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()

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()