old_contents: from django.conf.urls import patterns, url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.KeyListView.as_view(), name="list"),
      url(r'^(?P<pk>\d+)/$', views.KeyDetailView.as_view(), name="details"),
      url(r'^(?P<pk>\d+)/usun/$', views.KeyDeleteView.as_view(), name="delete"),
      url(r'^stworz/$', views.KeyCreateView.as_view(), name="create"),
  ]
  
new_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.KeyListView.as_view(), name="list"),
      url(r'^(?P<pk>\d+)/$', views.KeyDetailView.as_view(), name="details"),
      url(r'^(?P<pk>\d+)/usun/$', views.KeyDeleteView.as_view(), name="delete"),
      url(r'^stworz/$', views.KeyCreateView.as_view(), name="create"),
  ]
  
subject: Fix deprecation warnings in keys/urls.py