validators.py 文件源码

def validate_binary_string(ctx, param, value):
    """
        Ensure that a binary string only has 1's and 0's

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

    valid_characters = '10'

    # If we string the value of valid characters, are there
    # any other characters left over?
    left_overs = value.strip(valid_characters)

    # Except if there are characters left
    if left_overs:
        raise click.BadParameter('Only the characters "{}" is considered valid bitsring input.'
                                 ' The following were invalid: {}'.format(valid_characters, left_overs))

    return value