itertools.product() 的独特共现对

Unique co-occurrence pairs with itertools.product()

我有一个单词列表,例如:

[man, walk, ball]

并且我希望产生它们的共现;即:

[('man', 'walk'), ('man', 'ball'), ('walk', 'ball')]

我使用以下代码:

from itertools import product
my_list = [man, walk, ball]
list(product(my_list, my_list))

这给了我:

[('man', 'man'), ('man', 'walk'), ('man', 'ball'), ('walk', 'man'), ('walk', 'walk'), ('walk', 'ball'), ('ball', 'man'), ('ball', 'walk'), ('ball', 'ball')]

我想知道如何省略重复的对?

尝试 itertools.combinations(iterable, r):

>>> import itertools
>>> list(itertools.combinations(['man', 'walk', 'ball'], 2))
[('man', 'walk'), ('man', 'ball'), ('walk', 'ball')]