shell.py 文件源码

def _find_actions(self, subparsers, actions_module):
        for attr in (a for a in dir(actions_module) if a.startswith('do_')):
            # Replace underscores with hyphens in the commands
            # displayed to the user
            command = attr[3:].replace('_', '-')
            callback = getattr(actions_module, attr)
            desc = callback.__doc__ or ''
            help = desc.strip().split('\n')[0]
            arguments = getattr(callback, 'arguments', [])

            subparser = subparsers.add_parser(command,
                                              help=help,
                                              description=desc,
                                              add_help=False,
                                              formatter_class=HelpFormatter
                                              )
            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)