diff --git a/.gitignore b/.gitignore
index 571ce43..b57ef54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.svg
 .livereload
 dist
+.tox
diff --git a/pygal/graph/bar.py b/pygal/graph/bar.py
index 43fda70..e5419e4 100644
--- a/pygal/graph/bar.py
+++ b/pygal/graph/bar.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.graph import Graph
 from pygal.util import swap, ident
 
@@ -78,7 +79,7 @@ class Bar(Graph):
                 class_='rect reactive tooltip-trigger')
             self.svg.node(bar, 'desc', class_="values").text = val
             tooltip_positions = map(
-                str, (x + bar_inner_width / 2., y + height / 2.))
+                str, (x + bar_inner_width / 2, y + height / 2))
             self.svg.node(bar, 'desc',
                           class_="x centered"
             ).text = tooltip_positions[int(self._horizontal)]
@@ -103,14 +104,14 @@ class Bar(Graph):
         self._box.ymin = min(min(self._values), self.zero)
         self._box.ymax = max(max(self._values), self.zero)
         x_step = len(self.series[0].values)
-        x_pos = [x / float(x_step) for x in range(x_step + 1)
+        x_pos = [x / x_step for x in range(x_step + 1)
         ] if x_step > 1 else [0, 1]  # Center if only one value
         y_pos = self._compute_scale(self._box.ymin, self._box.ymax,
         ) if not self.y_labels else map(float, self.y_labels)
 
         self._x_ranges = zip(x_pos, x_pos[1:])
         self._x_labels = self.x_labels and zip(self.x_labels, [
-            sum(x_range) / 2. for x_range in self._x_ranges])
+            sum(x_range) / 2 for x_range in self._x_ranges])
         self._y_labels = zip(map(self.format, y_pos), y_pos)
 
     def _plot(self):
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 01fa5a5..1bccf3e 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -1,3 +1,23 @@
+# -*- coding: utf-8 -*-
+# This file is part of pygal
+#
+# A python svg graph plotting library
+# Copyright © 2012 Kozea
+#
+# This library is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# 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 __future__ import division
+import io
 from pygal.serie import Serie
 from pygal.view import Margin, Box
 from pygal.util import round_to_scale, cut, rad, humanize
@@ -44,7 +64,7 @@ class BaseGraph(object):
             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)
@@ -61,7 +81,7 @@ class BaseGraph(object):
                 return log_scale
                 # else we fallback to normal scalling
         order = round(log10(max(abs(min_), abs(max_)))) - 1
-        while (max_ - min_) / float(10 ** order) < min_scale:
+        while (max_ - min_) / (10 ** order) < min_scale:
             order -= 1
         step = float(10 ** order)
         while (max_ - min_) / step > max_scale:
@@ -159,9 +179,9 @@ class BaseGraph(object):
         else:
             self.svg._pre_render(True)
 
-    def render(self):
+    def render(self, is_unicode=False):
         self._render()
-        return self.svg.render()
+        return self.svg.render(is_unicode=is_unicode)
 
     def render_tree(self):
         self._render()
@@ -180,8 +200,8 @@ class BaseGraph(object):
         return Response(self.render(), mimetype='image/svg+xml')
 
     def render_to_file(self, filename):
-        with open(filename, 'w') as f:
-            f.write(self.render())
+        with io.open(filename, 'w', encoding='utf-8') as f:
+            f.write(self.render(is_unicode=True))
 
     def render_to_png(self, filename):
         import cairosvg
diff --git a/pygal/graph/graph.py b/pygal/graph/graph.py
index 66e157c..b9ffe2b 100644
--- a/pygal/graph/graph.py
+++ b/pygal/graph/graph.py
@@ -1,3 +1,22 @@
+# -*- coding: utf-8 -*-
+# This file is part of pygal
+#
+# A python svg graph plotting library
+# Copyright © 2012 Kozea
+#
+# This library is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# 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 __future__ import division
 from pygal.graph.base import BaseGraph
 from pygal.view import View, LogView
 from pygal.util import is_major
diff --git a/pygal/graph/line.py b/pygal/graph/line.py
index 5604cd8..cb3289b 100644
--- a/pygal/graph/line.py
+++ b/pygal/graph/line.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.graph import Graph
 from pygal.util import cached_property
 from pygal.interpolate import interpolation
@@ -55,9 +56,9 @@ class Line(Graph):
                     continue
 
