需要python argparse add_argument_group [英] python argparse add_argument_group required

问题描述

这个问题

argparse:需要两个参数之一

argparse: require either of two arguments

我找到了想要的解决方案的参考，但这是不对的.

I find a reference to the solution I want, but it isn't right.

我需要至少显示2个选项中的1个，option1，option2或同时显示这两个选项...

I need at least 1 of 2 options to be present, option1, option2 or both...

add_argument_group函数没有必需的参数. add_mutually_exclusive函数具有它，但是它迫使我在这两个选项之间进行选择，这不是我想要的.

The add_argument_group function doesn't have a required argument. The add_mutually_exclusive function has it, but it forces me to choose between the 2 options, which is not what I want.

rds

推荐答案

argument_group仅控制帮助显示.它不影响解析或检查错误. mutually_exclusive_group影响使用情况显示并测试是否发生，但是请注意，它的逻辑不是您想要的.

argument_group just controls the help display. It does not affect the parsing or check for errors. mutually_exclusive_group affects usage display and tests for occurrence, but as you note, its logic is not what you want.

存在一个Python错误问题，要求某种形式的嵌套包含"组.但是，允许嵌套以及所有版本的和/或/和/或xor逻辑的通用形式并不是一件容易的事.

There is a Python bug issue requesting some form of nested 'inclusive' group. But a general form that allows nesting and all versions of and/or/xor logic is not a trivial addition.

我认为您最简单的解决方案是在解析后测试args.如果默认设置混合使用错误，则引发错误.

I think your simplest solution is to test the args after parsing. If there is a wrong mix of defaults, then raise an error.

假定两个参数的默认值为None:

Assuming the default for both arguments is None:

if args.option1 is None and args.option2 is None:
    parser.error('at least one of option1 and option2 is required')

什么是有意义的用法行? required mutually exclusive' uses(opt1 | opt2).(opt1& opt2)might indicate that both are required. Your case is a非独占或`

What would be meaningful usage line? required mutually exclusive' uses(opt1 | opt2).(opt1 & opt2)might indicate that both are required. Your case is anon-exclusive or`

usage: PROG [-h] (--opt1 OPT1 ? --opt2 OPT2)

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