Mine

>>> u = UserExt.objects.get(username="zinor")
>>> u
<UserExt: Zinor>
>>> g = Group.objects.get(name="Users")
>>> g
<Group: Users>
>>> u.groups.add(g)
<django.db.models.fields.related.ManyRelatedManager object at 0x1d69210>
>>> u.save()
>>> u.groups.all()
[<Group: Users>]
>>> u.get_all_permissions()
Set([])
>>> u.get_group_permissions()
Set([])
>>> g.permissions.all()
[<Permission: WikiPage | Can delete WikiPage>, <Permission: WikiPage | Can edit                                                                                             page>, <Permission: WikiPage | Can move page>]
>>>