validators.py 文件源码

def validate_hex_string(ctx, param, value):
    """
        Ensure that a value is valid hex

        :param ctx:<class 'click.core.Context'>
        :param param:<class 'click.core.Option'>
        :param value:str
        :return:str
    """

    try:
        int(value, 16)
    except ValueError:
        raise click.BadParameter('\'{}\' is not a valid hex string.'.format(value))

    return value