Django2.1 include()函数报错'provide the namespace argument to include() instead.' % len(arg)
《Python编程:从入门到实践》项目三Web应用程序书中原来的程序fromdjango.conf.urlsimportinclude,urlfromdjango.contribimportadminurlpatterns=[url(r'^admin/',include(admin.site.urls)),url(r'',include('learning_logs.urls',namespace