old_contents: PROVIDER_LOOKUP = dict()
  
  
  def get_service(name):
      """Given a service name, return the provider class"""
      return PROVIDER_LOOKUP[name]()
new_contents: # This dict is built through the metaclass applied to ExternalProvider.
  #   It is intentionally empty here, and should remain empty.
  PROVIDER_LOOKUP = dict()
  
  
  def get_service(name):
      """Given a service name, return the provider class"""
      return PROVIDER_LOOKUP[name]()
subject: Add documentation