__init__.py 文件源码

def __init__(self, option_strings, nargs=1, dest='vmnames', help=None,
                 **kwargs):
        # pylint: disable=redefined-builtin
        if help is None:
            if nargs == argparse.OPTIONAL:
                help = 'at most one running domain'
            elif nargs == 1:
                help = 'running domain name'
            elif nargs == argparse.ZERO_OR_MORE:
                help = 'zero or more running domains'
            elif nargs == argparse.ONE_OR_MORE:
                help = 'one or more running domains'
            elif nargs > 1:
                help = '%s running domains' % nargs
            else:
                raise argparse.ArgumentError(
                    nargs, "Passed unexpected value {!s} as {!s} nargs ".format(
                        nargs, dest))
        super(RunningVmNameAction, self).__init__(
            option_strings, dest=dest, help=help, nargs=nargs, **kwargs)