python多任务之协程的使用详解

import timedef test1(): while True:  print("--1--")  time.sleep(0.5)  yield Nonedef test2(): while True:  print("--2--")  time.sleep(0.5)  yield Noneif __name__ == "__main__":  t1 = test1()  t2 = test2()  while True:    next(t1)    next(t2)

from greenlet import greenletimport timedef test1(): while True:  print("---A---")  gr2.switch()  time.sleep(0.5)def test2(): while True:  print("---b---")  gr1.switch()  time.sleep(0.5)gr1 = greenlet(test1)gr2 = greenlet(test2)gr1.switch()

import geventimport timefrom gevent import monkey# 打补丁，不需要改原来的耗时操作，否则是要使用gevent提供的模块monkey.patch_all()def f(n): for i in range(n):  print(gevent.getcurrent(), i)  # 使用gevent提供的耗时模块  # gevent.sleep(0.5)  time.sleep(0.5)g1 = gevent.spawn(f, 5)g2 = gevent.spawn(f, 5)g3 = gevent.spawn(f, 5)# g1.join()# g2.join()# g3.join()# 一次性添加全部的任务gevent.joinall([g1,g2,g3])