python - 如何对Python嵌套列表中的数据进行分类

Question

我需要对 python 嵌套列表进行分类，如下所示。

[
['amal', 20],
['kamal', 25],
['amal', 30]
]

答案应该是，

[amal,20,30]
[kamal,25]

Answer 1

您可以使用itertools.groupby根据第一个值对子列表进行分组:

from itertools import groupby
from operator import itemgetter as g

[[k, *(i[1] for i in v)] for k,v in groupby(sorted(l, key=g(0)), g(0))]
# [['amal', 20, 30], ['kamal', 25]]