如何仅打印python列表中的重复元素 [英] How to print only the duplicate elements in python list

问题描述

是否有任何内置方法可以打印 python 列表中存在的重复元素.

Is there any inbuilt way to print duplicate elements present in a python list.

我可以为此编写程序.

我正在寻找的是是否有任何内置方法或相同的东西.

All I'm searching for is if there is any inbuilt method or something for the same.

例如:

对于输入[4,3,2,4,5,6,4,7,6,8]

我需要操作 4,6

推荐答案

collections 可以解决这个问题

There is the Counter class from collections that does the trick

from collections import Counter


lst = [4,3,2,4,5,6,4,7,6,8]
d =  Counter(lst)  # -> Counter({4: 3, 6: 2, 3: 1, 2: 1, 5: 1, 7: 1, 8: 1})
res = [k for k, v in d.items() if v > 1]
print(res)
# [4, 6]

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