main.py 文件源码

def _find_subparsers(self, subparsers, actions_module):
        """Find subparsers by looking at *_shell files."""
        help_formatter = argparse.HelpFormatter
        for attr in (a for a in dir(actions_module) if a.startswith('do_')):
            command = attr[3:].replace('_', '-')
            callback = getattr(actions_module, attr)
            desc = callback.__doc__ or ''
            action_help = desc.strip()
            arguments = getattr(callback, 'arguments', [])
            subparser = (subparsers.add_parser(command,
                                               help=action_help,
                                               description=desc,
                                               add_help=False,
                                               formatter_class=help_formatter)
                         )
            subparser.add_argument('-h', '--help',
                                   action='help',
                                   help=argparse.SUPPRESS)
            self.subcommands[command] = subparser
            for (args, kwargs) in arguments:
                subparser.add_argument(*args, **kwargs)
            subparser.set_defaults(func=callback)