如何创建具有所有相同值但可以更改其中的多个元素的二维列表?(Python) [英] How to create a 2d list with all same values but can alter multiple elements within? (python)

问题描述

我正在尝试创建一个包含这种确切格式的列表:[[2],[2],[2],[2],[2],[2],[2],[2],[2],[2]]

当list[3][0] = 9被调用时，列表变成[[2],[9],[2],[9],[2],[9],[2],[9],[2],[9]]

我首先如何创建列表，以便我只用一行更改这么多元素?

解决方案

>>>L = [[2], [2]] * 5>>>升[[2], [2], [2], [2], [2], [2], [2], [2], [2], [2]]>>>L[3][0] = 9>>>升[[2], [9], [2], [9], [2], [9], [2], [9], [2], [9]]

这是因为相同的两个列表一遍又一遍地重复

<预><代码>>>>[id(x) for x in L][140053788793352，140053788793288，140053788793352，140053788793288，140053788793352，140053788793288，140053788793352，140053788793288，140053788793352，140053788793288]

I'm trying to create a list that holds this exact format: [[2],[2],[2],[2],[2],[2],[2],[2],[2],[2]]

and when list[3][0] = 9 is called, the list becomes [[2],[9],[2],[9],[2],[9],[2],[9],[2],[9]]

How do I create the list in the first place that will allow me to change these many elements with only one line?

解决方案

>>> L = [[2], [2]] * 5
>>> L
[[2], [2], [2], [2], [2], [2], [2], [2], [2], [2]]
>>> L[3][0] = 9
>>> L
[[2], [9], [2], [9], [2], [9], [2], [9], [2], [9]]

This is because the same two lists are repeated over and over

>>> [id(x) for x in L]
[140053788793352, 140053788793288, 140053788793352, 140053788793288, 140053788793352, 140053788793288, 140053788793352, 140053788793288, 140053788793352, 140053788793288]

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