diff --git a/build/lib/svgpathtools/bezier.py b/build/lib/svgpathtools/bezier.py
index 1919e68..db4c869 100644
--- a/build/lib/svgpathtools/bezier.py
+++ b/build/lib/svgpathtools/bezier.py
@@ -5,6 +5,8 @@ points given by their standard representation."""
 
 # External dependencies:
 from __future__ import division, absolute_import, print_function
+from builtins import range
+from builtins import object
 from math import factorial as fac, ceil, log, sqrt
 from numpy import poly1d
 
@@ -83,12 +85,13 @@ def bezier2polynomial(p, numpy_ordering=True, return_poly1d=False):
         coeffs = p
     else:
         # https://en.wikipedia.org/wiki/Bezier_curve#Polynomial_form
-        n = len(p) + 1
+        n = len(p) - 1
         coeffs = [fac(n)//fac(n-j) * sum(
-            (-1)**(i+j) * p[i] / (fac(i) * fac(j-i)) for i in xrange(j+1))
+            (-1)**(i+j) * p[i] / (fac(i) * fac(j-i)) for i in range(j+1))
             for j in range(n+1)]
-    if not numpy_ordering:
         coeffs.reverse()
+    if not numpy_ordering:
+        coeffs = coeffs[::-1]  # can't use .reverse() as might be tuple
     if return_poly1d:
         return poly1d(coeffs)
     return coeffs
diff --git a/build/lib/svgpathtools/directional_field.py b/build/lib/svgpathtools/directional_field.py
new file mode 100644
index 0000000..b77351d
--- /dev/null
+++ b/build/lib/svgpathtools/directional_field.py
@@ -0,0 +1,21 @@
+def directional_field(curve, tvals=np.linspace(0, 1, N), asize=1e-2, 
+                      colored=False):
+
+    size = asize * curve.length()
+    arrows = []
+    tvals = np.linspace(0, 1, N)
+    for t in tvals:
+        pt = curve.point(t)
+        ut = curve.unit_tangent(t)
+        un = curve.normal(t)
+        l1 = Line(pt, pt + size*(un - ut)/2).reversed()
+        l2 = Line(pt, pt + size*(-un - ut)/2)
+        if colored:
+            arrows.append(Path(l1, l2))
+        else:
+            arrows += [l1, l2]
+    if colored:
+        colors = [(int(255*t), 0, 0) for t in tvals]
+        return arrows, tvals, colors
+    else:
+        return Path(arrows)
\ No newline at end of file
diff --git a/build/lib/svgpathtools/misctools.py b/build/lib/svgpathtools/misctools.py
index 787d000..5deb0bc 100644
--- a/build/lib/svgpathtools/misctools.py
+++ b/build/lib/svgpathtools/misctools.py
@@ -3,6 +3,7 @@ aren't specific to SVGs or related mathematical objects."""
 
 # External dependencies:
 from __future__ import division, absolute_import, print_function
+from builtins import range
 import os
 import sys
 import webbrowser
diff --git a/build/lib/svgpathtools/path.py b/build/lib/svgpathtools/path.py
index 1484b5a..f14ce0a 100644
--- a/build/lib/svgpathtools/path.py
+++ b/build/lib/svgpathtools/path.py
@@ -4,6 +4,10 @@ Arc."""
 
 # External dependencies
 from __future__ import division, absolute_import, print_function
+from builtins import map
+from builtins import zip
+from builtins import range
+from builtins import object
 from math import sqrt, cos, sin, acos, degrees, radians, log, pi
 from cmath import exp, sqrt as csqrt, phase
 from collections import MutableSequence
@@ -355,7 +359,8 @@ def inv_arclength(curve, s, s_tol=ILENGTH_S_TOL, maxits=ILENGTH_MAXITS,
         if curve is a Path object, then seg is a segment in curve.
     error - used to compute lengths of cubics and arcs
     min_depth - used to compute lengths of cubics and arcs
-    Note:  This function is not designed to be efficient."""
+    Note:  This function is not designed to be efficient, but if it's slower
+    than you need, make sure you have scipy installed."""
 
     curve_length = curve.length(error=error, min_depth=min_depth)
     assert curve_length > 0
@@ -1514,7 +1519,7 @@ class Arc(object):
             u1poly_mag2 = real(u1poly)**2 + imag(u1poly)**2
             t2s = polyroots01(u1poly_mag2 - 1)
             t1s = [self.phase2t(phase(u1poly(t2))) for t2 in t2s]
-            return zip(t1s, t2s)
+            return list(zip(t1s, t2s))
         elif isinstance(other_seg, Arc):
             assert other_seg != self
             # This could be made explicit to increase efficiency
@@ -2126,7 +2131,7 @@ class Path(MutableSequence):
         """returns a bounding box for the input Path object in the form
         (xmin, xmax, ymin, ymax)."""
         bbs = [seg.bbox() for seg in self._segments]
-        xmins, xmaxs, ymins, ymaxs = zip(*bbs)
+        xmins, xmaxs, ymins, ymaxs = list(zip(*bbs))
         xmin = min(xmins)
         xmax = max(xmaxs)
         ymin = min(ymins)
diff --git a/build/lib/svgpathtools/paths2svg.py b/build/lib/svgpathtools/paths2svg.py
index d09ff57..48a4ff9 100644
--- a/build/lib/svgpathtools/paths2svg.py
+++ b/build/lib/svgpathtools/paths2svg.py
@@ -3,6 +3,8 @@ segments."""
 
