在Python中使用布尔标志单击库(命令行参数)

Question

我正试图为我的Python程序制作一个详细的标志.目前,我这样做:

import click

#global variable
verboseFlag = False

#parse arguments
@click.command()
@click.option('--verbose', '-v', is_flag=True, help="Print more output.")
def log(verbose):
    global verboseFlag
    verboseFlag = True

def main():    
    log()        
    if verboseFlag:
         print("Verbose on!")

if __name__ == "__main__":
    main()

它永远不会打印"详细!" 即使我设置'-v'参数.我的想法是日志功能需要一个参数,但我该给它什么？另外,有没有办法检查详细标志是否在没有全局变量的情况下打开？

Answer 1

所以click不仅仅是一个命令行解析器.它还调度和处理命令.所以在你的例子中,log()函数永远不会返回main().框架的意图是装饰功能,即:log(),将完成所需的工作.

码:

import click

@click.command()
@click.option('--verbose', '-v', is_flag=True, help="Print more output.")
def log(verbose):
    click.echo("Verbose {}!".format('on' if verbose else 'off'))


def main(*args):
    log(*args)

测试代码:

if __name__ == "__main__":
    commands = (
        '--verbose',
        '-v',
        '',
        '--help',
    )

    import sys, time

    time.sleep(1)
    print('Click Version: {}'.format(click.__version__))
    print('Python Version: {}'.format(sys.version))
    for cmd in commands:
        try:
            time.sleep(0.1)
            print('-----------')
            print('> ' + cmd)
            time.sleep(0.1)
            main(cmd.split())

        except BaseException as exc:
            if str(exc) != '0' and \
                    not isinstance(exc, (click.ClickException, SystemExit)):
                raise

结果:

Click Version: 6.7
Python Version: 3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 18:11:49) [MSC v.1900 64 bit (AMD64)]
-----------
> --verbose
Verbose on!
-----------
> -v
Verbose on!
-----------
> 
Verbose off!
-----------
> --help
Usage: test.py [OPTIONS]

Options:
  -v, --verbose  Print more output.
  --help         Show this message and exit.

Answer 2

上面的答案很有帮助，但这是我最终使用的。我想我会分享，因为很多人都在看这个问题：

@click.command()
@click.option('--verbose', '-v', is_flag=True, help="Print more output.")
def main(verbose):
    if verbose:
        # do something

if __name__ == "__main__":
    # pylint: disable=no-value-for-parameter
    main()