docs: def add_many_to_dict_val_list(dict_obj, key, val_list):
      """Adds the given value list to the list mapped by the given key.
      If the key is missing from the dict, the given mapping is added.
  
      Example
      -------
      >>> dict_obj = {'a': [1, 2]}
      >>> add_many_to_dict_val_list(dict_obj, 'a', [2, 3])
      >>> print(dict_obj['a'])
      [1, 2, 2, 3]
      >>> add_many_to_dict_val_list(dict_obj, 'b', [2, 3])
      >>> print(dict_obj['b'])
      [2, 3]
      """
      try:
          dict_obj[key].extend(val_list)
      except KeyError:
          dict_obj[key] = list(val_list)