I didn't know until now that you can directly join stuff to a string without introducing a variable. you learn something every day ig.

Best practice for pythonist.

Correct– .sort() works inplace. While that reduces memory overhead, that is bad practice for most functions because of Python's implicit pass-by-assignment mechanic. The function would have the side-effect of sorting the original list, which might or might not cause a very difficult to find bug later.

AFAIK .sort() is method for lists and it doesnt return anything.

nice solution