Document pygal.*

pygal/__init__.py

@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 """
-Main pygal package
+Main pygal package.
 
 This package holds all available charts in pygal, the Config class
 and the maps extensions namespace module.
@@ -76,16 +76,17 @@ CHARTS = list(CHARTS_BY_NAME.values())
 
 
 class PluginImportFixer(object):
-    """Allow external map plugins to be imported from pygal.maps package.
+
-       It is a ``sys.meta_path`` loader.
     """
+    Allow external map plugins to be imported from pygal.maps package.
 
-    def __init__(self):
+    It is a ``sys.meta_path`` loader.
-        pass
+    """
 
     def find_module(self, fullname, path=None):
-        """This method says if the module to load can be loaded by
+        """
-        the load_module function, that is here if it is a ``pygal.maps.*``
+        Tell if the module to load can be loaded by
+        the load_module function, ie: if it is a ``pygal.maps.*``
         module.
         """
         if fullname.startswith('pygal.maps.') and hasattr(
@@ -94,8 +95,10 @@ class PluginImportFixer(object):
         return None
 
     def load_module(self, name):
-        """Loads the ``pygal.maps.name`` module from
+        """
-        the previously loaded plugin"""
+        Load the ``pygal.maps.name`` module from the previously
+        loaded plugin
+        """
         if name not in sys.modules:
             sys.modules[name] = getattr(maps, name.split('.')[2])
         return sys.modules[name]

pygal/_compat.py

@@ -16,9 +16,7 @@
 #
 # 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 hacks for transparent python 2 / python 3 support"""
-Various hacks for transparent python 2 / python 3 support
-"""
 
 import sys
 from collections import Iterable
@@ -34,32 +32,38 @@ else:
 
 
 def is_list_like(value):
+    """Return whether value is an iterable but not a mapping / string"""
     return isinstance(value, Iterable) and not isinstance(value, (base, dict))
 
 
 def is_str(string):
+    """Return whether value is a string or a byte list"""
     return isinstance(string, base)
 
 
-def to_str(string):
+def to_str(obj):
-    if not is_str(string):
+    """Cast obj to unicode string"""
-        return coerce(string)
+    if not is_str(obj):
-    return string
+        return coerce(obj)
+    return obj
 
 
 def to_unicode(string):
+    """Force stirng to be a string in python 3 or a unicode in python 2"""
     if not isinstance(string, coerce):
         return string.decode('utf-8')
     return string
 
 
 def u(s):
+    """Emulate u'str' in python 2, do nothing in python 3"""
     if sys.version_info[0] == 2:
         return s.decode('utf-8')
     return s
 
 
 def total_seconds(td):
+    """Backport of `timedelta.total_second` function for python 2.6"""
     if sys.version_info[:2] == (2, 6):
         return (
             (td.days * 86400 + td.seconds) * 10 ** 6 + td.microseconds
@@ -68,6 +72,7 @@ def total_seconds(td):
 
 
 def timestamp(x):
+    """Get a timestamp from a date in python 3 and python 2"""
     if hasattr(x, 'timestamp'):
         from datetime import timezone
         if x.tzinfo is None:

pygal/adapters.py

@@ -16,10 +16,7 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-"""
+"""Value adapters to use when a chart doesn't accept all value types"""
-Value adapters to use when a chart doesn't accept all value types
-
-"""
 from decimal import Decimal
 
 

pygal/colors.py

@@ -119,9 +119,10 @@ def parse_color(color):
 
 
 def unparse_color(r, g, b, a, type):
-    """Take the r, g, b, a color values and give back
+    """
-    a type css color string. This is the inverse function of parse_color"""
+    Take the r, g, b, a color values and give back
-
+    a type css color string. This is the inverse function of parse_color
+    """
     if type == '#rgb':
         # Don't lose precision on rgb shortcut
         if r % 17 == 0 and g % 17 == 0 and b % 17 == 0:
@@ -168,7 +169,7 @@ def adjust(color, attribute, percent):
 
 
 def rotate(color, percent):
-    """Rotates a color by changing its hue value by percent"""
+    """Rotate a color by changing its hue value by percent"""
     return adjust(color, 0, percent)
 
 

pygal/config.py

@@ -16,10 +16,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
+"""Config module holding all options and their default values."""
 
