MNT : six-ified BytesIO import in pdf backend

tacaswell · tobias47n9e · commit c35ee74039be · 2014-06-25T18:12:49.000+02:00
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -20,11 +20,8 @@
 
 import numpy as np
 from six import unichr
+from six import BytesIO
 
-if six.PY3:
-    from io import BytesIO
-else:
-    from cStringIO import StringIO as BytesIO
 from datetime import datetime
 from math import ceil, cos, floor, pi, sin
 try:
