prime number generator in python

prime_generator.py

def prime_generator():
    yield 2

    prev = [2]
    potential = 3

    while True:
        while any(map(lambda x: potential % x == 0, prev)):
            potential += 1

        yield potential
        prev.append(potential)

primes = prime_generator()
known_primes = [2, 3, 5, 7, 11, 13, 17, 19, 23]

for n in known_primes:
    assert primes.next() == n, n