matplotlib/matplotlib — pull request #3358 by jenshnielsen (2014-08-10 10:26:35+00:00)
Title: Don't use unicode_literals in backend_qt4

This is an alternative to #3357. In short using unicode_lieterals with
six.u does not work and results in TypeErrors in python 2. This fixes
is by not using unicode_literals rather than getting rid of six.u

An alternative to #3357
This seems to work too but I am less confident that it will not introduce other issues.