code: def parser(self):
          
          parser = argparse.ArgumentParser(description=self.description,
                                           epilog=self.epilog)
          parser.add_argument('--version',
                              action='version',
                              version=self.version)
          return self.add_to_parser(parser)
docs: Create the argparser_ for this configuration by adding all
          settings via the :meth:`Setting.add_argument` method.
  
          :rtype: an instance of :class:`ArgumentParser`.