python gevnt实现协程

gevent

也是第三方库，自行调度协程，自动试别程序的耗时操作。比如读文件，等待时间。

代码举了个栗子

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from gevent import monkey monkey.patch_all() import time import gevent   def work1():     while True:         print("executing work1......" , gevent.getcurrent())         time.sleep(0.5)   def work2():     while True:         print("executing work2......")         time.sleep(0.5)   if __name__ == '__main__':       #指派任务，gevent.spawn(函数名，参数1，参数2，......)     g1 = gevent.spawn(work1)     g2 = gevent.spawn(work2)      #join是让主程序等待协程执行完再退出      g1.join()     g2.join()<br><br>

 

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结果 executing work1...... <Greenlet at 0x31d1900: work1> executing work2...... executing work1...... <Greenlet at 0x31d1900: work1> executing work2...... executing work1...... <Greenlet at 0x31d1900: work1> .......

 

特别说明

如果没有加下面两行代码，默认情况下就不能识别time.sleep(0.5)耗时操作， 这时可以用gevent.time(0.5)来代替

from gevent import monkey
monkey.patch_all()

 

打补丁

在不修改程序代码的情况下，为程序增加新的功能，