python - 从列表中删除重复的列表元组

Question

我想编写一个脚本来获取类别列表并返回将类别分为 2 组的唯一方法。现在我有它的元组形式 (list_a, list_b)，其中 list_a 和 list_b 的联合表示类别的完整列表。

下面我展示了一个类别 ['A','B','C','D'] 的示例，我可以获得所有组。但是，有些是重复的 (['A'], ['B', 'C', 'D']) 表示与 (['B', 'C', 'D'], ['A' ]).如何只保留唯一的拆分？还有这篇文章的更好标题是什么？

import itertools
def getCompliment(smallList, fullList):
    compliment = list()
    for item in fullList:
        if item not in smallList:
            compliment.append(item)
    return compliment

optionList = ['A','B','C','D']
combos = list()
for r in range(1,len(optionList)):
    tuples = list(itertools.combinations(optionList, r))
    for t in tuples:
        combos.append((list(t),getCompliment(list(t), optionList)))

print(combos)

[(['A'], ['B', 'C', 'D']),
 (['B'], ['A', 'C', 'D']), 
 (['C'], ['A', 'B', 'D']),
 (['D'], ['A', 'B', 'C']),
 (['A', 'B'], ['C', 'D']),
 (['A', 'C'], ['B', 'D']),
 (['A', 'D'], ['B', 'C']),
 (['B', 'C'], ['A', 'D']),
 (['B', 'D'], ['A', 'C']),
 (['C', 'D'], ['A', 'B']),
 (['A', 'B', 'C'], ['D']),
 (['A', 'B', 'D'], ['C']),
 (['A', 'C', 'D'], ['B']),
 (['B', 'C', 'D'], ['A'])]

我需要以下内容:

[(['A'], ['B', 'C', 'D']),
 (['B'], ['A', 'C', 'D']), 
 (['C'], ['A', 'B', 'D']),
 (['D'], ['A', 'B', 'C']),
 (['A', 'B'], ['C', 'D']),
 (['A', 'C'], ['B', 'D']),
 (['A', 'D'], ['B', 'C'])]

Answer 1

你们很亲近。您需要的是一组 结果。

由于 set 元素必须是可散列的，而 list 对象是不可散列的，因此您可以改用 tuple。这可以通过对代码进行一些微不足道的更改来实现。

import itertools

def getCompliment(smallList, fullList):
    compliment = list()
    for item in fullList:
        if item not in smallList:
            compliment.append(item)
    return tuple(compliment)

optionList = ('A','B','C','D')
combos = set()
for r in range(1,len(optionList)):
    tuples = list(itertools.combinations(optionList, r))
    for t in tuples:
        combos.add(frozenset((tuple(t), getCompliment(tuple(t), optionList))))

print(combos)

{frozenset({('A',), ('B', 'C', 'D')}),
 frozenset({('A', 'C', 'D'), ('B',)}),
 frozenset({('A', 'B', 'D'), ('C',)}),
 frozenset({('A', 'B'), ('C', 'D')}),
 frozenset({('A', 'C'), ('B', 'D')}),
 frozenset({('A', 'D'), ('B', 'C')}),
 frozenset({('A', 'B', 'C'), ('D',)})}

如果您需要将结果转换回列表的列表，这可以通过列表理解来实现:

res = [list(map(list, i)) for i in combos]

[[['A'], ['B', 'C', 'D']],
 [['B'], ['A', 'C', 'D']],
 [['A', 'B', 'D'], ['C']],
 [['A', 'B'], ['C', 'D']],
 [['B', 'D'], ['A', 'C']],
 [['B', 'C'], ['A', 'D']],
 [['A', 'B', 'C'], ['D']]]