very nice!

while it is good solution with O(n) complexity, we do not need to import defaultdict, use {} instead --> count = {}

Hey it could be worst, i know how to use it and still used it wrong .-.

Just as I clicked submit, I envivisioned (as I usually do) what the one line solution would look like and just as I thought of abs(), here it is. Dammit.

Poor guy, lol

I mean runtime because of an additional function call.

What do you mean by expensive? As in it takes a lot of system resources compared to over operations?

I am not sure where Codewars rules say thay you need to be as fast as possible :)

i mean, codewars is sbout doing it as fast as possible, even if its extremely ugly

-0 == 0 == +0, try it in the interpreter

Nice!

Just stop.

It's rather a function that can be called on a list to return it's length. But it is not exclusive to lists, can be used on many different types of objects.