Method _warning

Lib/argparse.py:2782–2784

(self, message)

        self.exit(2, _('%(prog)s: error: %(message)s\n') % args)

    def _warning(self, message):
        args = {'prog': self.prog, 'message': message}
        self._print_message(_('%(prog)s: warning: %(message)s\n') % args, _sys.stderr)