Python function returning None after recursion

Question

I can\'t figure out why this python function returns None if it calls itself recursively.

It was part of my solution to a Project Euler problem. I have solved the p

Answer 1

As others have said, this is not really the place for recursion. Here is an example using iteration. I've also defined another function which tests the primality of an integer - I think this makes the code simpler.

def is_prime(n):
    """Return True if n is prime."""
    for i in xrange(2, n//2):
        if n%i == 0:
            return False
    return True

def next_prime(n):
    """Returns the next prime number after n."""
    if n % 2 == 0:
        candidate = n + 1
    else:
        candidate = n + 2
    while not is_prime(candidate):
        candidate += 2
    return candidate

if __name__ == '__main__':
    n = 896576
    print next_prime(n)