python network programming pdf

The example of this paper describes the Python network programming, share to everyone for your reference. Here's how: The service-side code is as follows: From Socketserver import (TCPServer as TCP, Streamrequesthandler as SRH) from time import ctime HOST = ' PORT = 21 567 ADDR = (HOST, PORT) class Myrequesthandle (SRH): def handle (self): p

This article describes the Python network programming to read the Web site root directory method, share to everyone for your reference. The implementation method is as follows: Import socket, sys PORT = * Host = "quux.org" filename = "//" s = socket.socket (socket.af_inet, socket. Sock_stream) S.connect ((host, Port)) S.sendall (filename+ "\ r \ n") while (1)

the recv () function, because the buffer has data, and the recv () function is generally not blocked.(3). This model is less used and belongs to the typical "pull model", where the upper-level application needs to call the recv () function to pull the data in.5. Asynchronous IO ModelThe asynchronous IO Model diagram is as follows:Description(1). The upper-level application calls the Aio_read function and submits an application-tier buffer to the kernel to write data to, and after the call is co

The example of this article tells the Python network programming, share for everyone to reference. The specific methods are as follows: The service-side code is as follows: From Socketserver import (TCPServer as TCP, Streamrequesthandler as SRH) from time import ctime HOST = ' PORT = 21567 ADDR = (HOST, PORT) class Myrequesthandle (

This article describes the Python network programming to read the site root directory method, share for everyone to reference. The implementation methods are as follows: Import socket, sys port = " quux.org" filename = "//" s = socket.socket (socket.af_inet, socket. SOCK_STREAM) S.connect ((host, Port) s.sendall (filename+ "\ r \ n") while (

The content of this article Interface and Normalization design Polymorphism and polymorphism Packaging Object-oriented Advanced Exception handling Network programming First, interface and normalization of design1. Definition(1) Normalization allows the user not to care about the object's class, just to know that these objects have certain functions, which greatly reduces th

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

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

A Python operating network, which is to open a Web site, or request an HTTP interface, using the Urllib module.Urllib module is a standard module, directly import Urllib can, in Python3 inside only urllib module, in Python2 There are urllib module and URLLIB2 module.ImportJSON fromUrllibImportRequest fromUrllibImportParse Pay_url='Http://szz.nnzhp.cn/pay'Balance_url='http://szz.nnzhp.cn/get_balance'Balance_

Sockets are computer network data structures;Originally created for an application on the same host, allowing one process running on the host to communicate with another process;interprocess communication (IPC): file-based and network-oriented;File-based: Af_unix;Network-oriented: Af_inet, AF_INET6;Valid port range: 0~65536; (the port number less than 1024 is res

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

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:

XLWT. The workbook type of Save (filepath) method can save an Excel file.So it's easy to handle reading and generating Excel files, but making changes to an existing Excel file can be tricky. However, there is also a xlutils (dependent on xlrd and XLWT) that provides the ability to copy the contents of an Excel file and modify the file.From XLRD import open_workbookfrom xlutils.copy import Copy RB = Open_workbook (' 1.xls ') #通过sheet_by_index () Gets the sheet without the Write () Method rs = r

' server is running .... ' Server = socketserver.threadingtcpserver (addr, Servers) Server.serve_forever ()　　Second, create SOCKETSERVERTCP clientFrom socket import *host = ' xxx.xxx.xxx.xxx ' port = 9999bufsize = 1024addr = (host,port) client = socket (Af_inet,sock_stream ) Client.connect (addr) while True: data = raw_input () if not data or data== ' exit ': break client.send ('% s\r\n '% data ' data = CLIENT.RECV (bufsize) if not data: break print Data.strip ()