                 classes = []
-                if x > self.view.width / 2.:
+                if x > self.view.width / 2:
                     classes.append('left')
-                if y > self.view.height / 2.:
+                if y > self.view.height / 2:
                     classes.append('top')
                 classes = ' '.join(classes)
 
diff --git a/pygal/graph/pie.py b/pygal/graph/pie.py
index c41ceda..7ef5453 100644
--- a/pygal/graph/pie.py
+++ b/pygal/graph/pie.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.graph import Graph
 from math import cos, sin, pi
 project = lambda rho, alpha: (
@@ -30,7 +31,7 @@ class Pie(Graph):
 
     def slice(self, serie_node, start_angle, angle, perc,
             small=False):
-        val = '{:.2%}'.format(perc)
+        val = '{0:.2%}'.format(perc)
         slices = self.svg.node(serie_node['plot'], class_="slices")
         slice_ = self.svg.node(slices, class_="slice")
         center = ((self.width - self.margin.x) / 2.,
@@ -64,7 +65,7 @@ class Pie(Graph):
         self.svg.node(slice_, 'desc', class_="value").text = val
         tooltip_position = map(
             str, diff(center, project(
-                (r + small_r) / 2., start_angle + angle / 2.)))
+                (r + small_r) / 2, start_angle + angle / 2)))
         self.svg.node(slice_, 'desc',
                       class_="x centered").text = tooltip_position[0]
         self.svg.node(slice_, 'desc',
diff --git a/pygal/graph/radar.py b/pygal/graph/radar.py
index 39d0743..7242f6e 100644
--- a/pygal/graph/radar.py
+++ b/pygal/graph/radar.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.line import Line
 from pygal.view import PolarView
 from pygal.util import deg, cached_property
@@ -67,7 +68,7 @@ class Radar(Line):
                       y=pos_text[1]
             )
             text.text = label
-            angle = - theta + pi / 2.
+            angle = - theta + pi / 2
             if cos(angle) < 0:
                 angle -= pi
             text.attrib['transform'] = 'rotate(%f %s)' % (
@@ -92,7 +93,7 @@ class Radar(Line):
             ).text = label
 
     def _compute(self):
-        delta = 2 * pi / float(self._len)
+        delta = 2 * pi / self._len
         self._x_pos = [.5 * pi + i * delta for i in range(self._len + 1)]
         for serie in self.series:
             vals = list(serie.values)
@@ -112,7 +113,7 @@ class Radar(Line):
                 interpolate = interpolation(
                     extended_x_pos, extended_vals, kind=self.interpolate)
                 serie.interpolated = []
-                p = float(self.interpolation_precision)
+                p = self.interpolation_precision
                 for s in range(int(p + 1)):
                     x = .5 * pi + 2 * pi * (s / p)
                     serie.interpolated.append((float(interpolate(x)), x))
diff --git a/pygal/graph/stackedbar.py b/pygal/graph/stackedbar.py
index e8ee9b6..b43e441 100644
--- a/pygal/graph/stackedbar.py
+++ b/pygal/graph/stackedbar.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.bar import Bar
 
 
@@ -35,7 +36,7 @@ class StackedBar(Bar):
             min(min(negative_vals), 0), max(max(positive_vals), 0))
         self._length = len(self.series[0].values)
 
