Slicing a list

Question

Say I have
Red = [1,2,3,4,5]

How do I slice backward and foward leaving out 3?
So that:

Backward:
Red_1 = [1,2]

Foward:
Red_2 = [4,5]

Answer 1

Jay Matthews is there are way (a) can be = 2 because I am writing binaru search algorithm

Answer 2

Not the most efficient way but thanks

Answer 3

Your binary search is very efficient. but I did it like this:
https://code.sololearn.com/clyjkVX33NK8/?ref=app