如下是django框架中urls.py的代码，urlpatterns为什么要分开写，那个空字符串又是做什么的呢？

Question

代码如下：1#coding:utf823fromdjango.conf.urls.defaultsimportpatterns,url45fromviews.informationimportinformation6fromviews.long_relatedimportlong_related7fromviews.relatedimportrelated89urlpatterns=[]10urlpatterns+=patterns(11'',#这个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+)/$',information),15)1617urlpatterns+=patterns(#为什么要另外定义一个patterns加到urlpatterns中？18'',19url(r'^video/app/article/related/$',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)问题也如代码中的注释，首先为什么要append三个patterns，合在一起不行吗？比如9urlpatterns=[]10urlpatterns+=patterns(11'',#这个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里面有一个空字符串‘’，这是干什么的呢？

Answer 1

1、为什么要append三个pattern
为了可读性和可维护性，通常会把相同功能或相似url的放到一组里面
这是不同人的不同写法，当然可以所有的都写到一起
2、patterns里面有一个空字符串‘’，这是干什么的呢
patterns(prefix,*args)方法的第一个参数