35、concurrent.futures模块与协程

#pip3 install threadpool  #需下载
import threadpool
import requests
import re
import os

#爬取网页
def get_page(url) :
    pattern = re.compile(r‘<dd>.*?board-index.*?>(\d+)<.*?title="(.*?)".*?star.*?>(.*?)<.*?releasetime.*?>(.*?)<‘, re.S)
    response = requests.get(url)
    if response.status_code == 200 :  
    #status_code请求的状态码200为正常
        return (response.text,pattern,url)

#信息处理
def parse_page(info) :
    page_content,pattern,url = info
    print(‘<%s> parse [%s]‘% (os.getpid(), url))
    res = re.findall(pattern,page_content)
    dic_l = []
    for item in res:
        dic = {
            ‘index‘:item[0],
            ‘title‘:item[1],
            ‘actor‘:item[2].strip()[3:],
            ‘time‘:item[3][5:]
        }
        dic_l.append(dic)
        print(dic)
    with open(‘movie_info.txt‘,‘a‘,encoding=‘utf-8‘) as f :
        for i in range(len(dic_l)) :
            parse_res = (‘index:%s title:%s actor:%s time:%s\n‘ %(dic_l[i][‘index‘],dic_l[i][‘title‘],dic_l[i][‘actor‘],dic_l[i][‘time‘]))
            f.write(parse_res)

if __name__ == ‘__main__‘:
    urls = [
        ‘http://maoyan.com/board/7‘,
        ‘http://maoyan.com/board/6‘,
        ‘http://maoyan.com/board/1‘,
        ‘http://maoyan.com/board/2‘,
        ‘http://maoyan.com/board/4‘,
    ]
    t = threadpool.ThreadPool(4)  #创建线程池
    for url in urls :
        res = threadpool.makeRequests(get_page,urls,parse_page(get_page(url)))
    #参数：执行函数，参数，回调函数
    [t.putRequest(req) for req in res]
    t.wait()

#顺序执行
import time
def f1():
    res=1
    for i in range(100000000):
        res+=i

def f2():
    res=1
    for i in range(100000000):
        res*=i

start=time.time()
f1()
f2()
stop=time.time()
print(‘run time is %s‘ %(stop-start)) #10.985628366470337

#切换
from greenlet import greenlet
import time
def f1():
    res=1
    for i in range(100000000):
        res+=i
        g2.switch()

def f2():
    res=1
    for i in range(100000000):
        res*=i
        g1.switch()

start=time.time()
g1=greenlet(f1)
g2=greenlet(f2)
g1.switch()
stop=time.time()
print(‘run time is %s‘ %(stop-start)) # 52.763017892837524

import gevent
def eat(name):
    print(‘%s eat 1‘ %name)
    gevent.sleep(2)
    print(‘%s eat 2‘ %name)

def play(name):
    print(‘%s play 1‘ %name)
    gevent.sleep(1)
    print(‘%s play 2‘ %name)


g1=gevent.spawn(eat,‘egon‘)
g2=gevent.spawn(play,name=‘egon‘)
g1.join()
g2.join()
#或者gevent.joinall([g1,g2])
print(‘主‘)

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 spawn,joinall,monkey;monkey.patch_all()

import time
def task(pid):
    """
    Some non-deterministic task
    """
    time.sleep(0.5)
    print(‘Task %s done‘ % pid)


def synchronous():
    for i in range(10):
        task(i)

def asynchronous():
    g_l=[spawn(task,i) for i in range(10)]
    joinall(g_l)

if __name__ == ‘__main__‘:
    print(‘Synchronous:‘)
    synchronous()

    print(‘Asynchronous:‘)
    asynchronous()
#上面程序的重要部分是将task函数封装到Greenlet内部线程的gevent.spawn。 初始化的greenlet列表存放在数组threads中，此数组被传给gevent.joinall 函数，后者阻塞当前流程，并执行所有给定的greenlet。执行流程只会在 所有greenlet执行完后才会继续向下走。

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)

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 gevent import monkey;monkey.patch_all()
import gevent
from socket import *
def talk(conn,addr):
    while True:
        data=conn.recv(1024)
        print(‘%s:%s %s‘ %(addr[0],addr[1],data))
        conn.send(data.upper())
    conn.close()

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

if __name__ == ‘__main__‘:
    server(‘127.0.0.1‘, 8088)

from multiprocessing import Process
from socket import *
def client(server_ip,server_port):
    client=socket(AF_INET,SOCK_STREAM)
    client.connect((server_ip,server_port))
    while True:
        client.send(‘hello‘.encode(‘utf-8‘))
        msg=client.recv(1024)
        print(msg.decode(‘utf-8‘))

if __name__ == ‘__main__‘:
    for i in range(500):
        p=Process(target=client,args=(‘127.0.0.1‘,8088))
        p.start()