如何使具有互斥参数的Python函数? [英] How do I make a Python function with mutually exclusive arguments?

问题描述

我有一个Python类，它需要接受两个互斥参数之一.如果参数不是互斥的(即，如果两个或两个都不给出)，则将引发错误.

I have a Python class which needs to accept one of two mutually exclusive arguments. If the arguments are not exclusive, (ie: if both or neither are given), an error should be raised.

class OrgLocation:
    __init__(self, location_num=None, location_path=None):
        """location_num & location_path are mutually exclusive"""

在大多数情况下，最好的选择是制作两个单独的类.但是，我正在使用外部API ，该API 需要这两个属性是互斥的.

In most scenarios, the best option would be to make two separate classes. However, I am working with an external API which requires these two attributes to be mutually exclusive.

请求:

<OrgLocation LocationPathName="ROOT/BU/DIV/SL/DEPT/JOB" LocationNum="1234"/>

响应:

<Error Message="Use either LocationNum or LocationPathName but not both." ErrorCode="1186">

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类似的问题似乎表明 argparse 可以用于命令行界面中的互斥参数，但是我不确定如何将其应用于类构造器

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Similar questions seem to indicate that argparse can be used for mutually exclusive arguments in command-line interfaces, but I'm unsure how to apply this to a class constructor

如何创建带有互斥参数的Python函数?

How can I create a Python function with mutually exclusive arguments?

推荐答案

您可能想在 init 方法中创建测试，但更好的问题可能是...为什么?

You might want to create a test in the init method but a better question might be... Why?

if location_num is not None and location_path is not None:
    raise TheseParametersAreMutuallyExclusiveError()

您为什么要创建一个有多重目的的课程?为什么不创建单独的类?

Why would you make a class that has multiple purposes? Why not create separate classes?

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