如何在python中进行反向切片？

Question

Say I have lst = [1, 2, 3] and I want to access the last two elements in reverse order, as in [3, 2]

How do I do that using slicing?

Answer 1

Simply put bounds into your slice:

>>> [1,2,3][-1:-3:-1]
[3, 2]

In the slice -1:-3:-1 :

• the first element is the position of where we want to start ( -1 );
• the second is where we wish to stop (non-inclusive);
• and the third is the direction (or skip) (backwards).

Answer 2

• [-2::] will return the last two elements
• [::-1] will reverse it

So the answer will be:

lst[-2::][::-1]

I checked @donkopotamus's answer and it is actually the best answer

Answer 3

Get the last two elements!

And then reverse it!

>>> lst
[1, 2, 3]
>>> lst[-2:][::-1]
[3, 2]