python并发编程：多线程-开启线程的两种方式

Posted 2020-12-02 芳姐

一 threading模块介绍

multiprocess模块完全模仿了threading模块的接口，二者在使用层面，有很大的相似性

二 开启线程的两种方式

方式一

from threading import Thread
import time


def sayhi(name):
    time.sleep(2)
    print("%s say hello" % name)


if __name__ == ‘__main__‘:
    t = Thread(target=sayhi, args=(‘mike‘, ))
    t.start()
    print("主线程")

　　方式二

from threading import Thread
import time


class Sayhi(Thread):
    def __init__(self, name):
        super().__init__()
        self.name = name

    def run(self):
        time.sleep(2)
        print(‘%s say hello‘ % self.name)


if __name__ == ‘__main__‘:
    t = Sayhi(‘mike‘)
    t.start()
    print("主线程")

　　

三 练习题

1、基于多线程实现并发的套接字通信

客户端：

from socket import *
ip = ‘127.0.0.1‘
port = 8081

c = socket(AF_INET, SOCK_STREAM)
c.connect((ip, port))

while True:
    msg = input("请输入客户端的信息").strip()
    if not msg:
        continue

    c.send(msg.encode(‘utf-8‘))
    data = c.recv(1024)
    print("收到的信息:", data.decode(‘utf-8‘))

　　

服务端：

from socket import *
from threading import Thread


def talk(conn):
    while True:
        try:
            data = conn.recv(1204)
            if not data:
                break
            conn.send(data.upper())
        except ConnectionResetError:
            break
    conn.close()


def server(ip, port):

    server_socket = socket(AF_INET, SOCK_STREAM)

    server_socket.bind((ip, port))
    server_socket.listen(1)

    while True:
        conn, addr = server_socket.accept()
        p = Thread(target=talk, args=(conn,))
        p.start()
    conn.close()


if __name__ == ‘__main__‘:
    server(‘127.0.0.1‘, 8081)