列表中Python中的无序对(对集) [英] Unordered Pairs (pair sets) in Python from a list

问题描述

我有一个物品清单

 alist = ['dog', 'cat', 'fish']

我想返回所有唯一的无序对，所以在这种情况下:

I want to return all unique unordered pairs, so in this case:

 (dog,cat)(dog,fish)(fish,cat)

itertools.combinations没有考虑到无序状态，所以这不是我所需要的.

itertools.combinations does not take into account the unordered condition, so it is not quite what I need.

推荐答案

itertools 哪里出问题?

import itertools

alist = ['dog', 'cat', 'fish']
for result in itertools.combinations(alist, 2):
    print result

输出:

('dog', 'cat')
('dog', 'fish')
('cat', 'fish')

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