使用多进程请求多个url来减少网络等待浪费的时间

code

from multiprocessing import Pool
import requests
import json
import os
 
def get_page(url):
    print('<进程%s> get %s' %(os.getpid(),url))
    respone=requests.get(url)
    if respone.status_code == 200:
        return {'url':url,'text':respone.text}
 
def pasrse_page(res):
    print('<进程%s> parse %s' %(os.getpid(),res['url']))
    parse_res='url:<%s> size:[%s]\n' %(res['url'],len(res['text']))
    with open('db.txt','a') as f:
        f.write(parse_res)
 
if __name__ == '__main__':
    urls=[
        'https://www.baidu.com',
        'https://www.python.org',
        'https://www.openstack.org',
        'https://help.github.com/',
        'http://www.sina.com.cn/'
    ]
 
    p=Pool(3)
    res_l=[]
    for url in urls:
        res=p.apply_async(get_page,args=(url,),callback=pasrse_page)
        res_l.append(res)
 
    p.close()
    p.join()
    #print([res.get() for res in res_l]) #拿到的是get_page的结果,其实完全没必要拿该结果,该结果已经传给回调函数处理了

Outputs

macname@MacdeMacBook-Pro py % python3 cccccc.py
<进程61068> get https://www.baidu.com
<进程61069> get https://www.python.org
<进程61070> get https://www.openstack.org
<进程61068> get https://help.github.com/
<进程61067> parse https://www.baidu.com
<进程61069> get http://www.sina.com.cn/
<进程61067> parse https://www.python.org
<进程61067> parse http://www.sina.com.cn/
<进程61067> parse https://help.github.com/
<进程61067> parse https://www.openstack.org
macname@MacdeMacBook-Pro py %