learning python network programming

Service side:1 fromSocketImport*2 3Server =socket (af_inet, SOCK_DGRAM)4Server.bind (('127.0.0.1', 8080))5 6Res1 = Server.recvfrom (1024)7 Print('First time:', Res1)8 9Res2 = Server.recvfrom (1024)Ten Print('First time:', Res2) One AServer.close ()Client:1 fromSocketImport*2 3Client =socket (af_inet, SOCK_DGRAM)4 5Client.sendto (b'Hello', ('127.0.0.1', 8080))6Client.sendto (b' World', ('127.0.0.1', 8080))7 8Client.close ()Run the server first, run the client, and there is no sticky packet phe

the #Handling Connection Socket Exceptions the Try: the S.connect ((host, port)) + exceptSocket.gaierror as E: - Print("address-related Error connecting to server:%s"%e) theSys.exit (1)Bayi #third Try-except block--Sending data the #Handling Send data errors the Try: - #get method sent to Web site -data ="GET%s http/1.0\r\n\r\n"%filename the S.sendall (Data.encode ()) the exceptSocket.error as E: the Print("Error sending data:%s"%e) theSys.exi

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

connection with the client to the corresponding breakclient.close () #. The problem point of simple FTP making Json.decoder.JSONDecodeError:Extra Data:JSON cannot be decode because there is binary data in the process of transmission.How do I return the transfer file when it is completed?The client will receive a round. And in the transfer list, the first item is the flag, the second item is true, when the two items do not match, the prompt is incorrect, and the list of options is

= (host,port) # Create a client socket Tcpclisock=socket (af_inet,sock_stream) #尝试连接服务器tcpCliSock. Connect (ADDR) #与服务器对话while True: data=input (' > ') If not data: #用户没有输入时退出 break tcpclisock.send (data) Data=tcpclisock.rec (bufsiz) if not data:# The server exits when it fails to accept failure for some reason, exit break Print (data) tcpclisock.close () non- connected sockets This means that there is no need to connect to communicate, but the order a

-only, write-only, read and write.The cache mode is primarily used for disk files, but for interactive network programs It may hinder the operation of the program, so it is best to close it by setting it to zero.2. Basic server OperationsImport socketHost = ' 'Port = 51423s = Socket.socket (socket.af_inet,socket. SOCK_STREAM)S.setsockopt (socket. Sol_socket,socket. so_reuseaddr,1)S.bind ((Host,port))S.listen (1)Print "Server is running on port%d; Pres

(). 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

TCP/IP learning Note two: NIO's network programming buffer simple to use tags (space delimited): Network programming NIO Buffer There are three types of NIO models: Bytebuffer (position/limit/capacity)/Channel/selector channel SelectorThe first two simple examples are intro

Tags: sock network knowledge refueling process-Linu seventh chapter communicationThe book was read ahead of time, focusing on the fourth and sixth chapters, after the seventh chapter is only a general glance, if later work involved in this piece and then carefully study, probably spent 20 days, the main understanding of the process of communication, socket programming and five I/O mode, See the process just

2017-07-24 20:43:49The socket is also called a socket, and the application usually makes a request to the network through a "socket" or answers a network request. The main operational flow of the HTTP protocol is request-response, which is the request response. We can use the socket library in Python to build the connection, and then use the Get method to get the

(ARGS.P)This code, through the command line parameters choose to execute the client or the server, the program. -P to set the port numberPromiscuous CLIENTA client may receive and record all packets it receives, and it does not consider whether the packet is from the correct address, as such clients call the promiscuous client.Such a client can be used to monitor the network, but he may also have problems causing the client to receive spurious packet

, card, card+ ' Name_base ')) Struct_time = Time.localtime () # Recurring Bill list for monthly arrears. and write to the current month's bill for item in basic_info[' debt ': interest = item[' total_debt '] * 0.0005 if Basic_inf O[4] >= interest:basic_info[4] = interest Else:temp = Interest-basic_info [4] basic_info[4]=0 basic_info[0]-= temp Pickle.dump ( Basic_info, open (Os.path.join (settings. All_users, card, card+ ' Name_base ') (' W ')) # if current equals 10th (bef

difference between routers and switches? What is domain name resolution? How to modify the local hosts file? What are the application scenarios and advantages of producer consumer models? What is a CDN? What is LVS and what is the role? What is the role of Nginx? What is the role of keepalived? What is the role of Haproxy? What is load balancing? What is RPC and application scenarios? The function and application of the Asynio module are briefly described . The function and application of the

')). Encode (' Utf-8 ')) #可能存在粘包 # send_res = Conn.send (Cmd_res.encode (' Utf-8 ')) #的可能 #print (send_r ES) conn.send (str (cmd_res.encode (' Utf-8 '))). Encode (' Utf-8 ')) #time. Sleep (0.5) Client_ack = CONN.R ECV (1024x768) # Wait client to confirm print (' Ack from client: ', Client_ack.decode ()) # sticky packet processing send_res = conn. Send (Cmd_res.encode (' Utf-8')) Server.close () Client#！ /usr/bin/env python# _*_ Coding utf-8 _*_#autho

1. Socket programmingSocket types include:--TCP socket and UDP socket. The General Customer service Area mode. --raw socket Can be used for sniffing and injecting 2. C/S modec/S (client/server, client/server) mode, also known as C/s structure, is a model that grew up in the the late 1980s and is a kind of software system architecture. The key of C/s structure lies in the distribution of functions, some functions are performed on the front end machine (i.e. client), an

transfer. Starttransfer_time receives the time Pycurl of the first byte. Total_time the total time of the last request Pycurl. Redirect_time If there is a turn, the time spent is pycurl. Effective_urlpycurl.http_code HTTP Response Code Pycurl. Redirect_count the number of redirects pycurl. Size_upload the size of the uploaded data Pycurl. Size_download the downloaded data size pycurl. Speed_upload upload speed Pycurl. Header_size head size Pycurl. Request_size Request Size Pycurl. Content_lengt

Add a multi-process solution to the service side1. Server-side code is as follows:#!/usr/bin/python#!coding:utf-8ImportOs,sys,time fromSocketImport*defhandleclient (conn):Print '[INFO] handleclient is: {0}'. Format (Os.getpid ()) whileTrue:data= CONN.RECV (1024) if notData:Print '[INFO] handleclient client is stoped .'; Break Print '[INFO] handleclient recive This----{0}'. Format (Data.encode ()) Reply='[INFO] handleclient the informati

conn.commit () cursor.close () Conn.close ()B. Stored Procedures with parametersImport Pymysql conn = Pymysql.connect (host= ' 127.0.0.1 ', port=3306, user= ' root ', passwd= ', db= ' tkq1 ') cursor = Conn.cursor (cursor=pymysql.cursors.dictcursor) cursor.callproc (' P1 ', args= (1, 3, 4)) #获取执行完存储的参数, Parameter @ begins with Cursor.execute ("Select @p1, @_p1_1,@_p1_2,@_p1_3") #{u ' @_p1_1 ': $, U ' @p1 ': None, U ' @_p1_2 ': 103, U ' @_p1_3 ': 24}row_1 = Cursor.fetchone () print row_1conn.com

Python network programming-TCP and UDP socket usage example, pythonudp This article describes the use of TCP and UDP socket in Python network programming. We will share this with you for your reference. The details are as follows: