Unordered Pairs (pair sets) in Python from a list [closed]

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I have a list of items

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

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

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

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

回答1:

Where is your problem with itertools?

import itertools

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

output:

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

来源：https://stackoverflow.com/questions/35047737/unordered-pairs-pair-sets-in-python-from-a-list