对列表进行升序然后降序排序 [英] Sort list of lists ascending and then descending

问题描述

如果我有一个包含看起来像这样的列表的列表

If I have a list that contains a list that looks like this

['a',1] ['a',2] ['a',3] ['b',1] ['b',2] ['b',3]

如何对它们进行排序，以便元素 0 降序排序，元素 1 升序排序，以便结果看起来像

How can I sort them so that element 0 is sorted descending and element 1 sorted ascending so the result would look like

['b',1] ['b',2] ['b',3] ['a',1] ['a',2] ['a',3]

使用 itemgetter 我可以在元素 0 上反向传递，但我然后诉诸于元素，当然它破坏了以前的排序.我不能做组合键，因为它需要先降序然后升序.

Using itemgetter I can pass in reverse on element 0 but I then resort against element to of course it ruins the previous sort. I can't do a combined key since it needs to first sort descending and then ascending.

推荐答案

L = [['a',1], ['a',2], ['a',3], ['b',1], ['b',2], ['b',3]]
L.sort(key=lambda k: (k[0], -k[1]), reverse=True)

L 现在包含:

[['b', 1], ['b', 2], ['b', 3], ['a', 1], ['a', 2], ['a', 3]]

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