admin2.py

from django.contrib.admin import AdminSite
from .login import CustomLoginForm
from django.utils.translation import ugettext_lazy as _
from .models import MyModel

Class CustomLoginAdminSite(AdminSite):
    site_title = _('My site admin')
    site_header = _('Administration')
    index_title = _('CustomLogin')
    #registering Custom login form for the Login interface
    #this login form uses CustomBackend
    login_form = CustomLoginForm

#create a Admin_site object to register models
admin_site = CustomLoginAdminSite()

#register Models as usual
admin_site.register(MyModel)

line 6 Class CustomLoginAdminSite(AdminSite):
lowercase class