you're wrong, they're taking every letter in the alphabet it test it against s, if the letter is not in s, which mean it's not a pangram, which mean it would return False and the code ends there. However, if we iterate through the whole alphabet with every letter in s, the loops finish and it return True.

though it only works IF YOU ARE TESTING A PANGRAM

Literally the point of the Kata, no?

I read somewhere that the return command exits the whole function. This means that the loop wouldn't be repeated since it is no longer running the function where the loop is in.

Edit: fixed some grammar and punctuation errors

If we replace devision'/' to floor division '//', it will work as the floor division gets the integer quotient.