diff --git a/pygal/__init__.py b/pygal/__init__.py
index 4eb6fd9..30e48e7 100644
--- a/pygal/__init__.py
+++ b/pygal/__init__.py
@@ -26,6 +26,11 @@ and the maps extensions namespace module.
 
 __version__ = '1.9.9'
 
+import pkg_resources
+import sys
+import traceback
+import warnings
+
 from pygal.graph.bar import Bar
 from pygal.graph.box import Box
 from pygal.graph.dot import Dot
@@ -46,10 +51,6 @@ from pygal.graph.xy import XY
 from pygal.graph.graph import Graph
 from pygal.config import Config
 from pygal import maps
-import pkg_resources
-import sys
-import traceback
-import warnings
 
 
 CHARTS_BY_NAME = dict(
diff --git a/pygal/config.py b/pygal/config.py
index ce56616..324e0a1 100644
--- a/pygal/config.py
+++ b/pygal/config.py
@@ -19,8 +19,9 @@
 """Config module holding all options and their default values."""
 
 from copy import deepcopy
-from pygal.style import Style, DefaultStyle
+
 from pygal.interpolate import INTERPOLATIONS
+from pygal.style import DefaultStyle, Style
 
 
 CONFIG_ITEMS = []
diff --git a/pygal/graph/bar.py b/pygal/graph/bar.py
index 8e56719..0126d0e 100644
--- a/pygal/graph/bar.py
+++ b/pygal/graph/bar.py
@@ -23,8 +23,9 @@ proportional to the values that they represent.
 """
 
 from __future__ import division
+
 from pygal.graph.graph import Graph
-from pygal.util import swap, ident, decorate, alter
+from pygal.util import alter, decorate, ident, swap
 
 
 class Bar(Graph):
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 7848fb3..edbc025 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -20,19 +20,19 @@
 """Base for pygal charts"""
 
 from __future__ import division
+
+import os
+from functools import reduce
+from uuid import uuid4
+
 from pygal._compat import is_list_like
-from pygal.view import Margin, Box
-from pygal.config import Config
+from pygal.adapters import decimal_to_float, not_zero, positive
+from pygal.config import Config, SerieConfig
+from pygal.serie import Serie
 from pygal.state import State
-from pygal.util import compose, ident
 from pygal.svg import Svg
-from pygal.serie import Serie
-from pygal.config import SerieConfig
-from pygal.adapters import (
-    not_zero, positive, decimal_to_float)
-from functools import reduce
-from uuid import uuid4
-import os
+from pygal.util import compose, ident
+from pygal.view import Box, Margin
 
 
 class BaseGraph(object):
diff --git a/pygal/graph/box.py b/pygal/graph/box.py
index 2629f4e..5ccda59 100644
--- a/pygal/graph/box.py
+++ b/pygal/graph/box.py
@@ -23,11 +23,13 @@ Different types are available throught the box_mode option
 """
 
 from __future__ import division
-from pygal.graph.graph import Graph
-from pygal.util import compute_scale, decorate, alter
-from pygal._compat import is_list_like
+
 from bisect import bisect_left, bisect_right
 
+from pygal._compat import is_list_like
+from pygal.graph.graph import Graph
+from pygal.util import alter, decorate
+
 
 class Box(Graph):
 
diff --git a/pygal/graph/dual.py b/pygal/graph/dual.py
index 6ed3be0..5c50292 100644
--- a/pygal/graph/dual.py
+++ b/pygal/graph/dual.py
@@ -19,9 +19,9 @@
 
 """Dual chart base. Dual means a chart with 2 scaled axis like xy"""
 
-from pygal.util import cut, compute_scale
 from pygal._compat import is_str
 from pygal.graph.graph import Graph
+from pygal.util import compute_scale, cut
 
 
 class Dual(Graph):
diff --git a/pygal/graph/funnel.py b/pygal/graph/funnel.py
index 73b47d8..82f4074 100644
--- a/pygal/graph/funnel.py
+++ b/pygal/graph/funnel.py
@@ -19,9 +19,10 @@
 """Funnel chart: Represent values as a funnel"""
 
 from __future__ import division
-from pygal.util import decorate, cut, compute_scale, alter
-from pygal.adapters import positive, none_to_zero
+
+from pygal.adapters import none_to_zero, positive
 from pygal.graph.graph import Graph
+from pygal.util import alter, cut, decorate
 
 
 class Funnel(Graph):
diff --git a/pygal/graph/gauge.py b/pygal/graph/gauge.py
index 01a3060..325cc17 100644
--- a/pygal/graph/gauge.py
+++ b/pygal/graph/gauge.py
@@ -20,10 +20,11 @@
 """Gauge chart representing values as needles on a polar scale"""
 
