python network programming pdf

close the socket so that a complete network communication is over - $ $ #the data received include the HTTP header and the Web page itself, we just need to separate the HTTP header and Web page, the HTTP header print out, the content of the Web page saved to the file -Header, html = data.split (b'\r\n\r\n', 1) - Print(Header.decode ('Utf-8')) the #to write the received data to a file: -With open ('sina.html','WB') as F:Wuyi f.write (HTML) the - ##

(1) simple link with socketthe socket inside Python supports UDP, TCP, and interprocess communication . the socket can encapsulate what we want to send, send the past, and then back to the original appearance, in fact, network communication can understand that Chengdu is built on the socket, the following code is to demonstrate the use of the socket for simple links#要成一次通信, at least two people, that is, a s

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

This paper illustrates the data transmission UDP implementation method of Python network programming. Share to everyone for your reference. The specific analysis is as follows: First, the question: Do you think that tools like msn,qq on the Web transmit data mysteriously between machines? You want to play a little bit, too? Do you pass data between the two mach

) print "Sent:%d characters, so far ..."%sent_data_length # Display Server re Sponse response = SELF.SOCK.RECV (buf_size) print "PID%s Received:%s"% (Current_procESS_ID, Response[5:]) def shutdown (self): "" "Cleanup the Client Socket" "" Self.sock.close () Class Forkingserverrequesthandler (Socketserver.baserequesthandler): def handle (self): # Send the echo back To the client data = SELF.REQUEST.RECV (buf_size) current_process_id = os.getpid () response = '%s:%s '% (current_process_id, data)

This article mainly introduces the python network programming example and provides the client and server. if you need it, refer to the client. The code is as follows: If _ name _ = '_ main __':Import socketImport OSSock = socket. socket (socket. AF_INET, socket. SOCK_STREAM)Sock. connect ("localhost", 8001 ))Import timeTime. sleep (2)Sock. send ('1 ')Print sock

To create a TCP server pseudo-code:s = socket () #创建服务器套接字S.bind () #套接字与地址绑定S.listen () #监听连接Inf_loop: #服务器无限循环cs = s.accept () #接受客户端连接, if there is no connection, blockComm_loop: #通信循环CS.RECV ()/cs.send () #会话Cs.close () #关闭客户端套接字S.close () #关闭服务器套接字Here's the code:#!/usr/bin/envpython3#encoding:utf-8fromsocketimport*fromtime importctimehost= ' port=21567bufsize=1024addr= (HOST, port) Tcpsersock=socket (af_inet,sock_stream) tcpsersock.bind (ADDR) Tcpsersock.listen (5) while true:print (' wait

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