枚举python中字典键的2种组合

Question

I wish to enumerate over all 2 combinations of dictionary keys in python. For example if I have some dictionary like:

di = {'a': [1, 2 ,5], 'b': "haha", 'c': 34, 'd': 24}

Now, suppose each key were indexed by its order. For example a would be 1 b would be 2 and so forth.

Then we could do the familiar iteration to get all 2-combinations:

for i in range(len(di)):
    for j in range(i+1, len(di)):

However, the dictionary keys are not indexed as above. So how do I perform this iteration?

Answer 1

itertools.combinations可能会有帮助。

Answer 2

As long as you don't want special handling to split up that list keyed to 'a':

list(itertools.combinations(di.values(),2))
Out[6]: 
[([1, 2, 5], 34),
 ([1, 2, 5], 'haha'),
 ([1, 2, 5], 24),
 (34, 'haha'),
 (34, 24),
 ('haha', 24)]

(python 3 syntax)