File "/home/virtualenv/python3.3.5/lib/python3.3/site-packages/django/dispatch/__init__.py", line 9, in <module>
from django.dispatch.dispatcher import Signal, receiver # NOQA
File "/home/virtualenv/python3.3.5/lib/python3.3/site-packages/django/dispatch/dispatcher.py", line 14, in <module>
from weakref import WeakMethod
ImportError: cannot import name WeakMethod