-        x_pos = [x / float(self._length)
+        x_pos = [x / self._length
                  for x in range(self._length + 1)
              ] if self._length > 1 else [0, 1]  # Center if only one value
         y_pos = self._compute_scale(self._box.ymin, self._box.ymax
diff --git a/pygal/graph/xy.py b/pygal/graph/xy.py
index eb496a0..7c5ed3c 100644
--- a/pygal/graph/xy.py
+++ b/pygal/graph/xy.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal.graph.line import Line
 from pygal.interpolate import interpolation
 from math import isnan
@@ -48,7 +49,7 @@ class XY(Line):
                 serie_xmax = max(vals[0])
                 serie.interpolated = []
                 r = (max(xvals) - xmin)
-                p = float(self.interpolation_precision)
+                p = self.interpolation_precision
                 for s in range(int(p + 1)):
                     x = xmin + r * (s / p)
                     if (serie_xmin <= x <= serie_xmax and not
diff --git a/pygal/svg.py b/pygal/svg.py
index 550c1c2..8a49f93 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -16,6 +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/>.
+from __future__ import division
+import io
 import os
 from lxml import etree
 from pygal.util import template
@@ -44,23 +46,23 @@ class Svg(object):
 
     def add_style(self, css):
         style = self.node(self.defs, 'style', type='text/css')
-        with open(css) as f:
+        with io.open(css, encoding='utf-8') as f:
             templ = template(
                 f.read(),
                 style=self.graph.style,
                 font_sizes=self.graph.font_sizes(),
                 hidden='y' if self.graph._horizontal else 'x')
-            style.text = templ.decode('utf-8')
+            style.text = templ
 
     def add_script(self, js):
         script = self.node(self.defs, 'script', type='text/javascript')
-        with open(js) as f:
+        with io.open(js, encoding='utf-8') as f:
             templ = template(
                 f.read(),
                 font_sizes=self.graph.font_sizes(False),
                 animation_steps=self.graph.animation_steps
             )
-            script.text = templ.decode('utf-8')
+            script.text = templ
 
     def node(self, parent=None, tag='g', attrib=None, **extras):
         if parent is None:
@@ -119,11 +121,11 @@ class Svg(object):
             class_='no_data')
             no_data.text = self.graph.no_data_text
 
-    def render(self):
+    def render(self, is_unicode=False):
         svg = etree.tostring(
             self.root, pretty_print=True,
             xml_declaration=not self.graph.disable_xml_declaration,
             encoding='utf-8')
-        if self.graph.disable_xml_declaration:
+        if self.graph.disable_xml_declaration or is_unicode:
             svg = svg.decode('utf-8')
         return svg
diff --git a/pygal/test/test_config.py b/pygal/test/test_config.py
index 656a420..daa55c7 100644
--- a/pygal/test/test_config.py
+++ b/pygal/test/test_config.py
@@ -34,6 +34,10 @@ def test_logarithmic():
 
 
 def test_logarithmic_bad_interpolation():
+    try:
+        import scipy
+    except ImportError:
+        return
     line = Line(logarithmic=True, interpolate='cubic')
     line.add('_', [.001, .00000001, 1])
     q = line.render_pyquery()
diff --git a/pygal/test/test_graph.py b/pygal/test/test_graph.py
index c2be88e..98c2a44 100644
--- a/pygal/test/test_graph.py
+++ b/pygal/test/test_graph.py
@@ -48,6 +48,11 @@ def test_render_to_file():
 