 from __future__ import division
+
 from pygal._compat import is_str
-from pygal.util import decorate, compute_scale, alter, cut
-from pygal.view import PolarThetaView, PolarThetaLogView
 from pygal.graph.graph import Graph
+from pygal.util import alter, compute_scale, cut, decorate
+from pygal.view import PolarThetaLogView, PolarThetaView
 
 
 class Gauge(Graph):
diff --git a/pygal/graph/graph.py b/pygal/graph/graph.py
index 53b7ca7..0b114d1 100644
--- a/pygal/graph/graph.py
+++ b/pygal/graph/graph.py
@@ -19,16 +19,19 @@
 """Chart properties and drawing"""
 
 from __future__ import division
+
+from itertools import chain, repeat
+
+from math import ceil, cos, sin, sqrt
+
 from pygal._compat import is_list_like, is_str
-from pygal.interpolate import INTERPOLATIONS
 from pygal.graph.public import PublicApi
-from pygal.view import View, LogView, XYLogView, ReverseView
+from pygal.interpolate import INTERPOLATIONS
 from pygal.util import (
-    cached_property, majorize, humanize, split_title, compute_scale,
-    truncate, reverse_text_len, get_text_box, get_texts_box, cut, rad,
-    decorate)
-from math import sqrt, ceil, cos, sin
-from itertools import repeat, chain
+    cached_property, compute_scale, cut, decorate,
+    get_text_box, get_texts_box, humanize, majorize, rad, reverse_text_len,
+    split_title, truncate)
+from pygal.view import LogView, ReverseView, View, XYLogView
 
 
 class Graph(PublicApi):
diff --git a/pygal/graph/horizontal.py b/pygal/graph/horizontal.py
index 74694a4..76b6bbc 100644
--- a/pygal/graph/horizontal.py
+++ b/pygal/graph/horizontal.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/>.
 """Horizontal graph mixin"""
+
 from pygal.graph.graph import Graph
-from pygal.view import HorizontalView, HorizontalLogView
+from pygal.view import HorizontalLogView, HorizontalView
 
 
 class HorizontalGraph(Graph):
diff --git a/pygal/graph/horizontalbar.py b/pygal/graph/horizontalbar.py
index 56ffeec..13068b3 100644
--- a/pygal/graph/horizontalbar.py
+++ b/pygal/graph/horizontalbar.py
@@ -19,8 +19,8 @@
 
 """Horizontal bar graph"""
 
-from pygal.graph.horizontal import HorizontalGraph
 from pygal.graph.bar import Bar
+from pygal.graph.horizontal import HorizontalGraph
 
 
 class HorizontalBar(HorizontalGraph, Bar):
diff --git a/pygal/graph/pie.py b/pygal/graph/pie.py
index edd8fc7..980c46f 100644
--- a/pygal/graph/pie.py
+++ b/pygal/graph/pie.py
@@ -22,11 +22,13 @@ It can be made as a donut or a half pie.
 """
 
 from __future__ import division
-from pygal.util import decorate, alter
-from pygal.graph.graph import Graph
-from pygal.adapters import positive, none_to_zero
+
 from math import pi
 
+from pygal.adapters import none_to_zero, positive
+from pygal.graph.graph import Graph
+from pygal.util import alter, decorate
+
 
 class Pie(Graph):
 
diff --git a/pygal/graph/public.py b/pygal/graph/public.py
index 165ecc6..b5100db 100644
--- a/pygal/graph/public.py
+++ b/pygal/graph/public.py
@@ -18,10 +18,11 @@
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
 """pygal public api functions"""
 
+import base64
 import io
-from pygal._compat import u, is_list_like
+
+from pygal._compat import is_list_like, u
 from pygal.graph.base import BaseGraph
-import base64
 
 
 class PublicApi(BaseGraph):
diff --git a/pygal/graph/radar.py b/pygal/graph/radar.py
index 0815e85..b7bce51 100644
--- a/pygal/graph/radar.py
+++ b/pygal/graph/radar.py
@@ -23,13 +23,15 @@ useful for multivariate observation.
 """
 
 from __future__ import division
-from pygal.graph.line import Line
-from pygal.adapters import positive, none_to_zero
-from pygal.view import PolarView, PolarLogView
-from pygal.util import deg, cached_property, compute_scale, majorize, cut
-from pygal._compat import is_str
+
 from math import cos, pi
 
