old_contents: from django.conf.urls import patterns
  from django.conf.urls import url
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  
  from openstack_catalog import views
  
  urlpatterns = patterns('', url(r'^$', views.index))
  
  urlpatterns += staticfiles_urlpatterns()
  
new_contents: from django.conf.urls import url
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  
  from openstack_catalog import views
  
  urlpatterns = [url(r'^$', views.index)]
  
  urlpatterns += staticfiles_urlpatterns()
  
subject: Fix django warning