old_contents: from django.conf.urls import patterns, include, url
  from facemash.views import ratings_calculator, play, ratings_page
  
  urlpatterns = patterns('',
  	url(r'^$', play, name="play"),
      url(r'^calcultor/(?P<winner_id>\d+)-(?P<loser_id>\d+)/$', ratings_calculator, name="calculator"),
      url(r'^ratings/$', ratings_page, name="ratings"),
  )
  
new_contents: from django.conf.urls import patterns, include, url
  from facemash.views import ratings_calculator, play, ratings_page
  
  urlpatterns = patterns('',
      url(r'^$', play, name="play"),
      url(r'^calcultor/(?P<winner_id>\d+)-(?P<loser_id>\d+)/$', ratings_calculator, name="calculator"),
      url(r'^ratings/$', ratings_page, name="ratings"),
  )
  
subject: Update urls.py