old_contents: from django.conf.urls import include, url
  from django.contrib import admin
  
  urlpatterns = [
      url(r'^admin/', include(admin.site.urls)),
  ]
  
new_contents: from django.conf.urls import include, url
  from django.contrib import admin
  import django
  
  admin_urls = (admin.site.urls if (django.VERSION[0] == 2) else include(admin.site.urls))
  
  urlpatterns = [
      url(r'^admin/', admin_urls),
  ]
  
subject: make urls Django 2 compatible