-"""
-Config module holding all options and their default values.
-"""
 from copy import deepcopy
 from pygal.style import Style, DefaultStyle
 from pygal.interpolate import INTERPOLATIONS
@@ -29,6 +27,7 @@ CONFIG_ITEMS = []
 
 
 class Key(object):
+
     """
     Represents a config parameter.
 
@@ -45,7 +44,7 @@ class Key(object):
     def __init__(
             self, default_value, type_, category, doc,
             subdoc="", subtype=None):
-
+        """Create a configuration key"""
         self.value = default_value
         self.type = type_
         self.doc = doc
@@ -59,6 +58,10 @@ class Key(object):
         CONFIG_ITEMS.append(self)
 
     def __repr__(self):
+        """
+        Make a documentation repr.
+        This is a hack to generate doc from inner doc
+        """
         return """
         Type: %s%s     
         Default: %r     
@@ -120,10 +123,11 @@ class Key(object):
 
 
 class MetaConfig(type):
-    """
+
-    Metaclass for configs. Used to get the key name and set it on the value.
+    """Config metaclass. Used to get the key name and set it on the value."""
-    """
+
     def __new__(mcs, classname, bases, classdict):
+        """Get the name of the key and set it on the key"""
         for k, v in classdict.items():
             if isinstance(v, Key):
                 v.name = k
@@ -132,6 +136,7 @@ class MetaConfig(type):
 
 
 class BaseConfig(MetaConfig('ConfigBase', (object,), {})):
+
     """
     This class holds the common method for configs.
 
@@ -159,7 +164,7 @@ class BaseConfig(MetaConfig('ConfigBase', (object,), {})):
         self._update(kwargs)
 
     def _update(self, kwargs):
-        """Updates the config with the given dictionary"""
+        """Update the config with the given dictionary"""
         self.__dict__.update(
             dict([(k, v) for (k, v) in kwargs.items()
                   if not k.startswith('_') and k in dir(self)]))
@@ -182,6 +187,7 @@ class BaseConfig(MetaConfig('ConfigBase', (object,), {})):
 
 
 class CommonConfig(BaseConfig):
+
     """Class holding options used in both chart and serie configuration"""
 
     stroke = Key(
@@ -213,6 +219,7 @@ class CommonConfig(BaseConfig):
 
 
 class Config(CommonConfig):
+
     """Class holding config values"""
 
     style = Key(
@@ -496,6 +503,7 @@ class Config(CommonConfig):
 
 
 class SerieConfig(CommonConfig):
+
     """Class holding serie config values"""
 
     secondary = Key(

pygal/etree.py

@@ -25,9 +25,11 @@ import os
 
 
 class Etree(object):
+
     """Etree wrapper using lxml.etree or standard xml.etree"""
 
     def __init__(self):
+        """Create the wrapper"""
         from xml.etree import ElementTree as _py_etree
         self._py_etree = _py_etree
         try:
@@ -43,6 +45,7 @@ class Etree(object):
         self.lxml = self._etree is self._lxml_etree
 
     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__):
             return object.__getattribute__(self._etree, attr)

pygal/interpolate.py

@@ -33,7 +33,6 @@ def quadratic_interpolate(x, y, precision=250, **kwargs):
     Interpolate x, y using a quadratic algorithm
     https://en.wikipedia.org/wiki/Spline_(mathematics)
     """
-
     n = len(x) - 1
     delta_x = [x2 - x1 for x1, x2 in zip(x, x[1:])]
     delta_y = [y2 - y1 for y1, y2 in zip(y, y[1:])]

pygal/serie.py

@@ -16,16 +16,16 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-"""
+"""Serie property holder"""
-Little helpers for series
-
-"""
 from pygal.util import cached_property
 
 
 class Serie(object):
-    """Serie containing title, values and the graph serie index"""
+
+    """Serie class containing title, values and the graph serie index"""
+
     def __init__(self, index, title, values, config, metadata=None):
+        """Create the serie with its options"""
         self.index = index
         self.title = title
         self.values = values
@@ -35,4 +35,5 @@ class Serie(object):
 
