input: def get_stats_for_string(string):
      """Calculates the maximum, minimum and mean number of elements in a given string.
      >>> get_stats_for_string("abcdef")
      ('f', 'a', 99.5)
      >>> get_stats_for_string("ABC")
      ('C', 'A', 67.0)
      """
      num_elements = len(string)
      max_element = max(string)
      min_element = min(string)
      mean_element = sum(map(ord, string)) / num_elements
      return (max_element, min_element, mean_element)
output:     num_elements = len(string)
      max_element = max(string)
      min_element = min(string)
      mean_element = sum(map(ord, string)) / num_elements
      return (max_element, min_element, mean_element)