code: def score(text, *score_functions):
      
      if not score_functions:
          raise ValueError("score_functions must not be empty")
  
      return statistics.mean(func(text) for func in score_functions)
docs: Score ``text`` using ``score_functions``.
  
      Examples:
          >>> score("abc", function_a)
          >>> score("abc", function_a, function_b)
  
      Args:
          text (str): The text to score
          *score_functions (variable length argument list): functions to score with
  
      Returns:
          Arithmetic mean of scores
  
      Raises:
          ValueError: If score_functions is empty