     @cached_property
     def safe_values(self):
+        """Property containing all values that are not None"""
         return list(filter(lambda x: x is not None, self.values))

pygal/state.py

@@ -16,14 +16,20 @@
 #
 # 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
 
-"""
+"""Class holding state during render"""
 
 
 class State(object):
+
+    """
+    Class containing config values
+    overriden by chart values
+    overriden by keyword args
+    """
+
     def __init__(self, graph, **kwargs):
+        """Create the transient state"""
         self.__dict__.update(**graph.config.__dict__)
         self.__dict__.update(**graph.__dict__)
         self.__dict__.update(**kwargs)

pygal/style.py

@@ -16,9 +16,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-"""
+"""Charts styling classes"""
-Charts styling
+
-"""
 from __future__ import division
 from pygal.util import cycle_fill
 from pygal import colors
@@ -27,7 +26,9 @@ import sys
 
 
 class Style(object):
+
     """Styling class containing colors for the css generation"""
+
     def __init__(
             self,
             background='black',
@@ -45,6 +46,7 @@ class Style(object):
                 '#899ca1', '#f8f8f2', '#bf4646', '#516083', '#f92672',
                 '#82b414', '#fd971f', '#56c2d6', '#808384', '#8c54fe',
                 '#465457')):
+        """Create the style"""
         self.background = background
         self.plot_background = plot_background
         self.foreground = foreground
@@ -58,7 +60,6 @@ class Style(object):
 
     def get_colors(self, prefix, len_):
         """Get the css color list"""
-
         def color(tupl):
             """Make a color css"""
             return ((
@@ -75,6 +76,7 @@ class Style(object):
         return '\n'.join(map(color, enumerate(colors)))
 
     def to_dict(self):
+        """Convert instance to a serializable mapping."""
         config = {}
         for attr in dir(self):
             if not attr.startswith('__'):
@@ -296,10 +298,23 @@ for op in ('lighten', 'darken', 'saturate', 'desaturate', 'rotate'):
     name = op.capitalize() + 'Style'
 
     def get_style_for(op_name):
+        """
+        Return a callable that returns a Style instance
+        for the given operation
+        """
         operation = getattr(colors, op_name)
 
         def parametric_style(color, step=10, max_=None, base_style=None,
                              **kwargs):
+            """
+            Generate a parametric Style instance of the parametric operation
+            This takes several parameters:
+             * a `step` which correspond on how many colors will be needed
+             * a `max_` which defines the maximum amplitude of the color effect
+             * a `base_style` which will be taken as default for everything
+               except colors
+             * any keyword arguments setting other style parameters
+            """
             if max_ is None:
                 violency = {
                     'darken': 50,

pygal/svg.py

@@ -16,10 +16,8 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-"""
-Svg helper
 
-"""
+"""Svg helper"""
 
 from __future__ import division
 from pygal._compat import to_str, u
@@ -35,11 +33,14 @@ from pygal import __version__
 
 
 class Svg(object):
-    """Svg object"""
+
+    """Svg related methods"""
+
     ns = 'http://www.w3.org/2000/svg'
     xlink_ns = 'http://www.w3.org/1999/xlink'
 
     def __init__(self, graph):
+        """Create the svg helper with the chart instance"""
         self.graph = graph
         if not graph.no_prefix:
             self.id = '#chart-%s ' % graph.uuid
@@ -98,7 +99,9 @@ class Svg(object):
                             os.path.dirname(__file__), 'css', css)
 
                     class FontSizes(object):
+
                         """Container for font sizes"""
+
                     fs = FontSizes()
                     for name in dir(self.graph.state):
                         if name.endswith('_font_size'):
@@ -286,6 +289,7 @@ class Svg(object):
             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,
@@ -314,7 +318,9 @@ class Svg(object):
         return svg
 
     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',

pygal/table.py

@@ -17,8 +17,9 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 """
-Table maker
+HTML Table maker.
 
