post migrate signal that create new permissions

__init__.py

#coding:utf-8
from south.signals import post_migrate

def update_permission_after_migration(app, **kwargs):
    """
    your_project.__init__.py is a nice place to stay
    Update app permission just after every migration.
    This is based on app djando_extensions update_permissions management command.
    """

    from django.conf import settings
    from django.db.models import get_app, get_models
    from django.contrib.auth.management import create_permissions

    create_permissions(get_app(app), get_models(), 2 if settings.DEBUG else 0)

post_migrate.connect(update_permission_after_migration)