argparse.py 文件源码

def sign_options():
    def callback(option, opt_str, value, parser, sign_str):
        if parser.values.sign_str not in [None, sign_str]:
            raise optparse.OptionValueError(
                'Cannot give more than one of --ack, --sign, --review')
        parser.values.sign_str = sign_str
    return [
        opt('--sign', action = 'callback', dest = 'sign_str', args = [],
            callback = callback, callback_args = ('Signed-off-by',),
            short = 'Add "Signed-off-by:" line', long = """
            Add a "Signed-off-by:" to the end of the patch."""),
        opt('--ack', action = 'callback', dest = 'sign_str', args = [],
            callback = callback, callback_args = ('Acked-by',),
            short = 'Add "Acked-by:" line', long = """
            Add an "Acked-by:" line to the end of the patch."""),
        opt('--review', action = 'callback', dest = 'sign_str', args = [],
            callback = callback, callback_args = ('Reviewed-by',),
            short = 'Add "Reviewed-by:" line', long = """
            Add a "Reviewed-by:" line to the end of the patch.""")]