如何在字典中的特定键之间交换值? [英] How to exchange values between specific keys in a dictionary?

问题描述

假设您有一本这样的字典:

Let's say you have a dictionary like this:

d = {
    'A': 'content_for_A',
    'B': 'content_for_B'
}

在两个条目之间交换值的最有效方法是什么?所以结果应该是这样的:

What is the most efficient way to swap the values between the two entries? So the result should be like this:

d = {
    'A': 'content_for_B',
    'B': 'content_for_A'
}

当然，您可以创建一个新字典 d2 并执行 d2 ['A'] = d ['B'];d2 ['B'] = d ['A'] ，但这是推荐的方法吗?还是有一种无需创建新字典的有效方法?

Of course, you can create a new dictionary d2 and do d2['A'] = d['B']; d2['B'] = d['A'] but is this the recommended way or is there an efficient way without the need to create a new dictionary?

推荐答案

d['A'], d['B'] = d['B'], d['A']

元组拆包是Python中一个很好的工具，可以在不创建中间变量的情况下交换两个对象的值.

Tuple unpacking is a great tool in Python to swap the values of two objects without the need of creating an intermediary variable.

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