python network programming pdf

@1: Synchronous network programming (i.e. blocking mode)Synchronous network programming can only connect one client at a time.Server side:ImportSocketdefdebugprint (name, value):Print("{0}: {1}". Format (name, value))defserver ():#1:Server =Socket.socket ()#note:not "host = Server.gethostname ()"Host =socket.gethostnam

The native socket client is blocked when it connects to the server, that is, when the server calls the Accept method, while the server and the client are blocked when the data is received (called recv). The native socket server can only handle one client request at a time, that is, the server cannot communicate with multiple clients simultaneously, and the service side resource is idle (the server only occupies I/O,CPU idle at this time).The demand now is that we have multiple clients connecting

1. Python's network programming(1), server-side code:#!/usr/bin/python#_*_coding:utf-8_*_import socket #导入socket模块, Socket module has socket class SK = Socket.socket () Ip_port = (' 127.0.0.1 ', 9919) sk.bind (Ip_port) Sk.listen (5) while true:conn, address = Sk.accept () conn.send (' hello ') flag = TRue while Flag:data = Conn.recv (1024x768) print data if data

, but a value representing the number of ready descriptors, you only need to obtain the corresponding number of file descriptors in sequence in an array specified by epoll. the memory ing (mmap) technology is also used here, this completely saves the overhead of copying these file descriptors during system calls. Another essential improvement is that epoll uses event-based readiness notification. In select/poll, the kernel scans all monitored file descriptors only after a certain method is cal

the command:#服务端ImportSocketImportSubprocessserver= Socket.socket (socket.af_inet,socket. SOCK_STREAM)#Build ServicesServer.bind (('127.0.0.1', 8080))#listening for IP and portsServer.listen (5)Print('Server Run .....') whiletrue:conn,client_addr=server.accept ()#wait for client connection to establish connection object Conn Print(CLIENT_ADDR)#Print Client connection information whileTrue:Try: Client_msg= CONN.RECV (1024)#receiving client Messagesres = subprocess. Popen (Client_msg.decod

Network programming patents should belong to UNIX, each platform (such as Windows, Linux, etc.), the language (c, C + +, Python, Java, etc.) to achieve the same characteristics of the syntax are similar. In my opinion, understand the UNIX socket network programming, other fo

1, to learn this part, you should first understand the OSI 7 layer model, TCP/IP four layer, socket sockets and other network-related knowledge points. Python network library, URLLIB,URLLIB2, the latter features a bit more powerful. Import Urllib2import urllibresponse = Urllib2.urlopen (' http://www.baidu.com ') #获取百度首页的代码, open the remote file Urllib.urlretrieve

Directly on the code, then explain:#-*-Coding:utf-8-*-# Maybe you don't want to write process-based applications for some reason, rather than write multithreaded applications# As with previous Forkingmixin-based socket servers, socket servers written with ThreadingMixIn are subject to the same ECHO server programming pattern# Threadedservr inherits from TCPServer and ThreadingMixIn, a new thread is created when the client connects to this multithreade

ctimehost = ' PORT = 21567BUFSIZ = 1024ADDR = (host,po RT) Udpsersock = socket (af_inet,sock_dgram) Udpsersock.bind (ADDR) while True: print (' Waiting for message ... ') Data, Addr=udpsersock.recvfrom (bufsiz) udpsersock.sendto (' [%s]%s '% (CTime (), data), addr) print (' ... Received from and returned to: ', addr) udpsersock.close ()6. Create a UDP clientCS = socket () Comm_loop: cs.send ()/cs.recvfrom () Cs.close ()#!/usr/bin/env pytho