import StringIO
import sys
+import six
from six.moves import range
__pychecker__ = 'no-stringiter'
if self.sort_keys:
items = sorted(obj.items())
else:
- items = obj.iteritems()
+ items = six.iteritems(obj)
for i, (key, value) in enumerate(items):
if i > 0:
self.stream.write(u",")