Python 3 examples and Explanations: Generator Function

 Generator pattern are incredibly important and useful pattern  in python. It actually creates an iterator.

 Reference code is:

#this is a general function

def isprime(n);

            if n == 1:

                        return False

            for x in range(2,n):

                        if n % x == 0;

                                    return False

            else:

                        return True

# this is a generator function

def primes(n = 1):

            while(True):

                        if isprime(n): yield n

                        n += 1