按值分组列表 [英] Group list by values

问题描述

假设我有一个这样的列表:

Let's say I have a list like this:

list = [["A",0], ["B",1], ["C",0], ["D",2], ["E",2]]

我如何最优雅地将其分组以在Python中获得此列表输出:

How can I most elegantly group this to get this list output in Python:

list = [["A", "C"], ["B"], ["D", "E"]]

所以这些值按次值分组，但顺序保留下来...

So the values are grouped by the secound value but the order is preserved...

推荐答案

values = set(map(lambda x:x[1], list))
newlist = [[y[0] for y in list if y[1]==x] for x in values]

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