1 from urllib import request 2 import gevent,time 3 from gevent import monkey#该模块让当前程序所有io操作单独标记，进行异步操作。 4 5 monkey.patch_all()#对当前程序的io操作打上补丁。没有该monkey方法，异步IO无效。 6 def f(url): 7 print('GET:%s'%url) 8 resp = request.urlopen(url)#获取网页 9 data = resp.read()#读取网页 10 print('%d bytes received from %s'%(len(data),url))#打印长度 11 url = ['https://www.yahoo.com/','https://www.python.org/', 12 'https://github.com/'] 13 start = time.time() 14 for i in url: 15 f(i)#循环运行列表中的网页 16 print('串行执行时间：',time.time() - start)#串行执行时间 17 async_time = time.time() 18 gevent.joinall([ 19 gevent.spawn(f,'https://www.yahoo.com/')#异步执行启动协程 20 , gevent.spawn(f,'https://www.python.org/'), 21 gevent.spawn(f,'https://github.com/'), 22 ]) 23 print('异步执行时间async time:',time.time() - async_time)#多协程异步IO执行时间
以下为运行结果，明显多协程的牛逼之处。。。。。。。如果不执行monkey方法，则异步IO就会按串行执行。
C:UsershushuningAnaconda3python.exe C:/Users/hushuning/PycharmProjects/untitled/njx/把当前程序的所有的io操作单独标记，进行异步操作.py GET:https://www.yahoo.com/ 510125 bytes received from https://www.yahoo.com/ GET:https://www.python.org/ 48857 bytes received from https://www.python.org/ GET:https://github.com/ 51373 bytes received from https://github.com/ 串行执行时间： 4.710935354232788 GET:https://www.yahoo.com/ GET:https://www.python.org/ GET:https://github.com/ 48857 bytes received from https://www.python.org/ 512422 bytes received from https://www.yahoo.com/ 51373 bytes received from https://github.com/ 异步执行时间async time: 1.6521050930023193 Process finished with exit code 0