because the "list" function works with strings, but not with numbers

I think because the join() function requires it to be a string.

i agree with that

last lines should be:
s = int(s)
return s

I like that imperative-style coding)

best practice lol axaxa

very readable! people should do it more

It looks like a step-by-step recipe for cooking a dish. I like it!

This is good for readability. Easy to understand for beginners!

I love readable!

you could do this but it would be very unreadable

Its accept negative number.