LMAO!!!

python programmers trying their absolute hardest to write all their code in 1 line

I was wondering how I could get this type of solution all on one line. Great code and very readable

@cahyareza

if x < len(s) - 1
is the same as:
if len(s) - x > 1
meaning that the cursor (x) has to be before (<) the last position (len(s) - 1), in other words at the penultimate position at most, and in this case you want a slice of 2 (s[x:x+2]);
otherwise, if your cursor is at the last position, you want the last character plus an underscore (s[-1] + "_").
You are safe since you're stepping 2 by 2 (in range(0, len(s), >>2<<)).

Also remember that positions start with 0, so each one is "position - 1" (the first one is "1 - 1 = 0", the second one is "2 - 1 = 1", ..., hence the last one is len(s) - 1).

I actually love this one as it fits better in a functional programming mindset.

ok, thanks

When you post here a solution like you did and don't use spoiler flag, your post is visible on the homepage for anyone to see.

what the fuction?

Please use spoiler flag next time.

wow! this hurt my feelings, i cannot begin to comprehend whats going on. Nice Job!