python 实现协程 提高效率

#1 yiled可以保存状态（生成器），yield的状态保存与操作系统的保存线程状态很像，但是yield是代码级别控制的，更轻量级
#2 send可以把一个函数的结果传给另外一个函数，以此实现单线程内程序之间的切换 

    一旦引入协程，就需要检测单线程下所有的IO行为,
    实现遇到IO就切换,少一个都不行，以为一旦一个任务阻塞了，整个线程就阻塞了，
    其他的任务即便是可以计算，但是也无法运行了

#串行执行
import time

def func1():
    for i in range(10000000):
        i+1

def func2():
    for i in range(10000000):
        i+1

start = time.time()
func1()
func2()
stop = time.time()
# 输出在没有进行切换的情况下的计算型的进程所需要的运行时间
print(stop - start)         


#基于yield并发执行（使用生成器进行模拟协程的程序的切换）
import time
def func1():
    while True:
        yield

def func2():
    g=func1()
    for i in range(10000000):
        i+1
        next(g)


start=time.time()
func2()
stop=time.time()
print(stop-start)

import time
def func1():
    while True:
        print('func1')
        yield

def func2():
    g=func1()
    for i in range(10000000):
        i+1
        next(g)
        time.sleep(3)
        print('func2')
start=time.time()
func2()
stop=time.time()
print(stop-start)

from gevent import monkey;monkey.patch_all()

import gevent
import time
def eat():
    print('eat food 1')
    time.sleep(2)
    print('eat food 2')

def play():
    print('play 1')
    time.sleep(1)
    print('play 2')

g1=gevent.spawn(eat)
g2=gevent.spawn(play_phone)
gevent.joinall([g1,g2])
print('主')

from gevent import monkey;monkey.patch_all()
import gevent
import requests
import time

def get_page(url):
    print('GET: %s' %url)
    # 因为发起请求都是在等待服务器的回应
    response=requests.get(url)
    if response.status_code == 200:
        print('%d bytes received from %s' %(len(response.text),url))


start_time=time.time()
gevent.joinall([
    gevent.spawn(get_page,'https://www.python.org/'),
    gevent.spawn(get_page,'https://www.yahoo.com/'),
    gevent.spawn(get_page,'https://github.com/'),
])
stop_time=time.time()
print('run time is %s' %(stop_time-start_time))

from gevent import monkey;monkey.patch_all()
from socket import *
import gevent

#如果不想用money.patch_all()打补丁,可以用gevent自带的socket
# from gevent import socket
# s=socket.socket()

def server(server_ip,port):
    s=socket(AF_INET,SOCK_STREAM)
    s.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
    s.bind((server_ip,port))
    s.listen(5)
    while True:
        conn,addr=s.accept()
        gevent.spawn(talk,conn,addr)

def talk(conn,addr):
    try:
        while True:
            res=conn.recv(1024)
            print('client %s:%s msg: %s' %(addr[0],addr[1],res))
            conn.send(res.upper())
    except Exception as e:
        print(e)
    finally:
        conn.close()

if __name__ == '__main__':
    server('127.0.0.1',8080)

#_*_coding:utf-8_*_

from socket import *

client=socket(AF_INET,SOCK_STREAM)
client.connect(('127.0.0.1',8080))


while True:
    msg=input('>>: ').strip()
    if not msg:continue

    client.send(msg.encode('utf-8'))
    msg=client.recv(1024)
    print(msg.decode('utf-8'))

from threading import Thread
from socket import *
import threading

def client(server_ip,port):
    c=socket(AF_INET,SOCK_STREAM) #套接字对象一定要加到函数内，即局部名称空间内，放在函数外则被所有线程共享，则大家公用一个套接字对象，那么客户端端口永远一样了
    c.connect((server_ip,port))

    count=0
    while True:
        c.send(('%s say hello %s' %(threading.current_thread().getName(),count)).encode('utf-8'))
        msg=c.recv(1024)
        print(msg.decode('utf-8'))
        count+=1
if __name__ == '__main__':
    for i in range(500):
        t=Thread(target=client,args=('127.0.0.1',8080))
        t.start()