docs: def __parse_main(self, args):
          """Parse the main arguments only. This is a work around for python 2.7
          because argparse does not allow to parse arguments without subparsers
          """
          if six.PY2:
              self._subparsers_action.add_parser("__dummy")
              return super(FuncArgParser, self).parse_known_args(
                  list(args) + ['__dummy'])
          return super(FuncArgParser, self).parse_known_args(args)