哪一种是最有效的方法来遍历python中的列表? [英] Which is the most efficient way to iterate through a list in python?

问题描述

说我有一个物品清单:

x = [1, 2, 3, 4, 5]

我需要为每个项目执行一些功能.在某些情况下，我需要返回项目的索引.

I need to perform some functions for each of these items. In a certain case, I need to return the index of an item.

哪种是最好，最有效的方法?

Which is the best and most efficient way?

for item in list:
    ....

或

for i in range(len(list)):
    ....

推荐答案

for item in list:

它显然是函数调用较少的那个.

its obviously the one with fewer function calls.

如果您想在旅途中获取项目索引，请使用枚举像这样

If you want to get the index of items as you go use enumerate like this

for pos, item in enumerate(collection):

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