Django：为所有用户扩展Admin

Question

我正在Djano中创建一个多用户博客，并希望为所有用户使用Admin视图来提供创建，编辑和删除帖子的功能。

我找到了this教程，该教程解释了管理员对非员工用户的使用。但是，我收到了错误

cannot import name user_admin_site

admin.py

from django.contrib import admin
from django.contrib.admin.sites import AdminSite

class UserAdmin(AdminSite):
    pass

user_admin_site = UserAdmin(name='user')

urls.py

from django.conf.urls import patterns, include, url
from django.contrib import admin
from myapp.admin import user_admin_site

admin.autodiscover()

urlpatterns = patterns('',
     url(r'^admin/', include(admin.site.urls)),
     url(r'^', include(user_admin_site.urls)),
     url(r'^', include('myapp.urls')),
)