如何在Python中获取列表的最后一项? [英] How to get last items of a list in Python?

问题描述

我需要列表的最后9个数字，而且我敢肯定有一种切片方法，但是我似乎无法理解.我可以得到这样的前9个:

I need the last 9 numbers of a list and I'm sure there is a way to do it with slicing, but I can't seem to get it. I can get the first 9 like this:

num_list[0:9]

推荐答案

您可以在切片运算符中使用负整数.这是使用python CLI解释器的示例:

You can use negative integers with the slicing operator for that. Here's an example using the python CLI interpreter:

>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]

重要的一行是a[-9:]

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