docs: def _get_args_name_from_parser(parser):
      """Retrieve the name of the function argument linked to the given parser.
  
      Args:
          parser: a function parser
      """
      # Retrieve the 'action' destination of the method parser i.e. its
      # argument name. The HelpAction is ignored.
      return [action.dest for action in parser._actions if not
              isinstance(action, argparse._HelpAction)]