Suggestions are supposed to be suggestions to improve the kata, not hints for other people for how to solve them.

Conversion, Conversion, Cconversion! This is your best friend here. Try not to overthink it or dilute your code.

Maybe instead of "If n < 0 or m < 0 return 0", you replace it with " If n < 0 and or m < 0 return 0"

this is so real man

pseudocode != kata suggestion

assuming you forgot the parentheses around (a + b), your formula would be correct with floating-point numbers. but since you're dealing with integers, n / 2 truncates, which means you lose 0.5 when a and b have the same parity.

Too bad, a recursive solution won't work.

Yes, now they are actually reverse.

They are not exactly reverse. For example, m=-1 and n=1 fits both.

The instructions are simple and clear - it's the example cases that are horrible.

I'm coming from JavaScript and I keep forgetting their is a sum function. Well, I got the right solution but it wasn't elegant. Hopefully, I'll write better code without having to do 100 more Python katas

Actually, I just found a mathematical formula for converting hours, minutes, and seconds on the internet and solved the problem in 1 minute. Thanks for the hint )