Python Network Programming

@1: 同步网络编程（也就是阻塞方式）

同步网络编程一次只能连接一个客户端。

Server端:

import socket

def debugPrint(name, value):
    print("{0}: {1}".format(name, value))

def server():
    #1:
    server = socket.socket()
    #NOTE: NOT "host = server.gethostname()"
    host = socket.gethostname()
    port = 8080
    #2:
    #NOTE: NOT "server.bind(host, port)" TypeError: bind() takes exactly one argument (2 given)
    server.bind((host, port))
    #3:
    server.listen(3)    #listen()的参数为允许等待的连接数
    while 1:
        #4:
        client, address = server.accept() #accept()会阻塞，直到有客户端连接
        debugPrint("client", client)
        debugPrint("address", address)
        #5:
        client.send("Welcome!")
        client.close()

def main():
    server()

Client端:

import socket
import server

def client():
    #1:
    client = socket.socket()
    host = socket.gethostname()
    port = 8080
    #2:
    client.connect((host, port))
    #3:
    content = client.recv(1024)
    server.debugPrint("From Server", content)

def main():
    client()

@2: 异步网络编程（也就是非阻塞方式）

异步网络编程, 允许多个客户端链接。

异步网络编程有3种实现方法: 分叉（多进程）， 多线程，异步IO

分叉方式占据资源，windows不支持分叉； 多线程方式存在同步问题；