python network programming pdf

socket starts listening, it can accept the client connection. This step is completed using the accept method. This method will be blocked until the client connects, and then the method will return a tuples in the format of (client, address). client is a client socket, and address is the listening address. The socket has two methods: send and recv (used for receiving) for data transmission. You can use string parameters to call send to send data, and use a required maximum number of bytes as the

a tuple (ipaddr,port)Sk.fileno ()file descriptor for socketsSecond, get some address and host nameThe socket module provides several functions for working with host names and addresses.Socket.gethostname ()GetHostName () returns the host name of the computer on which the program is runningSocket.gethostbyname (' www.jb51.net ')gethostbyname (name) attempts to interpret the given host name as an IP address.GETHOSTBYNAME_EX (name)It returns a tuple of three elements, namely a list of the primary

Python network programming 08 ---- Django form, python08 ---- djangoI. retrieving data from the Request object we have already introduced the HttpRequest object when talking about the View function, but we didn't talk much about it at the time. Let us recall that the first parameter of each view function is an HttpRequest object, just like the following hello ()

This article mainly introduces the annotation problem when using rpclib for Python network programming. The author tells me that he needs to pay attention to unicode annotations when writing servers, for more information, see rpclib, which is a very useful python webservice library and can dynamically generate wsdl. Ho

objects, once a handle has changed +R_list,w_list,e_list = Select.select (inputs,outputs,inputs,1) - Print(' Listening socket object%d '% len (inputs)) + Print(r_list) AFor Sk1_or_conn in R_list: at#每一个连接对象 - ifSk1_or_conn = = Sk1: -#表示有新用户来连接 -Conn, address = Sk1_or_conn.accept () -Inputs.append (conn) - Else: in#有老用户发消息了 -Try toData_bytes = SK1_OR_CONN.RECV (1024) +Except Exception as ex: -#如果用户中断连接 theInputs.remove (Sk1_or_conn) * Else: $#用户正常发消息Panax Noto

= ' Link encap:ethernet HWaddr 00:0c:29:ef:84:a3 inet addr:192.168.31.140 bcast:192 .168.31.255 mask:255.255.255.0 Inet6 addr:fe80::20c:29ff:feef:84a3/64 scope:link up broadcast RUNNING Multicast mtu:1500 metric:1 RX packets:236844 errors:0 dropped:0 overruns:0 frame:0 TX packets:233949 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1076587 102.6 MiB TX bytes:41874253 (39.9 mib) "header = Pkgbuildheader (len)) sendData1 = Header.pack_h Eader + Body.encode

, target, name ="tedu", args = (), Kwargs ={}): Super ().__init__()#Reload the __init__ initialization method of the parent classSelf.target =Target Self.name=name Self.args=args Self.kwargs=KwargsdefRun (self):#call the Run method automatically when you create an object#The thread function to be executed in the call to run Si Cho is to receive a universal pass in the form of a tuple and a dictionarySelf.target (*self.args, * *Self.kwargs)#Thread Functionsdefplayer (song,sec): forIinchRange (2):

compatible with python3x): https://www.djangoproject.com/download/2.Django after download for the compressed package, unzip and python in the same root directory, under Cmd into the Django-1.7.2 (reader may version of the different) directory, execute Python setup.py install, and then start the installation, Django will be installed into Python's lib under Site-packages.StartUse the following command in CM

Using socket programming can be divided into TCP-based and based on UDP,TCP and UDP The main difference is whether there is a connection-oriented.TCP -based socket process:UDP -based socket flowchart:(The above two figures are from the network)You can see that UDP-based sockets are much simpler, UDP clients do not need to connect in advance, and UDP servers do not need listen and accept.The following is a s

Python network programming--io multiplexing EPOLL1, kernel Epoll model explainedThis section refers to the http://blog.csdn.net/mango_song/article/details/42643971 blog and organizesFirst, we define the concept of flow, a stream can be a file, socket,pipe, and so on can do I/O operations of kernel objects. Whether it's a file, a socket (socket), or a pipe, we can

