prime 求质数的和

PYTHON 求给定范围内质数和 代码。 def get_primes(n): numbers = set(range(n, 1, -1)) primes = [] while numbers: p = numbers.pop() primes.append(p) numbers.difference_update(set(range(p*2, n+1, p))) return primes primes=get_primes(20000000) print sum(primes)