python network programming book

Key Summary:Server: Running (while true), listening for a port on a running machine (IP), multi-threaded or multi-process receive client socket requestClient: Unsolicited request, need to know the IP and port of the serverService side:#-*-Coding:utf-8-*-Import timeImport socketImport threadingdef tcplink (sock, addr): Print' Accept new connection from%s:%s ... '% addrSock.send (' welcome! ') WhileTrue:data = SOCK.RECV (1024)Time.sleep (1) if data = =' Exit 'Or not data: BreakSock.send (' Hell

Class1 Regular Expressions#定义Regular expressions are a logical formula for manipulating strings, and through it we can filter out what we need, such as determining whether a string of numbers is a phone number.#原理The string of the regular expression is converted to the Pattern object, then the object is used to process the text and the matching result is obtained, and then the other operations are performed according to the result information.1 #Coding:utf-82 ImportRe3Pattern = Re.compile (r'Hel

:Print('recv[%s]:%s'%(str (CLIENTADDR), recvdata))Else: Print('[%s] client is closed'%str (CLIENTADDR)) Clientsocket.close () G_needdelclientinfolist.append (clientsock ET,CLIENTADDR))exceptException as Result:Pass forNeeddelclientinfoinchNeedDelClientInfoList:g_socketList.remove (needdelclientinfo)if __name__=='__main__': Main ()Client#Coding=utf-8 fromSocketImport*ImportRandomImportTimeserverip= Raw_input ("Please enter the IP of the server:") Connnum= Raw_input ("Pl

-8ImportSockethost="'Port= 51421s=Socket.socket (socket.af_inet, socket. SOCK_STREAM) s.setsockopt (socket. Sol_socket, SOCKET. SO_REUSEADDR,1) S.bind ((host, Port)) S.listen (1)#there's only one waiting to be processed at a timePrint "Server is running on port%d, press Ctrl-c to terminate."%Port while1: Clientsock, Clientaddr=s.accept () clientfile= Clientsock.makefile ('RW', 0) clientfile.write ("Welcome,"+ STR (CLIENTADDR) +"\ n") Clientfile.write ("Please enter a string:") Line=clientfile.re

by step 2 and step 3 are from the end of the passive shutdown and may be merged into a sub-section. [2] (2) Between step 2 and step 3, from the execution of the passive closed end to the execution of the active closed one end of the flow of data is possible, this is called "semi-closed" (half-close). (3) When a UNIX process terminates either voluntarily (calling exit or returning from the main function) or involuntarily (receiving a signal terminating the process), all open descriptors are clos

): Self.socket.connect (self.server_address) def client_close (self): Self.socket.close () def run (SE LF): While True:inp=input ("GT;GT;:"). Strip () if not inp:continue l=inp.split () Cmd=l[0] If Hasattr (self,cmd): Func=getattr (Self,cmd) func (l) def Put (Self,args): CMd=args[0] filename=args[1] if not os.path.isfile (filename): print (' file:%s are NOT exists '%filen AME) return else:filesize=os.path.getsize (filename) head_dic={' cmd ': cmd, ' filename ': OS . Path.basename (fi

The first parameter of the Listen function is the socket type, the function is to establish a listener on the socket handle, as to whether there is a client connection in, it is necessary to accept the function to check, the first parameter of the Accept function is the socket type, With the Listen function is the same socket handle, so the general accept is placed in a thread in a non-stop call, because we do not know when there will be a client connection in.Listen's socket object is likened t

On the server side, socket () returns the socket for listening (listen) and accept, which cannot be used to send and receive data between clients.Accept () accepts a connection request from a client and returns a new socket that differs from the socket () that is returned by the socket () to listen for and accept the connection request from the client, which is done by sending and receiving data on this new socket.Each incoming client, through the Accept function, returns a different client sock

