从python中的multi-d数组中删除重复的条目 [英] removing duplicate entries from multi-d array in python

问题描述

我有一个二维数组

 xx=[[a,1],[b,2],[c,3]]

现在，我正在尝试从中删除重复的条目.对于简单的一维数组，像

Now I'm trying to remove duplicate entries from it. For simple 1-D array, simple code like

xx=list(set(xx))

会工作.但是尝试在二维元素上设置会出现错误

would work. But trying set on 2-d elements gives an error

temp = set(xx)
TypeError: unhashable type: 'list'

一种解决方法是序列化xx个元素，然后在新数组上执行list(set())，然后再次反序列化所有元素.

One workaround would be to serialize xx elements, and then do a list(set()) on new array and then unserialize all the elements back again.

python中有什么解决方案吗?

Is there any solution in python?

推荐答案

将元素转换为元组，然后使用set.

Convert elements to tuple and then use set.

>>> xx=[['a',1],['b',2],['c',3],['c',3]]
>>> set(tuple(element) for element in xx)
set([('a', 1), ('b', 2), ('c', 3)])
>>> 

与列表不同，可以对哈希进行哈希处理.因此.完成后，将元素转换回列表.将所有内容放在一起:

Tuples, unlike lists, can be hashed. Hence. And once you are done, convert the elements back to list. Putting everything together:

>>> [list(t) for t in set(tuple(element) for element in xx)]
[['a', 1], ['b', 2], ['c', 3]]

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