代碼如下：1#coding:utf823fromdjango.conf.urls.defaultsimportpatterns,url45fromviews.informationimportinformation6fromviews.long_relatedimportlong_related7fromviews.relatedimportrelated89urlpatterns=[]10urlpatterns+=patterns(11'',#這個空字符串的作用是什么？12url(r'^video/app/article/information/$',information,{'version':17}),13url(r'^video/app/article/information/v(?P\d+)/$',information),14url(r'^test/information/v(?P\d+)/$',information),15)1617urlpatterns+=patterns(#為什么要另外定義一個patterns加到urlpatterns中？18'',19url(r'^video/app/article/related/$',related,{'version':1}),20url(r'^video/app/article/related/v(?P\d+)/$',related),21)2223urlpatterns+=patterns(24'',25url(r'^video/app/article/related/long/$',long_related,{'version':1}),26)問題也如代碼中的注釋，首先為什么要append三個patterns，合在一起不行嗎？比如9urlpatterns=[]10urlpatterns+=patterns(11'',#這個空字符串的作用是什么？12url(r'^video/app/article/information/$',information,{'version':17}),13url(r'^video/app/article/information/v(?P\d+)/$',information),14url(r'^test/information/v(?P\d+)/$',information),19url(r'^video/app/article/related/$',related,{'version':1}),20url(r'^video/app/article/related/v(?P\d+)/$',related),25url(r'^video/app/article/related/long/$',long_related,{'version':1}),26)另外，patterns里面有一個空字符串‘’，這是干什么的呢？