Python 3.x Study Notes 13 (Network Programming socket), pythonsocket 1. ProtocolHttp, smtp, dns, ftp, ssh, snmp, icmp, dhcp... 2. Layer 7 OSIApplication, representation, session, transmission, network, data link, physical 3. socket: Encapsulation of all upper-layer protocols 4. Common socket Functions1) sk. bind (addre

) - - #Activate the server; this would keep running until you - #Interrupt The program with CTRL-C -Server.serve_forever () Client Side 1 ImportSocket2 ImportSYS3 4HOST, PORT ="localhost", 99995data =" ". Join (Sys.argv[1:])6 7 #Create a socket (sock_stream means a TCP socket)8Sock =Socket.socket (socket.af_inet, socket. SOCK_STREAM)9 Ten Try: One #Connect to server and send data A Sock.connect ((HOST, PORT)) -Sock.sendall (bytes (data +"\ n","Utf-8")) - the

Basic Analog Call Network program:1 #Client2 ImportSocket3 4Client =Socket.socket ()5Client.connect (('localhost', 6969))6Client.send (b"Hello ni hao")#only byte codes can be transferred in Python37data = CLIENT.RECV (1024)#1024 Specify the accepted data size to assign the accepted data to the value to data8 Print("recv:", data)9Client.close ()1 ImportSocket2 3 #Service Side4Server =Socket.socket ()5Server.bind (('localhost', 6969))#bind to listen por

(). Decode ("UTF-8")). Encode ("UTF-8")) Tcpserv = Server (ADDR, Myrequesthandler) #变动位置print (' Wait for a new connection .... ') Tcpserv.serve_forever ()MultithreadingSocketserverServer:From Socketserver import (TCPServer as TCP, Streamrequesthandler as srh,threadingmixin as TMI) #变动位置from time import C Time HOST = ' Port = 1234ADDR = (HOST, Port) class Server (TMI, TCP): #变动位置 passclass myreq

Recently gnawing at "Python Core programming (third edition)", it feels that this book is not particularly friendly, although there is an improved code based on Python3, but the whole book of the benchmark feeling is still python2.7. So there are still more errors in Python3 's code, such as the second chapter of network programming:Original code:Create a TCP ser

. To address these numbers conveniently, these numbers are referred to as ports. (This port is a logical port) C: Transport protocol : rules for communication. For example: TCP, UDP protocol (like two people have to communicate in the same language) ①, udp:user Datagram Protocol User Datagram Protocol Features: For no connection: the source and destination ports do not need to be connected before transmitting data, each datagram size is limited to 64K (8 bytes), and the unreliable protocol

Socket network programming for python O M development 04Note:This article comes fromFrom Beijing Old Boy linux O M training center-O M development course free video content, The content of this article is a series of content, for more information can be seen: http://oldboy.blog.51cto.com/2561410/1120636 1) Video practices (better full-screen viewing) For m

..Html1. Basic cognitionHTML(Hypertext Markup Language) Hypertext Markup Language, an application under the standard Universal Markup Language. "Hypertext" means that the page can contain pictures, links, or even music, programs and other non-text elements. The structure of Hypertext Markup Language includes the header section (English: Head), and the "Subject" section (English: Body), where the "Head" section provides information about the Web page, and the "subject" part provides the specific

will be different too. Also note that the last stream we receive is 1767, the next call to Recv () we will receive a 0-length string, which tells us that the server has called close () to close the socket on its end, and no more data will be sent.We can cancel the Time.sleep () comment and slow down the time interval of our successive calls to Recv (). In this way, we wait for a quarter of a second before each call, so that the server catches up with us sending more data before calling Recv ().

= "localhost"Port = 10000S = socket. socket (socket. AF_INET, socket. SOCK_STREAM)S. connect (host, port ))S. send ("hello from client ")S. close () 3. Use the socketserver framework to write TCP servers The Socketserver module simplifies the compilation of network servers. It contains four types of servers. TCPServer uses the TCP protocol, UDPServer uses the UDP protocol, and there are two uncommon ones, UnixStreamServer and unixw.ramserver, these