分配一个值以按索引列出超出范围 [英] Assigning a value to list by index out of range

问题描述

mylist = ["a", "apple", "b", "ball", "c", "cat"]
mylist[6] = "value"
print(mylist)

错误:

IndexError: list assignment index out of range

我记得在javascript中按索引分配值，在python中不起作用吗?

I remember assigning values by index in javascript, it doesn't work in python?

推荐答案

在python中，如果索引不存在，则单个分配不起作用.Javascript数组是稀疏" ，您可以将值存储在任何索引中.取而代之的是，python列表具有定义的大小，并且仅在现有索引中才允许赋值.

In python single assignment does not work if the index does not exist. Javascript arrays are "sparse", you can stash a value at any index. Instead, python lists have a defined size, and assignment is only allowed in existing indices.

如果要在末尾添加，请使用 mylist.append(value)，

If you want to add at the end, use mylist.append(value),

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