django 后台 name 'admin' is not defined

name 'admin' is not defined

In tutorial page 2, after you setup admin site, I get "name 'admin' is not defined" then a stacktrace.
add line from django.contrib import admin to the urls.py. so the file looks like below:

from django.conf.urls.defaults import *
from django.contrib import admin 

# Uncomment the next two lines to enable the admin:
# from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    # Example:
    # (r'^django01/', include('django01.foo.urls')),

    # Uncomment the admin/doc line below and add 'django.contrib.admindocs' 
    # to INSTALLED_APPS to enable admin documentation:
    (r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
    (r'^admin/', include(admin.site.urls)),

)
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