python socket programming

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

This article mainly introduces the example of UDP port multiplexing in the Python Socket programming process. The author used the Python twisted asynchronous framework. If you need it, refer About Port multiplexing A socket cannot bind multiple ports at the same time. If th

Because the project requires a lot of data, even though databases released by some research centers on the Internet are charged, it is a luxury for me to have three employees. (A human face recognition database requires 1000 million USD! WTF !) Try to develop a search tool by yourself... First test a small socket function (very small, the experts will pass ...) [Python] # testint of sending infomation to

, general recommendation 1024An example of a simple server sideImport sockets = Socket.socket () host = Socket.gethostname () #获取本机port = 2233s.bind ((host, Port)) S.listen (5) #调用listen The () method starts listening on the port, and the incoming parameter specifies the maximum number of pending connections: print ' Waiting for connection ... ' while True: #服务器通过循环来接受连接, accept () waits for and returns a client connection. Type is tuple:c,addr = s.accept () print ' Get connection from%s:%s '% a

= 80TenREMOTE_IP =Socket.gethostbyname (host) One #get the IP address of the host, gethostbyname is the IP address of the Web page you do not know, you can obtain a URL, generally on their own computer is not used A Printremote_ip - S.connect ((remote_ip,port)) -Message ='get/http/1.1\r\n\r\n' the #This is a command for HTTP request Web page content - s.sendall (message) - Print 'Message Send successfully' -Reply = S.recv (4096) + Printreply -S.close ()Server and client are a

This article only cares about Python's network programming and focuses on TCP/IP units.First, a simple understanding of the following:1, what is TCP/IP,UDP?TCP/IP (transmission Control protocol/internet Protocol) is a protocol/inter-network protocol, an industry-standard set of protocols designed for wide area networks (WANs).UDP (user Data Protocol, Subscriber Datagram Protocol) is the protocol that corresponds to TCP. It is a part of the TCP/IP prot

To compile a server in python, follow these steps: 1. The first step is to create a socket object. Call the socket constructor. For example: Socket = socket. socket (family, type) The family parameter represents the address family

The server is very similar to the client program. The client program is learned in the previous section. This section describes how to use socket to establish TCP and UDP servers. 1. TCP connection establishment method Generally, two steps are required for the client to establish a TCP connection, and four steps are required for the server process. for details, see the comparison below. Procedure TCP client TCP server Step 1

"Everything is file", and the file is operated with "open" "Read and Write" "Off" mode. Socket is an implementation of this pattern, the socket is a special kind of file, some of the socket function is the operation of it (read/write Io, open, close)The difference between a socket and file: The file module is

Python socket programming TCPPython socket programming TCPby wuxyServer. py Import socketimport commandsBUF_SIZE = 1024server_addr = ('2017. 0.0.1 ', 8888) server = socket. socket (

1. TCP connection Establishment Method Generally, two steps are required for the client to establish a TCP connection, and four steps are required for the server process. For details, see the comparison below. Procedure TCP client TCP Server Step 1 CreateSocketObject CreateSocketObject Step 2 CallConnect ()Establish a connection with the server SetSocketOptional) Step 3 None Bind to a port (or a specified Nic) Step 4 None

. Sk.recvfrom (Bufsize[.flag]) is similar to recv (), but the return value is (data,address). Where data is the string that contains the received information, address is the socket addressing that sent the data. Sk.send (String[,flag]) sends data from a string to a connected socket. The return value is the number of bytes to send, which may be less than the byte size of the string. That is, the specified co

=socket.socket (Socket.af_inet,socket. sock_raw,255)S.setsockopt (0, socket. IP_HDRINCL, 1)If this is set under OS X, the invalid argument error is reported in the location of the call to SendTo (), and then the problem is found on the third parameter 255 of the first line, which is testedUnder OS X, this parameter is set to 0 or 255 to be an error.Under Windows, this parameter is set to 0 or 255 without er

", data_size)) Conn.send (head_bytes) #发送数据部分 conn.send (out_res) conn.send (err_res) excEPT exception:break conn.close () phone.close () #客户端import socketimport structimport Jsonphone=socket.socket (s Ocket.af_inet,socket. SOCK_STREAM) ip_port= ("127.168.0.1", 8080) phone.connect (ip_port) #通信循环while True: #发消息 cmd=input (">>"). Strip () If not cmd:continue phone.send (bytes (cmd,encoding= "UTF8")) #收报头的长度 Head_struct=phone.recv (4) head_len=struc

Python-based socket Programming (III)What can be achieved with socket-based communication implemented earlier? In the TCP protocol communication is a user said a sentence, the service side to you back, you give the service side to say, the service side to give you back a sentence, so always friendly play down. And so o

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 so