通过线程来实现多任务并发。提高性能。先看看例子。
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date : 2020-03-02 21:10:39
# @Author : Flyinghappy (671474@qq.com)
# @Link : https://www.cnblogs.com/flyinghappy/
# @Version : $Id$
import time
import threading
import requests
import urllib.request
def runinfo(func):
def inner(*args):
print('开始访问---'+str(args[0]))
start_time=time.time()
result=func(*args)
stop_time=time.time()
print(func.__name__+'------running time is: %s'% (stop_time-start_time))
print('结束访问---'+str(args[0]))
return result
return inner
@runinfo
def taskfun(url):
html=urllib.request.urlopen(url).read()
return html
@runinfo
def taskfun_outer(num_list):
url=[
'http://www.sina.com.cn',
'http://www.cnr.cn',
'http://www.hao123.com',
'http://www.taobao.com',
'https://www.eastmoney.com'
]
thread_list=[]
for i in range(len(url)):
t=threading.Thread(target=taskfun,args=(url[i],))
thread_list.append(t)
for item in thread_list:
item.start()
for item in thread_list:
item.join() def main():
start_time=time.time()
num_list=['taskfun_outer']
taskfun_outer(num_list)
stop_time=time.time()
print('main---running time is: %s'% (stop_time-start_time))
if __name__ == '__main__':
main()
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。