Django open inviter is a python port of the PHP api client for‘s contact importer to work with Django. I build it for our fashion community,, where it is currently in production usage and fully functional. If you are a member of Fashiolista (which I highly doubt given the different audiences) you can test it by clicking find friends in your profile.
Usage is extremly straight forward:

from django_open_inviter.open_inviter import OpenInviter
o = OpenInviter()
contacts = o.contacts('[email protected]', 'test')

Get the code here.