通过线程来实现多任务并发。提高性能。先看看例子。

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # @Date    : 2020-03-02 21:10:39
 4 # @Author  : Flyinghappy (671474@qq.com)
 5 # @Link    : https://www.cnblogs.com/flyinghappy/
 6 # @Version : $Id$
 7 import time
 8 import threading
 9 import requests
10 import urllib.request
11 def runinfo(func):
12     def inner(*args):
13         print('开始访问---'+str(args[0]))
14         start_time=time.time()
15         result=func(*args)
16         stop_time=time.time()
17         print(func.__name__+'------running time is: %s'% (stop_time-start_time))
18         print('结束访问---'+str(args[0]))
19         return result
20     return inner
21 @runinfo
22 def taskfun(url):
23     html=urllib.request.urlopen(url).read()
24     return html
25 @runinfo 
26 def taskfun_outer(num_list):  
27     url=[
28     'http://www.sina.com.cn',
29     'http://www.cnr.cn',
30     'http://www.hao123.com',
31     'http://www.taobao.com',
32     'https://www.eastmoney.com'
33     ]
34     thread_list=[]
35     for i in range(len(url)):
36         t=threading.Thread(target=taskfun,args=(url[i],))
37         thread_list.append(t)
38     for item in thread_list:
39         item.start()
40     for item in thread_list:
41         item.join()
42     
43 def main():
44     start_time=time.time()
45     num_list=['taskfun_outer']
46     taskfun_outer(num_list)
47     stop_time=time.time()
48     print('main---running time is: %s'% (stop_time-start_time))
49 if __name__ == '__main__':
50     main()

View Code

测试结果：从用的时间看访问的任务是并发的，还可以从执行的顺序来看。