I've used maybe a bit stone-age way to solve this, but here is my code.
if x<2: return False if x==2: return True if x%2==1: return True return False
the problem is that for 9 it says:
Oops, try again. Your function fails on is_prime(9). It returns True when it should return False.
9 is prime, so what can be the problem?
Thanks in advance for any help