Lists

    # Calculate all the primes below 1000
    # (Not the best way to do it, but...)

    result = []
    candidates = range(3,1000)
    base = 2
    product = base

    while candidates:
        while product < 1000:
            if product in candidates:
                candidates.remove(product)
            product = product+base
        result.append(base)
        base = candidates[0]
        product = base
        del candidates[0]

    result.append(base)
    print result