Python slicing with wrapping from negative to positive numbers

Question

Say I have a string "abcde", and want to get "deab". How can I get "deab" using string slicing?

I've tried using string[-2:1] , but this gives me an empty result '' .

The project I am working on makes splitting this up into [-2:] and [:2] difficult, hence the question. Thanks!

Answer 1

You can simulate wrapping by doubling the string:

(string * 2)[3:7]

This is not necessarily much less efficient than getting two slices the usual way: it only creates one temporary string instead of two, but obviously requires quite a bit more space.

Answer 2

你可能想要这个，

s[-2:] + s[:2]