from django.contrib.auth.models import User

from django.db import models

class Concrete(models.Model):

    pass

class Proxy(Concrete):

    class Meta:

        proxy = True

        permissions = (("display_proxys", "May display proxys information"),)

class UserProxy(User):

    class Meta:

        proxy = True

        permissions = (("use_different_app_label", "May use a different app label"),)