别停下脚步幸福
问题描述
我有一个包含数字的列表(子列表)列表，我只想将它们保留在所有(子)列表中.
i have a list of lists (sublist) that contains numbers and i only want to keep those exists in all (sub)lists.
例子:
x = [ [1, 2, 3, 4], [3, 4, 6, 7], [2, 3, 4, 6, 7]] output => [3, 4]
我该怎么做?
推荐答案
common = set(x[0])
for l in x[1:]:
common &= set(l)
print list(common)
或:
import operator print reduce(operator.iand, map(set, x))