 
 def test_render_to_png():
+    try:
+        import cairosvg
+    except ImportError:
+        return
+
     file_name = '/tmp/test_graph.png'
     if os.path.exists(file_name):
         os.remove(file_name)
diff --git a/pygal/test/test_line.py b/pygal/test/test_line.py
index a8986e7..5dd28a4 100644
--- a/pygal/test/test_line.py
+++ b/pygal/test/test_line.py
@@ -16,6 +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/>.
+from __future__ import division
 from pygal import Line
 from pygal.test.utils import texts
 from math import cos, sin
@@ -24,9 +25,9 @@ from math import cos, sin
 def test_simple_line():
     line = Line()
     rng = range(-30, 31, 5)
-    line.add('test1', [cos(x / 10.) for x in rng])
-    line.add('test2', [sin(x / 10.) for x in rng])
-    line.add('test3', [cos(x / 10.) - sin(x / 10.) for x in rng])
+    line.add('test1', [cos(x / 10) for x in rng])
+    line.add('test2', [sin(x / 10) for x in rng])
+    line.add('test3', [cos(x / 10) - sin(x / 10) for x in rng])
     line.x_labels = map(str, rng)
     line.title = "cos sin and cos - sin"
     q = line.render_pyquery()
diff --git a/pygal/util.py b/pygal/util.py
index 1d4214f..1a9ad3f 100644
--- a/pygal/util.py
+++ b/pygal/util.py
@@ -16,6 +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/>.
+from __future__ import division
 from decimal import Decimal
 from math import floor, pi, log, log10
 ORDERS = u"yzafpnµm kMGTPEZY"
@@ -29,9 +30,9 @@ def humanize(number):
     order = number and int(floor(log(abs(number)) / log(1000)))
     human_readable = ORDERS.split(" ")[int(order > 0)]
     if order == 0 or order > len(human_readable):
-        return float_format(number / float(1000 ** int(order)))
+        return float_format(number / (1000 ** int(order)))
     return (
-        float_format(number / float(1000 ** int(order))) +
+        float_format(number / (1000 ** int(order))) +
         human_readable[int(order) - int(order > 0)])
 
 
@@ -42,13 +43,13 @@ def is_major(number):
 
 def round_to_int(number, precision):
     precision = int(precision)
-    rounded = (int(number) + precision / 2) / precision * precision
+    rounded = (int(number) + precision / 2) // precision * precision
     return rounded
 
 
 def round_to_float(number, precision):
-    rounded = Decimal(
-        floor((number + precision / 2) / precision)) * Decimal(str(precision))
+    rounded = Decimal(str(floor((number + precision / 2) // precision))
+    ) * Decimal(str(precision))
     return float(rounded)
 
 
@@ -67,7 +68,7 @@ def cut(list_, index=0):
 
 
 def rad(deg):
-    return pi * deg / 180.
+    return pi * deg / 180
 
 
 def deg(deg):
diff --git a/pygal/view.py b/pygal/view.py
index 25238fd..dd1c159 100644
--- a/pygal/view.py
+++ b/pygal/view.py
@@ -16,6 +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/>.
+from __future__ import division
 from math import sin, cos, log10
 
 
@@ -79,13 +80,13 @@ class View(object):
     def x(self, x):
         if x == None:
             return None
-        return self.width * (x - self.box.xmin) / float(self.box.width)
+        return self.width * (x - self.box.xmin) / self.box.width
 
     def y(self, y):
         if y == None:
             return None
         return (self.height - self.height *
-                (y - self.box.ymin) / float(self.box.height))
+                (y - self.box.ymin) / self.box.height)
 
     def __call__(self, xy):
         x, y = xy
@@ -118,4 +119,4 @@ class LogView(View):
             return None
         return (self.height - self.height *
                 (log10(y) - self.log10_ymin)
-                / float(self.log10_ymax - self.log10_ymin))
+                / (self.log10_ymax - self.log10_ymin))
diff --git a/setup.py b/setup.py
index 3406a71..bbed9a7 100644
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@ setup(
     tests_require=["pytest", "pyquery", "flask", "cairosvg"],
     package_data={'pygal': ['css/*', 'js/*']},
     install_requires=['lxml'],
+    use_2to3=True,
     classifiers=[
         "Development Status :: 4 - Beta",
         "Environment :: Console",
@@ -50,4 +51,5 @@ setup(
         "GNU Library or Lesser General Public License (LGPL)",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 3",
         "Topic :: Multimedia :: Graphics :: Presentation"])
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..09caee1
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,8 @@
+[tox]
+envlist = py26,py27,py32
+[testenv]
+changedir=demo
+commands=py.test --pyargs pygal []
+deps =
+     pytest
+     pyquery