+This class is used to render an html table from a chart data.
 """
 
 from pygal.util import template
@@ -27,18 +28,32 @@ import uuid
 
 
 class HTML(object):
+
+    """Lower case adapter of lxml builder"""
+
     def __getattribute__(self, attr):
+        """Get the uppercase builder attribute"""
         return getattr(builder, attr.upper())
 
 
 class Table(object):
+
+    """Table generator class"""
+
     _dual = None
 
     def __init__(self, chart):
-        "Init the table"
+        """Init the table"""
         self.chart = chart
 
     def render(self, total=False, transpose=False, style=False):
+        """Render the HTMTL table of the chart.
+
+        `total` can be specified to include data sums
+        `transpose` make labels becomes columns
+        `style` include scoped style for the table
+
+        """
         self.chart.setup()
         ln = self.chart._len
         fmt = self.chart._format

pygal/util.py

@@ -16,10 +16,9 @@
 #
 # 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 utils
 
-"""
+"""Various utility functions"""
+
 from __future__ import division
 from pygal._compat import u, is_list_like, to_unicode
 import re
@@ -250,6 +249,7 @@ def decorate(svg, node, metadata):
 
 
 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()))
@@ -273,14 +273,21 @@ def truncate(string, index):
 
 # # Stolen partly from brownie http://packages.python.org/Brownie/
 class cached_property(object):
-    """Optimize a static property"""
+
+    """Memoize a property"""
+
     def __init__(self, getter, doc=None):
+        """Initialize the decorator"""
         self.getter = getter
         self.__module__ = getter.__module__
         self.__name__ = getter.__name__
         self.__doc__ = doc or getter.__doc__
 
     def __get__(self, obj, type_=None):
+        """
+        Get descriptor calling the property function and replacing it with
+        its value or on state if we are in the transient state.
+        """
         if obj is None:
             return self
         value = self.getter(obj)
@@ -294,6 +301,7 @@ css_comments = re.compile(r'/\*.*?\*/', re.MULTILINE | re.DOTALL)
 
 
 def minify_css(css):
+    """Little css minifier"""
     # Inspired by slimmer by Peter Bengtsson
     remove_next_comment = 1
     for css_comment in css_comments.findall(css):
@@ -328,12 +336,14 @@ def compose(f, g):
 
 
 def safe_enumerate(iterable):
+    """Enumerate which does not yield None values"""
     for i, v in enumerate(iterable):
         if v is not None:
             yield i, v
 
 
 def split_title(title, width, title_fs):
+    """Split a string for a specified width and font size"""
     titles = []
     if not title:
         return titles

pygal/view.py

@@ -16,17 +16,19 @@
 #
 # 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
+"""Projection and bounding helpers"""
-"""
 
 from __future__ import division
 from math import sin, cos, log10, pi
 
 
 class Margin(object):
-    """Graph margin"""
+
+    """Class reprensenting a margin (top, right, left, bottom)"""
+
     def __init__(self, top, right, bottom, left):
+        """Create the margin object from the top, right, left, bottom margin"""
         self.top = top
         self.right = right
         self.bottom = bottom
@@ -44,16 +46,23 @@ class Margin(object):
 
 
 class Box(object):
+
     """Chart boundings"""
+
     margin = .02
 
     def __init__(self, xmin=0, ymin=0, xmax=1, ymax=1):
+        """
+        Create the chart bounds with min max horizontal
+        and vertical values
+        """
         self._xmin = xmin
         self._ymin = ymin
         self._xmax = xmax
         self._ymax = ymax
 
     def set_polar_box(self, rmin=0, rmax=1, tmin=0, tmax=2 * pi):
+        """Helper for polar charts"""
         self._rmin = rmin
         self._rmax = rmax
         self._tmin = tmin
@@ -63,37 +72,45 @@ class Box(object):
 
     @property
     def xmin(self):
+        """X minimum getter"""
         return self._xmin
 
     @xmin.setter
     def xmin(self, value):
+        """X minimum setter"""
         if value:
             self._xmin = value
 
     @property
     def ymin(self):
+        """Y minimum getter"""
         return self._ymin
 
     @ymin.setter
     def ymin(self, value):
+        """Y minimum setter"""
         if value:
             self._ymin = value
 
     @property
     def xmax(self):
+        """X maximum getter"""
         return self._xmax
 
