old_contents: from django.conf.urls import include, url
  
  urlpatterns = [
      url('', include('rest_friendship.urls', namespace='rest_friendship')),
  ]
  
new_contents: from django.urls import path, include
  
  urlpatterns = [
      path('', include(('rest_friendship.urls', 'rest_friendship'), namespace='rest_friendship')),
  ]
  
subject: Fix deprecated url import, (to path)