将重复项保留在Python列表中 [英] Keep duplicates in a list in Python

问题描述

我知道这可能是一个简单的答案，但我不知道.在Python中将重复项保留在列表中的最佳方法是什么?

I know this is probably an easy answer but I can't figure it out. What is the best way in Python to keep the duplicates in a list:

x = [1,2,2,2,3,4,5,6,6,7]

输出应为:

[2,6]

我找到了此链接:查找(并保留)子列表的重复项在python 中，但是我对Python还是一个相对较新的东西，我无法将其用于简单的列表.

I found this link: Find (and keep) duplicates of sublist in python, but I'm still relatively new to Python and I can't get it to work for a simple list.

推荐答案

如果列表已经排序，这是一种简短的方法:

This is a short way to do it if the list is sorted already:

x = [1,2,2,2,3,4,5,6,6,7]

from itertools import groupby
print [key for key,group in groupby(x) if len(list(group)) > 1]

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