python 查找列表中重复元素以及重复元素的次数

from collections import Counter

a = [1, 2, 3, 4, 3, 2, "奔奔", "benben", "奔奔"]
b = dict(Counter(a))
# 只展示重复元素
print ([key for key,value in b.items() if value > 1])
# 展现重复元素和重复次数
print ({key:value for key,value in b.items()if value > 1})

 运行结果：

[2, 3, '奔奔']
{2: 2, 3: 2, '奔奔': 2}