old_contents: from django.conf.urls import include, url
  from django.contrib import admin
  
  urlpatterns = [
      url(r'^polls/', include('polls.urls', namespace = "polls")),
      url(r'^admin/', include(admin.site.urls)),
  ]
  
new_contents: from django.conf.urls import include, url
  from django.contrib import admin
  
  urlpatterns = [
      url(r'^polls/', include('polls.urls', namespace = 'polls')),
      url(r'^', include('polls.urls', namespace = 'polls')),
      url(r'^admin/', include(admin.site.urls)),
  ]
  
subject: Fix root url