old_contents: import sys
  
  from django.conf import settings
  from django.conf.urls import url
  from django.core.management import execute_from_command_line
  from django.http import HttpResponse
  
  settings.configure(
      DEBUG=True,
      ROOT_URLCONF=sys.modules[__name__],
  )
  
  
  def index(request):
      return HttpResponse('<h1>A minimal Django response!</h1>')
  
  urlpatterns = [
      url(r'^$', index),
  ]
  
  if __name__ == '__main__':
      execute_from_command_line(sys.argv)
  
new_contents: import sys
  
  from django.conf import settings
  from django.urls import path
  from django.core.management import execute_from_command_line
  from django.http import HttpResponse
  
  settings.configure(
      DEBUG=True,
      ROOT_URLCONF=sys.modules[__name__],
  )
  
  
  def index(request):
      return HttpResponse('<h1>A minimal Django response!</h1>')
  
  
  urlpatterns = [
      path(r'', index),
  ]
  
  if __name__ == '__main__':
      execute_from_command_line(sys.argv)
  
subject: Update `urlpatterns` for 4.0 removal of `django.conf.urls.url()`