python 协程

2020-12-13 03:24

阅读:349

标签:多个   print   from   打印   key   pytho   返回值   时间   obj   

一、实质

协程的本质是线程

在多个任务之间切换来节省一些IO时间

进程和线程是操作系统调度

协程是代码调度

二、greenlet

from greenlet import greenlet


def eat():
    print(start eat)
    g2.switch()
    print(end eat)
    g2.switch()


def play():
    print(start play)
    g1.switch()
    print(end play)


g1 = greenlet(eat)
g2 = greenlet(play)
g1.switch()
"""
打印:
start eat
start play
end eat
end play
"""

三、gevent

"""
常用方法
from gevent import monkey;monkey.patch_all()
打补丁,用于识别IO
gevent.spawn(方法名, 参数)
创建协程对象
obj.join() 等待协程对象的结果
obj.value() 协程对象的返回值
"""
from gevent import monkey;monkey.patch_all()
import gevent
import time


def eat():
    print(start eat)
    time.sleep(0.5)
    print(end eat)


def play():
    print(start play)
    time.sleep(0.5)
    print(end play)


g1 = gevent.spawn(eat)
g1.join()   # 等待g1执行结束
g2 = gevent.spawn(play)
g2.join()   # 等待g2执行结束
"""
打印:
start eat
start play
end eat
end play
"""

 

python 协程

标签:多个   print   from   打印   key   pytho   返回值   时间   obj   

原文地址:https://www.cnblogs.com/wt7018/p/11074486.html


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