在Python Click Library中使用布尔标志(命令行参数) [英] Using Boolean Flags in Python Click Library (command line arguments)

问题描述

我正在尝试为我的Python程序制作一个详细的标志. 目前，我正在这样做:

I'm trying to make a verbose flag for my Python program. Currently, I'm doing this:

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"Verbose on！".即使设置了"-v"参数也是如此.我的想法是log函数需要一个参数，但是我应该给它什么呢?另外，有没有办法检查是否在没有全局变量的情况下启用了详细标志?

It'll never print "Verbose on!" even when I set the '-v' argument. My thoughts are that the log function needs a parameter, but what do I give it? Also, is there a way to check whether the verbose flag is on without global variables?

推荐答案

因此，单击不仅仅是命令行解析器.它还分派和处理命令.因此，在您的示例中，log()函数永远不会返回到main().该框架的目的是修饰后的功能(即log())将完成所需的工作.

So click is not simply a command line parser. It also dispatches and processes the commands. So in your example, the log() function never returns to main(). The intention of the framework is that the decorated function, ie: log(), will do the needed work.

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.

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