使用对象id作为Python中对象的散列 [英] Using object id as a hash for objects in Python

问题描述

使用对象 id 作为散列键（通过 __ hash __ ）能够能够明智地使用为程序的单个实例散列另外可变的对象？使用对象属性会更好，但它们都是可变的，并且可以改变。

在我看到设置实例，我想知道是否明智。

解决方案

是的，只要您还定义 __ eq __ （大概 __ ne __ ！ - ）与此一致。 IOW，没关系，只要你认为 a == b 与完全相同就是b ！ - ）

Is it wise to use the object id as a hash key (via. the __hash__) to be able to hash an otherwise mutable object for a single instance of a program? Using the object attributes would be nicer but they're all mutable and can change.

This occurred to me while looking at Sets of instances and I'm wondering if it's wise.

解决方案

Yes, as long as you also define __eq__ (and presumably __ne__!-) consistently with that. IOW, it's fine, as long as you're fine with a==b meaning exactly the same as a is b!-)

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