greenlet实现协程

#greenlet
 1 import time

 from greenlet import greenlet

 # greenlet可以实现一个自行调度的微线程

 def work1():

     while True:

         print("正在执行work1（）")

         time.sleep(0.5)#模拟阻塞

         # 如果遇到阻塞的情况下，切换到第二个任务

         g2.switch()

 def work2():

     while True:

         print("正在执行work2（）")

         time.sleep(0.5)

         # 切换到第一个任务

         g1.switch()

 if __name__ == '__main__':

     # 创建greenlet的对象    greenlet（函数名）

     g1 = greenlet(work1)

     g2 = greenlet(work2)

     g1.switch()