prime sieve

sieve_prime.py

def Generate():
    i = 2
    while True:
        yield  i
        i += 1

def Filter(ig, prime):
    while True:
        i = ig.next()
        if i % prime != 0:
            yield i

if __name__ == "__main__":
    ig = Generate()
    for i in range (0, 20):
        prime = ig.next()
        print prime
        primeg = Filter(ig, prime)
        ig = primeg