add import six as it is part of the standard imports

wernerfb · wernerfb · commit 91c4296ee69f · 2015-04-24T08:45:38.000+02:00
diff --git a/lib/matplotlib/backends/backend_wxagg.py b/lib/matplotlib/backends/backend_wxagg.py
@@ -1,6 +1,8 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
+import six
+
 import matplotlib
 from matplotlib.figure import Figure
 
diff --git a/lib/matplotlib/backends/wx_compat.py b/lib/matplotlib/backends/wx_compat.py
@@ -10,6 +10,7 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
+import six
 from distutils.version import LooseVersion
 
 missingwx = "Matplotlib backend_wx and backend_wxagg require wxPython >=2.8.12"
