code: def check_type_and_size_of_param_list(param_list, expected_length):
      
      try:
          assert isinstance(param_list, list)
          assert len(param_list) == expected_length
      except AssertionError:
          msg = "param_list must be a list containing {} elements."
          raise ValueError(msg.format(expected_length))
  
      return None
docs: Ensure that param_list is a list with the expected length. Raises a helpful
      ValueError if this is not the case.