 # External dependencies:
 from __future__ import division, absolute_import, print_function
+from builtins import zip
+from builtins import str
 from math import ceil
 from os import getcwd, path as os_path, makedirs
 from xml.dom.minidom import parse as md_xml_parse
@@ -74,7 +76,7 @@ def big_bounding_box(paths_n_stuff):
                 raise TypeError(
                     "paths_n_stuff can only contains Path, CubicBezier, "
                     "QuadraticBezier, Line, and complex objects.")
-    xmins, xmaxs, ymins, ymaxs = zip(*bbs)
+    xmins, xmaxs, ymins, ymaxs = list(zip(*bbs))
     xmin = min(xmins)
     xmax = max(xmaxs)
     ymin = min(ymins)
diff --git a/build/lib/svgpathtools/smoothing.py b/build/lib/svgpathtools/smoothing.py
index 424ed99..33f763e 100644
--- a/build/lib/svgpathtools/smoothing.py
+++ b/build/lib/svgpathtools/smoothing.py
@@ -5,6 +5,7 @@ curves."""
 from __future__ import division, absolute_import, print_function
 
 # Internal Dependencies
+from builtins import range
 from .path import Path, CubicBezier, Line
 from .misctools import isclose
 from .paths2svg import disvg
@@ -23,7 +24,7 @@ def is_differentiable(path, tol=1e-8):
 def kinks(path, tol=1e-8):
     """returns indices of segments that start on a non-differentiable joint."""
     kink_list = []
-    for idx in xrange(len(path)):
+    for idx in range(len(path)):
         if idx == 0 and not path.isclosed():
             continue
         try:
diff --git a/build/lib/svgpathtools/svg2paths.py b/build/lib/svgpathtools/svg2paths.py
index c3b66f9..1d3274c 100644
--- a/build/lib/svgpathtools/svg2paths.py
+++ b/build/lib/svgpathtools/svg2paths.py
@@ -3,6 +3,7 @@ The main tool being the svg2paths() function."""
 
 # External dependencies
 from __future__ import division, absolute_import, print_function
+from builtins import zip
 from xml.dom.minidom import parse
 from os import path as os_path, getcwd
 from shutil import copyfile
@@ -64,9 +65,9 @@ def svg2paths(svg_file_location,
 
     def dom2dict(element):
         """Converts DOM elements to dictionaries of attributes."""
-        keys = element.attributes.keys()
-        values = [val.value for val in element.attributes.values()]
-        return dict(zip(keys, values))
+        keys = list(element.attributes.keys())
+        values = [val.value for val in list(element.attributes.values())]
+        return dict(list(zip(keys, values)))
 
     # Use minidom to extract path strings from input SVG
     paths = [dom2dict(el) for el in doc.getElementsByTagName('path')]
diff --git a/dist/svgpathtools-1.3-py2.py3-none-any.whl b/dist/svgpathtools-1.3-py2.py3-none-any.whl
new file mode 100644
index 0000000..8dcaa86
Binary files /dev/null and b/dist/svgpathtools-1.3-py2.py3-none-any.whl differ
diff --git a/dist/svgpathtools-1.3.tar.gz b/dist/svgpathtools-1.3.tar.gz
new file mode 100644
index 0000000..9bc1a2a
Binary files /dev/null and b/dist/svgpathtools-1.3.tar.gz differ
diff --git a/svgpathtools.egg-info/PKG-INFO b/svgpathtools.egg-info/PKG-INFO
index 2047ffe..bbef88f 100644
--- a/svgpathtools.egg-info/PKG-INFO
+++ b/svgpathtools.egg-info/PKG-INFO
@@ -1,12 +1,12 @@
 Metadata-Version: 1.1
 Name: svgpathtools
-Version: 1.2.6
+Version: 1.3
 Summary: A collection of tools for manipulating and analyzing SVG Path objects and Bezier curves.
 Home-page: https://github.com/mathandy/svgpathtools
 Author: Andy Port
 Author-email: AndyAPort@gmail.com
 License: MIT
-Download-URL: http://github.com/mathandy/svgpathtools/tarball/1.2.6
+Download-URL: http://github.com/mathandy/svgpathtools/tarball/1.3
 Description: svgpathtools
         ============
         
diff --git a/svgpathtools.egg-info/SOURCES.txt b/svgpathtools.egg-info/SOURCES.txt
index bd2f2f6..99a5197 100644
--- a/svgpathtools.egg-info/SOURCES.txt
+++ b/svgpathtools.egg-info/SOURCES.txt
@@ -15,6 +15,7 @@ test.svg
 vectorframes.svg
 svgpathtools/__init__.py
 svgpathtools/bezier.py
+svgpathtools/directional_field.py
 svgpathtools/misctools.py
 svgpathtools/parser.py
 svgpathtools/path.py