six: py3compat.py: handlers for iteritems, iterkeys, itervalues
@@ -19,6 +19,10 @@ from six import integer_types
from six import string_types
from six import text_type
+from six import iteritems
+from six import iterkeys
+from six import itervalues
+
# from six import BytesIO # see below!
from six import StringIO
