DOC: add note about encoding choice

tacaswell · tacaswell · commit ab4a69136d4e · 2017-10-21T16:16:58.000-04:00
diff --git a/lib/matplotlib/dviread.py b/lib/matplotlib/dviread.py
@@ -1031,6 +1031,8 @@ def find_tex_file(filename, format=None):
     """
 
     if six.PY3:
+        # we expect these to always be ascii encoded, but use utf-8
+        # out of caution
         if isinstance(filename, bytes):
             filename = filename.decode('utf-8', errors='replace')
         if isinstance(format, bytes):
