cmdoptions.py 文件源码

def exists_action():
    return Option(
        # Option when path already exist
        '--exists-action',
        dest='exists_action',
        type='choice',
        choices=['s', 'i', 'w', 'b'],
        default=[],
        action='append',
        metavar='action',
        help="Default action when a path already exists: "
        "(s)witch, (i)gnore, (w)ipe, (b)ackup.")