A final refactor using url includes

lists/urls.py

+from django.conf.urls import patterns, url
+from django.contrib import admin
+
+urlpatterns = patterns('',
+    # Examples:
+    url(r'^(\d+)/$', 'lists.views.view_list', name='view_list'),
+    url(r'^(\d+)/add_item$', 'lists.views.add_item', name='add_item'),
+    url(r'^new$', 'lists.views.new_list', name='new_list'),
+    
+)

superlists/urls.py

@@ -4,9 +4,7 @@ from django.contrib import admin
 urlpatterns = patterns('',
     # Examples:
     url(r'^$', 'lists.views.home_page', name='home'),
-    url(r'^lists/(\d+)/$', 'lists.views.view_list', name='view_list'),
-    url(r'^lists/(\d+)/add_item$', 'lists.views.add_item', name='add_item'),
-    url(r'^lists/new$', 'lists.views.new_list', name='new_list'),
+    url(r'^lists/', include('lists.urls')),
     # url(r'^blog/', include('blog.urls')),
 
     # url(r'^admin/', include(admin.site.urls)),