old_contents: from django.conf.urls import patterns, url
  
  urlpatterns = patterns('robots.views',
      url(r'^$', 'rules_list', name='robots_rule_list'),
  )
  
new_contents: from django.conf.urls.defaults import *
  
  urlpatterns = patterns(
      'robots.views',
      url(r'^$', 'rules_list', name='robots_rule_list'),
  )
  
subject: update url import statement for compatibility