如何插入python嵌套列表

问题描述

我想将一个项目插入列表中的列表中.我想知道是否有人可以给我看.

I want to insert an item into a list inside a list. I'm wondering if someone can show me.

list5 = [[], [(1,2,3,4), 2, 5]]
print("1. list5", list5)
list5.insert(0, (2,5,6,8))
print("2. list5", list5)

Output:
1. list5 [[], [(1, 2, 3, 4), 2, 5]]
2. list5 [(2, 5, 6, 8), [], [(1, 2, 3, 4), 2, 5]]

我想要:

2. list5 [[(2, 5, 6, 8)], [(1, 2, 3, 4), 2, 5]]

不幸的是，字典无法正常工作.

A dictionary unfortunately won't work.

推荐答案

问题是您正试图插入不正确的列表list5作为列表的第一个元素.您必须访问列表的第一个元素并将其插入该列表.可以使用以下代码完成

The problem is you are trying to insert as the first element of the list, list5 which is incorrect. You have to access the first element of the list and insert it to that list. This can be done using the following code

>>> list5 = [[], [(1,2,3,4), 2, 5]]
>>> print("1. list5", list5)
1. list5 [[], [(1, 2, 3, 4), 2, 5]]
>>> list5[0].insert(0, (2,5,6,8))
>>> print("2. list5", list5)
2. list5 [[(2, 5, 6, 8)], [(1, 2, 3, 4), 2, 5]]

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