Django找不到admin.sites.url

我正在使用rc1.3在本地开发一个django站点,在对我的urls.py文件进行了几次调整之后,我收到了django无法导入admin.site.urls的错误消息。由urls.py文件在下面。
urlpatterns = patterns('',
# Example:

(r'^city/$', 'venue.views.city_index'),
(r'^accounts/', include('registration.urls')),
(r'^accountss/', include('registration.backends.simple.urls')),
(r'^profiles/', include('profiles.urls')),
(r'^admin/', include('admin.site.urls')),

(r'^city/(?P<city>[-w]+)/$', 'venue.views.city_detail'),
(r'^city/(?P<city>[-w]+)/venue/$', 'venue.views.venue_index'),
)
不知道是什么原因造成的,谢谢。     
已邀请:
http://docs.djangoproject.com/en/dev/intro/tutorial02/#activate-the-admin-site 不包括字符串路径,实际导入管理模块并指向其URL。
from django.contrib import admin

urlpatterns += patterns('',
    (r'^admin/', include(admin.site.urls)),
)
    

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