协程

gevent方法实现多任务(协程)

from gevent import monkey
import gevent
import random
import time

# 有耗时操作时需要
# 将程序中用到的耗时操作的代码，换为gevent中自己实现的模块
monkey.patch_all()

def coroutine_work(coroutine_name):
    for i in range(10):
        print(coroutine_name, i)
        time.sleep(random.random())
        #写了monkey.patch_all()就可以用time.sleep，不写就需要gevent.sleep
        # gevent.sleep(1)

#执行创建的协程
gevent.joinall([
        gevent.spawn(coroutine_work, "work1"),
        gevent.spawn(coroutine_work, "work2")
])

了解yield和grenlet

yield方法创建协程

from time import sleep
def task1():
    while True:
        print('---1---')
        sleep(1)
        yield
def task2():
    while True:
        print('---2---')
        sleep(1)
        yield
def main():
    t1 = task1()
    t2 = task2()
    #循环拿到task1和task2的值
    while True:
        next(t1)
        next(t2)
if __name__ == "__main__":
    main()

greenlet方法创建协程

from greenlet import greenlet
import time
def test1():
    while True:
        print("---A---")
        #切换执行gr2
        gr2.switch()
        time.sleep(0.5)
def test2():
    while True:
        print("---B---")
        #切换执行gr1
        gr1.switch(0.5)

gr1 = greenlet(test1)
gr2 = greenlet(test2)
#先执行gr1
gr1.switch()