如何根据 Python3 中的另一个列表对列表中的元素进行分组?

How to group elements in a list in with respect to another list in Python3?

我有 2 个列表

in1=[1,1,1,2,2,3,4,4,4,5,5]

in2=['a','b','c','d','e','f','g','h','i','j','k']

我想根据第一个列表中的相同元素对第二个列表进行分组,即

输出必须是

out=[['a','b','c'],['d','e'],['f'],['g','h','i'],['j','k']]

说明:第一个列表的前 3 个元素相同,所以我想将第二个列表的前 3 个元素组合在一起(依此类推)

如果有人能帮忙,那就太好了!

~谢谢

只是 zip 列表,然后 itertools 来救援。

from itertools import groupby

in1 = [1,1,1,2,2,3,4,4,4,5,5]
in2 = ['a','b','c','d','e','f','g','h','i','j','k']    

result = [[c for _, c in g] for _, g in groupby(zip(in1, in2), key=lambda x: x[0])]
print(result)
# [['a', 'b', 'c'], ['d', 'e'], ['f'], ['g', 'h', 'i'], ['j', 'k']]

itertools解决方案:

in1 = [1,1,1,2,2,3,4,4,4,5,5]
in2 = ['a','b','c','d','e','f','g','h','i','j','k']

result = [[]]
key = in1[0]

for k, v in zip(in1, in2):
    if k != key:
        result.append([])
        key = k
    result[-1].append(v)

print(result)
# [['a', 'b', 'c'], ['d', 'e'], ['f'], ['g', 'h', 'i'], ['j', 'k']]