问题是您的网址格式缺少^和$.

The problem is your url patterns are missing ^ and $.

没有它们，"admin"模式将匹配其中带有"admin"的任何url，从而有效地掩盖了以下模式.

Without them, the 'admin' pattern is matching any url with 'admin' in it -- effectively masking the following patterns.

尝试使用此代替:

urlpatterns = patterns('',
    url(r'^$', views.index, name='index'),
    url(r'^admin/$', views.admin, name='admin'),
    url(r'^admin/edit/(?P<pk>\d+)/$', views.bug_edit, name='bug_edit'),
    url(r'^admin/delete/(?P<pk>\d+)/$', views.bug_delete, name='bug_delete'),
)