (
+            self.height - self.height * (y - self.box.ymin) / self.box.height
+        )
 
     def __call__(self, xy):
         """Project x and y"""
@@ -177,7 +174,6 @@ class View(object):
 
 
 class ReverseView(View):
-
     """Same as view but reversed vertically"""
 
     def y(self, y):
@@ -188,7 +184,6 @@ class ReverseView(View):
 
 
 class HorizontalView(View):
-
     """Same as view but transposed"""
 
     def __init__(self, width, height, box):
@@ -219,7 +214,6 @@ class HorizontalView(View):
 
 
 class PolarView(View):
-
     """Polar projection for pie like graphs"""
 
     def __call__(self, rhotheta):
@@ -227,12 +221,11 @@ class PolarView(View):
         if None in rhotheta:
             return None, None
         rho, theta = rhotheta
-        return super(PolarView, self).__call__(
-            (rho * cos(theta), rho * sin(theta)))
+        return super(PolarView,
+                     self).__call__((rho * cos(theta), rho * sin(theta)))
 
 
 class PolarLogView(View):
-
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box):
@@ -240,7 +233,8 @@ class PolarLogView(View):
         super(PolarLogView, self).__init__(width, height, box)
         if not hasattr(box, '_rmin') or not hasattr(box, '_rmax'):
             raise Exception(
-                'Box must be set with set_polar_box for polar charts')
+                'Box must be set with set_polar_box for polar charts'
+            )
 
         self.log10_rmax = log10(self.box._rmax)
         self.log10_rmin = log10(self.box._rmin)
@@ -256,14 +250,13 @@ class PolarLogView(View):
         if rho == 0:
             return super(PolarLogView, self).__call__((0, 0))
         rho = (self.box._rmax - self.box._rmin) * (
-            log10(rho) - self.log10_rmin) / (
-            self.log10_rmax - self.log10_rmin)
-        return super(PolarLogView, self).__call__(
-            (rho * cos(theta), rho * sin(theta)))
+            log10(rho) - self.log10_rmin
+        ) / (self.log10_rmax - self.log10_rmin)
+        return super(PolarLogView,
+                     self).__call__((rho * cos(theta), rho * sin(theta)))
 
 
 class PolarThetaView(View):
-
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box, aperture=pi / 3):
@@ -272,7 +265,8 @@ class PolarThetaView(View):
         self.aperture = aperture
         if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
             raise Exception(
-                'Box must be set with set_polar_box for polar charts')
+                'Box must be set with set_polar_box for polar charts'
+            )
 
     def __call__(self, rhotheta):
         """Project rho and theta"""
@@ -280,15 +274,14 @@ class PolarThetaView(View):
             return None, None
         rho, theta = rhotheta
         start = 3 * pi / 2 + self.aperture / 2
-        theta = start + (2 * pi - self.aperture) * (
-            theta - self.box._tmin) / (
-                self.box._tmax - self.box._tmin)
-        return super(PolarThetaView, self).__call__(
-            (rho * cos(theta), rho * sin(theta)))
+        theta = start + (2 * pi - self.aperture) * (theta - self.box._tmin) / (
+            self.box._tmax - self.box._tmin
+        )
+        return super(PolarThetaView,
+                     self).__call__((rho * cos(theta), rho * sin(theta)))
 
 
 class PolarThetaLogView(View):
-
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box, aperture=pi / 3):
@@ -297,7 +290,8 @@ class PolarThetaLogView(View):
         self.aperture = aperture
         if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
             raise Exception(
-                'Box must be set with set_polar_box for polar charts')
+                'Box must be set with set_polar_box for polar charts'
+            )
         self.log10_tmax = log10(self.box._tmax) if self.box._tmax > 0 else 0
         self.log10_tmin = log10(self.box._tmin) if self.box._tmin > 0 else 0
         if self.log10_tmin == self.log10_tmax:
@@ -312,20 +306,19 @@ class PolarThetaLogView(View):
         if theta == 0:
             return super(PolarThetaLogView, self).__call__((0, 0))
         theta = self.box._tmin + (self.box._tmax - self.box._tmin) * (
-            log10(theta) - self.log10_tmin) / (
-            self.log10_tmax - self.log10_tmin)
+            log10(theta) - self.log10_tmin
+        ) / (self.log10_tmax - self.log10_tmin)
 
         start = 3 * pi / 2 + self.aperture / 2
-        theta = start + (2 * pi - self.aperture) * (
-            theta - self.box._tmin) / (
-                self.box._tmax - self.box._tmin)
+        theta = start + (2 * pi - self.aperture) * (theta - self.box._tmin) / (
+            self.box._tmax - self.box._tmin
+        )
 
-        return super(PolarThetaLogView, self).__call__(
-            (rho * cos(theta), rho * sin(theta)))
+        return super(PolarThetaLogView,
+                     self).__call__((rho * cos(theta), rho * sin(theta)))
 
 
 class LogView(View):
-
     """Y Logarithmic projection"""
 
     # Do not want to call the parent here
@@ -344,13 +337,13 @@ class LogView(View):
         """Project y"""
         if y is None or y <= 0 or self.log10_ymax - self.log10_ymin == 0:
             return 0
-        return (self.height - self.height *
-                (log10(y) - self.log10_ymin) / (
-                    self.log10_ymax - self.log10_ymin))
+        return (
+            self.height - self.height * (log10(y) - self.log10_ymin) /
+            (self.log10_ymax - self.log10_ymin)
+        )
 
 
 class XLogView(View):
-
     """X logarithmic projection"""
 
     # Do not want to call the parent here
@@ -367,13 +360,13 @@ class XLogView(View):
         """Project x"""
         if x is None or x <= 0 or self.log10_xmax - self.log10_xmin == 0:
             return None
-        return (self.width *
-                (log10(x) - self.log10_xmin) /
-                (self.log10_xmax - self.log10_xmin))
+        return (
+            self.width * (log10(x) - self.log10_xmin) /
+            (self.log10_xmax - self.log10_xmin)
+        )
 
 
 class XYLogView(XLogView, LogView):
-
     """X and Y logarithmic projection"""
 
     def __init__(self, width, height, box):
@@ -389,7 +382,6 @@ class XYLogView(XLogView, LogView):
 
 
 class HorizontalLogView(XLogView):
-
     """Transposed Logarithmic projection"""
 
     # Do not want to call the parent here