code: def random_list_elem(str_list):
          
          if isinstance(str_list, list):
              for elem in str_list:
                  if not isinstance(elem, str):
                      raise TypeError("list element can only be string")
              return SeedString(random.choice(str_list))
          return None
docs: :param str_list: a pre-defined string list
          :return: SeedString()