使用多进程访问网址的实例

#多进程访问6个网址，计算一下一共有多少个字符。用2个子进程来实现。

#encoding=utf-8
from multiprocessing import Process,Queue,Value, Array

import requests


url= ["http://www.sina.com.cn","http://www.sohu.com","http://www.163.com","http://cn.bing.com","http://www.baidu.com","http://www.iciba.com"]

q=Queue()
for i in url:
    q.put(i)

def f(count,q):
    while not q.empty(): #empty判断队列是否为空
        url = q.get()
        r=requests.get(url)
        count.value +=len(r.text)
        print(url,len(r.text))
        #print(r.text)


if __name__ =="__main__":
     num = Value('i', 0) # 创建一个进程间共享的数字类型，默认值为0
     p1 = Process(target = f, args = (num, q))
     p2 = Process(target = f, args = (num, q))
     p1.start()
     p2.start()
     p1.join()
     p2.join()

     print(num.value)