如何在Python列表中切换两个项目的位置? [英] How to switch position of two items in a Python list?

问题描述

我无法在网上找到一个很好的解决此问题的方法(可能是因为switch，position，list和Python都是这样的重载词).

I haven’t been able to find a good solution for this problem on the net (probably because switch, position, list and Python are all such overloaded words).

这很简单-我有以下列表:

It’s rather simple – I have this list:

['title', 'email', 'password2', 'password1', 'first_name', 'last_name', 'next', 'newsletter']

我想切换'password2'和'password1'的位置-不知道它们的确切位置，只知道它们紧挨着，而password2在最前面.

I’d like to switch position of 'password2' and 'password1' – not knowing their exact position, only that they’re right next to one another and password2 is first.

我已经完成了一些比较漫长的列表下标操作，但是我想知道是否可以提出一些更优雅的方法?

I’ve accomplished this with some rather long-winded list-subscripting, but I wondered its possible to come up with something a bit more elegant?

推荐答案

    i = ['title', 'email', 'password2', 'password1', 'first_name', 
         'last_name', 'next', 'newsletter']
    a, b = i.index('password2'), i.index('password1')
    i[b], i[a] = i[a], i[b]

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