list[x::y] 有什么作用? [英] What does list[x::y] do?

问题描述

可能的重复:
Python 切片表示法的优秀入门

我最近阅读了一些示例代码，也阅读了很多网站，但我似乎无法正确查询以提供我正在寻找的答案.如果有人可以帮助我，我将不胜感激.

I've been reading over some sample code lately and I've read quite a few websites but I just can't seem to get the query right to give me an answer I'm looking for. If anyone could help me out I'd appreciate it.

推荐答案

It slices

x[startAt:endBefore:skip]

如果您使用 skip = 2，则列表中以 startAt 开始并以 endBefore 结束的所有其他元素都将被选中.[记住:索引存在于列表元素之间]

if you use skip = 2, every other element the list beginning at startAt and ending at endBefore will be selected. [Remember: indices live BETWEEN list elements]

要查看此内容，请输入

x = range(100)

在 Python 提示符下.那就试试这些吧

at the Python prompt. Then try these things

x[::2]
x[::3]
x[10:40:6]

看看会发生什么.

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