+from pygal._compat import is_str
+from pygal.adapters import none_to_zero, positive
+from pygal.graph.line import Line
+from pygal.util import cached_property, compute_scale, cut, deg, majorize
+from pygal.view import PolarLogView, PolarView
+
 
 class Radar(Line):
 
diff --git a/pygal/graph/stackedline.py b/pygal/graph/stackedline.py
index d48b233..3083628 100644
--- a/pygal/graph/stackedline.py
+++ b/pygal/graph/stackedline.py
@@ -23,8 +23,9 @@ on top of the others. Used along fill=True option.
 """
 
 from __future__ import division
-from pygal.graph.line import Line
+
 from pygal.adapters import none_to_zero
+from pygal.graph.line import Line
 
 
 class StackedLine(Line):
diff --git a/pygal/graph/time.py b/pygal/graph/time.py
index 1ad22f8..e6f4d21 100644
--- a/pygal/graph/time.py
+++ b/pygal/graph/time.py
@@ -22,10 +22,11 @@ XY time extensions: handle convertion of date, time, datetime, timedelta
 into float for xy plot and back to their type for display
 """
 
+from datetime import date, datetime, time, timedelta
+
+from pygal._compat import is_str, timestamp, total_seconds
 from pygal.adapters import positive
 from pygal.graph.xy import XY
-from datetime import datetime, date, time, timedelta
-from pygal._compat import timestamp, total_seconds, is_str
 
 
 def datetime_to_timestamp(x):
diff --git a/pygal/graph/treemap.py b/pygal/graph/treemap.py
index 81ee7b1..60f746a 100644
--- a/pygal/graph/treemap.py
+++ b/pygal/graph/treemap.py
@@ -20,9 +20,10 @@
 """Treemap chart: Visualize data using nested recangles"""
 
 from __future__ import division
-from pygal.util import decorate, cut, alter
+
+from pygal.adapters import none_to_zero, positive
 from pygal.graph.graph import Graph
-from pygal.adapters import positive, none_to_zero
+from pygal.util import alter, cut, decorate
 
 
 class Treemap(Graph):
diff --git a/pygal/interpolate.py b/pygal/interpolate.py
index 241f0b9..830acb7 100644
--- a/pygal/interpolate.py
+++ b/pygal/interpolate.py
@@ -25,6 +25,7 @@ with `precision` interpolated points between each of them
 
 """
 from __future__ import division
+
 from math import sin
 
 
diff --git a/pygal/serie.py b/pygal/serie.py
index e5b105c..9405802 100644
--- a/pygal/serie.py
+++ b/pygal/serie.py
@@ -17,6 +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/>.
 """Serie property holder"""
+
 from pygal.util import cached_property
 
 
diff --git a/pygal/style.py b/pygal/style.py
index fa08f36..c5a7d46 100644
--- a/pygal/style.py
+++ b/pygal/style.py
@@ -19,9 +19,11 @@
 """Charts styling classes"""
 
 from __future__ import division
+
 from itertools import chain
+
 from pygal import colors
-from pygal.colors import darken, lighten, is_foreground_light
+from pygal.colors import darken, is_foreground_light, lighten
 
 
 class Style(object):
diff --git a/pygal/table.py b/pygal/table.py
index c32168d..84cf692 100644
--- a/pygal/table.py
+++ b/pygal/table.py
@@ -22,9 +22,10 @@ HTML Table maker.
 This class is used to render an html table from a chart data.
 """
 
-from pygal.util import template
-from lxml.html import builder, tostring
 import uuid
+from lxml.html import builder, tostring
+
+from pygal.util import template
 
 
 class HTML(object):
diff --git a/pygal/util.py b/pygal/util.py
index 8a1d86a..4b92012 100644
--- a/pygal/util.py
+++ b/pygal/util.py
@@ -20,10 +20,15 @@
 """Various utility functions"""
 
 from __future__ import division
-from pygal._compat import u, is_list_like, to_unicode
+
 import re
 from decimal import Decimal
-from math import floor, pi, log, log10, ceil
+
+from math import ceil, floor, log, log10, pi
+
+from pygal._compat import is_list_like, to_unicode, u
+
+
 ORDERS = u("yzafpnµm kMGTPEZY")
 
 
diff --git a/pygal/view.py b/pygal/view.py
index a1c74b8..7a0688e 100644
--- a/pygal/view.py
+++ b/pygal/view.py
@@ -20,7 +20,8 @@
 """Projection and bounding helpers"""
 
 from __future__ import division
-from math import sin, cos, log10, pi
+
+from math import cos, log10, pi, sin
 
 
 class Margin(object):