1. Specific connection process I'm not going to say it. See also: http://woodpecker.org.cn/2. Use the server-side and client-side communication examples to illustrate3. On the CodeService side (server.py)1 #-*-coding:utf-8-*-2 ImportSocket3host="127.0.0.1"4port= 99995s =Socket.socket (Socket.af_inet,socket. SOCK_STREAM)6 S.bind ((host,port))7S.listen (1)8 while1:9Conn,addr=s.accept ()Tendata = CONN.RECV (1024) One ifdata = ='Bye': A Break - Else: - PrintData theTosend =

Server-side code:Import Socket,commandshost = ' Port = 1053s = Socket.socket (socket.af_inet,socket.Sock_stream) S.bind ((Host,port)) S.listen (1) while 1:conn,addr = S.accept () while 1:data = CONN.RECV (1024)CC,BB = commands.getstatusoutput (data) If Len (Bb.strip ())! = 0:conn.sendall (BB) Else: Conn.sendall ("Done")Client side:Import Socket,oss = Socket.socket (socket.af_inet,socket. SOCK_STREAM) host = "www.xiaoran.com" Port = 1053s.connect ((host,port)) While 1:cc = Raw_input ("plase input

Tags: imp primary key self-increment make unified add primary key set screen enc Mysql SqlAlchemy Basic Steps 1.SqlAlchemy Basic structure syntax is as follows: Case: From SQLAlchemy import Create_engine,column,string,integer,foreignkey from sqlalchemy.ext.declarative Import Declarative_base from sqlalchemy.orm import sessionmaker,relationship import pymysql engine = Create_engine ("mysql+pymy Sql://chen:[emailprotected]:3306/school ", encoding= ' Utf-8 ', echo=true) #echo屏幕输出信息 S

Label:Knowledge Reference: Baidu Encyclopedia , mr.7Memcached1. Basic cognition Memcached is a high-performance distributed memory object caching system for dynamic Web applications to mitigate database load. It improves the speed of dynamic, database-driven Web sites by caching data and objects in memory to reduce the number of times a database is read. Memcached is based on a hashmap that stores key/value pairs. Its daemon (daemon) is written in C, but the client can write in any language and

received your data! \ n'. Encode ('Utf-8')) - Else:Wuyi #indicates that the client is closed the client_dict[fd].close () - Wu Client_dict.popitem () - #need to cancel the event registered by the client About Epoll.unregister (FD) $ - #iterate through each client in the clients dictionary for the corresponding FD - forIteminchClient_dict.items (): - A

() ... dx0. 104993585404:d elta_w:[-0.0092478 -0.01849561 -0.02774341] Weight before [3,-2,1]delta_w:[-0.0092478 -0.01849561 -0.02774341] weight after [2.9907522 -2.01849561 0.97225659]dx0. 00664805667079:d elta_w:[-0.00198107 -0.00066036 0.00132071] Weight before [0,3,-1]delta_w:[-0.00198107 -0.00066036 0.00132071] weight after [-1.98106867e-03 2.99933964e+00 -9.98679288e-01]dx0. 196791859198:d elta_w:[-0.02875794 -0.01437897 -0.02875794] Weight before [-1.98106867e-03 2.99933964e+0

also the Communication Foundation of the upper application.2. The server in order to respond to multiple requests at the same time, you can select processes, threads, and other methods to process the incoming requests, the general choice thread or the association3. CPython because the Gil guarantees that a nucleus can only run one thread at a time, a multi-process in a sense just opens up multiple threads, and the process overhead is not a good method, that is, asynchronous

connected, Then go to the socket in the listen state to find */return SK? : __inet_lookup_listener (NET, Hashinfo, daddr, Hnum, dif);} Summarize the process: Server side After calling listen, the kernel establishes two queues, the SYN queue, and the accept queue, where the length of the accept queue is specified by the backlog. After the server has called accept, it blocks, waits for an element of the accept queue, and after the client calls connect, it begins to initiate a SYN request and req

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