if I use pip3 install -U matplotlib, I just get broken matplotlib with mpl_toolkits.

For instance, view /usr/lib/python3/dist-packages/mpl_toolkits/mplot3d/__init__.py, and I got:

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

from matplotlib.externals import six

from .axes3d import Axes3D

And this seems to be like the second last commit from now.

https://github.com/matplotlib/matplotlib/blob/8fe495a705153bdb7a224f58c02d54272c321094/lib/mpl_toolkits/mplot3d/__init__.py

Environment:

• Ubuntu 16.04
• Python 3.5
• Matplotlib (2.0.0-1)