单击带有可选参数的工具

本文介绍了单击带有可选参数的工具的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想编写一个以FILENAME作为参数的CLI hello ，除非指定了-s STRING选项，否则将直接处理STRING.该程序应打印 hello {NAME} ，其中名称是通过STRING给出的，或者被视为文件FILENAME的内容.

I want to write a CLI hello that takes a FILENAME as an argument except when the option -s STRING is given, in which case the STRING is processed directly. The program should print hello {NAME} where name is either given via the STRING or taken to be the contents of the file FILENAME.

示例:

$ cat myname.txt john $ hello myname.txt hello john $ hello -s paul hello paul

可能的解决方法是使用两个选项:

A possible workaround is to use two options:

@clickmand() @click.option("-f", "--filename", type=str) @click.option("-s", "--string", type=str) def main(filename: str, string: str): if filename: ... if string: ....

但这意味着我必须用一个标志调用 hello .

but that means that I must call hello with a flag.

推荐答案

您可以使用Click 参数，并使其不需要，例如:

You can use a Click argument and make it not required like:

import click @clickmand() @click.argument('filename', required=False) @click.option("-s", "--string") def main(filename, string): if None not in (filename, string): raise click.ClickException('filename argument and option string are mutually exclusive!') click.echo(f'Filename: {filename}') click.echo(f'String: {string}')