如何在for循环期间修改列表条目? [英] How to modify list entries during for loop?

问题描述

现在我知道在迭代循环期间修改列表是不安全的.但是，假设我有一个字符串列表，并且我想剥离这些字符串本身.替换可变值算作修改吗?

Now I know that it is not safe to modify the list during an iterative looping. However, suppose I have a list of strings, and I want to strip the strings themselves. Does replacement of mutable values count as modification?

推荐答案

这被认为是糟糕的形式.如果您需要保留对列表的现有引用，请改用列表理解，并使用切片分配.

It's considered poor form. Use a list comprehension instead, with slice assignment if you need to retain existing references to the list.

a = [1, 3, 5]
b = a
a[:] = [x + 2 for x in a]
print(b)

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