     @xmax.setter
     def xmax(self, value):
+        """X maximum setter"""
         if value:
             self._xmax = value
 
     @property
     def ymax(self):
+        """Y maximum getter"""
         return self._ymax
 
     @ymax.setter
     def ymax(self, value):
+        """Y maximum setter"""
         if value:
             self._ymax = value
 
@@ -129,8 +146,11 @@ class Box(object):
 
 
 class View(object):
+
     """Projection base class"""
+
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self.width = width
         self.height = height
         self.box = box
@@ -156,14 +176,22 @@ class View(object):
 
 
 class ReverseView(View):
+
+    """Same as view but reversed vertically"""
+
     def y(self, y):
+        """Project reversed y"""
         if y is None:
             return None
         return (self.height * (y - self.box.ymin) / self.box.height)
 
 
 class HorizontalView(View):
+
+    """Same as view but transposed"""
+
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self._force_vertical = None
         self.width = width
         self.height = height
@@ -173,7 +201,7 @@ class HorizontalView(View):
         self.box.swap()
 
     def x(self, x):
-        """Project x"""
+        """Project x as y"""
         if x is None:
             return None
         if self._force_vertical:
@@ -181,6 +209,7 @@ class HorizontalView(View):
         return super(HorizontalView, self).y(x)
 
     def y(self, y):
+        """Project y as x"""
         if y is None:
             return None
         if self._force_vertical:
@@ -189,6 +218,7 @@ class HorizontalView(View):
 
 
 class PolarView(View):
+
     """Polar projection for pie like graphs"""
 
     def __call__(self, rhotheta):
@@ -201,9 +231,11 @@ class PolarView(View):
 
 
 class PolarLogView(View):
+
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         super(PolarLogView, self).__init__(width, height, box)
         if not hasattr(box, '_rmin') or not hasattr(box, '_rmax'):
             raise Exception(
@@ -230,9 +262,11 @@ class PolarLogView(View):
 
 
 class PolarThetaView(View):
+
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box, aperture=pi / 3):
+        """Create the view with a width an height and a box bounds"""
         super(PolarThetaView, self).__init__(width, height, box)
         self.aperture = aperture
         if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
@@ -253,9 +287,11 @@ class PolarThetaView(View):
 
 
 class PolarThetaLogView(View):
+
     """Logarithmic polar projection"""
 
     def __init__(self, width, height, box, aperture=pi / 3):
+        """Create the view with a width an height and a box bounds"""
         super(PolarThetaLogView, self).__init__(width, height, box)
         self.aperture = aperture
         if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
@@ -288,9 +324,12 @@ class PolarThetaLogView(View):
 
 
 class LogView(View):
-    """Logarithmic projection """
+
+    """Y Logarithmic projection"""
+
     # Do not want to call the parent here
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self.width = width
         self.height = height
         self.box = box
@@ -310,9 +349,12 @@ class LogView(View):
 
 
 class XLogView(View):
-    """Logarithmic projection """
+
+    """X logarithmic projection"""
+
     # Do not want to call the parent here
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self.width = width
         self.height = height
         self.box = box
@@ -330,7 +372,11 @@ class XLogView(View):
 
 
 class XYLogView(XLogView, LogView):
+
+    """X and Y logarithmic projection"""
+
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self.width = width
         self.height = height
         self.box = box
@@ -342,9 +388,12 @@ class XYLogView(XLogView, LogView):
 
 
 class HorizontalLogView(XLogView):
-    """Logarithmic projection """
+
+    """Transposed Logarithmic projection"""
+
     # Do not want to call the parent here
     def __init__(self, width, height, box):
+        """Create the view with a width an height and a box bounds"""
         self._force_vertical = None
         self.width = width
         self.height = height
@@ -357,7 +406,7 @@ class HorizontalLogView(XLogView):
         self.box.swap()
 
     def x(self, x):
-        """Project x"""
+        """Project x as y"""
         if x is None:
             return None
         if self._force_vertical:
@@ -365,6 +414,7 @@ class HorizontalLogView(XLogView):
         return super(XLogView, self).y(x)
 
     def y(self, y):
+        """Project y as x"""
         if y is None:
             return None
         if self._force_vertical: