code: def external(func):
      '''
      Mark function as external.
  
      :param func:
      :return:
      '''
  
      def f(*args, **kwargs):
          '''
          Stub.
  
          :param args:
          :param kwargs:
          :return:
          '''
          return func(*args, **kwargs)
  
      f.external = True
      f.__doc__ = func.__doc__
  
      return f external(func):
      '''
      Mark function as external.
  
      :param func:
      :return:
      '''
  
      def f(*args, **kwargs):
          '''
          Stub.
  
          :param args:
          :param kwargs:
          :return:
          '''
          return func(*args, **kwargs)
  
      f.external = True
      f.__doc__ = func.__doc__
  
      return f
docs: Mark function as external.
  
      :param func:
      :return: