📅  最后修改于: 2022-03-11 14:46:36.491000             🧑  作者: Mango
代码示例2
a = [1,2,3,2,1,5,6,5,5,5]
import collections
print([item for item, count in collections.Counter(a).items() if count > 1])
## [1, 2, 5]