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

Notice that you are making recursive calls to the next_prime function, but not returning the value from it from the calling function.

Replace the lines:

print candidate, "is not prime - divisible by", div
next_prime(candidate)

with

print candidate, "is not prime - divisible by", div
return next_prime(candidate)