[py3k] Import name2codepoint from six.moves

Related to #268148.

__init__.py

@@ -35,10 +35,11 @@ import locale
 import mimetypes
 import re
 import string
-import htmlentitydefs
 import codecs
 from io import BytesIO
 
+from six.moves.html_entities import name2codepoint
+
 try:
     import chardet
 except ImportError:
@@ -144,7 +145,7 @@ def xml_escape(data):
 
 def html_unescape(data):
     """unescapes XML/HTML entities"""
-    for entityname, codepoint in htmlentitydefs.name2codepoint.iteritems():
+    for entityname, codepoint in name2codepoint.items():
         data = data.replace('&%s;' % entityname, unichr(codepoint))
     return data.replace(''', "'")