Primality test in python [duplicate]

Answer 1

In brief, your isprime(x) checks whether the number is odd, exiting right after if x % 2 == 0.

Try a small change so that you would actually iterate:

def isprime(x):
    for i in range(2, x-1):
        if x % i == 0:
            return False
    else:
        return True

Note that else: is now part of the for loop rather than if statement.