求10000以内所有质数的和

# -*- coding: utf-8 -*- def zhishu(num=None):    if num is None or num == 1 or num < 0:        return 0         i = 2    while True:        if i == num:            return num        elif num % i != 0:            i += 1        elif num % i == 0 and num != i:            break             return 0 def sum_zhishu():    sum = 0    for i in range(10001):        sum += zhishu(i)    return sum print sum_zhishu()

参考：http://baike.baidu.com/link?url=TpvFbbDQbNWtalMjZIc1EZC3288x8I6ki2pyz5UJFtIHx2alz0AfMwWbG-IrnG5qDnbrlS3tBs7t4VinnJomIq