Fix raise TypeError 'TypeError: multiple bases have instance lay-out conflict' if try to use inheriting from both collections.defaultdict and collections.OrderedDict but not in Python 2.7.x or 3.4.x
Fix raise TypeError 'TypeError: multiple bases have instance lay-out conflict'
if try to use inheriting from both collections.defaultdict and
collections.OrderedDict but not in Python 2.7.x or 3.4.x

pycontw/pycontw2016,pycontw/pycontw2016,pycontw/pycontw2016,pycontw/pycontw2016