"Python Learning" socket programming

A basic component of network programming is socket (socket)

A socket is an instance of the socket class in a socket module, and his instantiation requires 3 parameters:

The first parameter is the address family (the default is socket.af_inet, the prefix af_ represents the address family (addr family))

The second parameter is a stream (socket. Sock_stream, default value) or datagram (socket. SOCK_DGRAM) sockets

The third parameter is the protocol, which defaults to 0 (typically not available)

# Importing Socket library: Import socket# When you create a socket, af_inet specifies that the IPV4 protocol is used, and IPV6 is designated as AF_INET6. SOCK_STREAM Specifies the use of a stream-oriented TCP protocol S = socket.socket (socket.af_inet, socket. SOCK_STREAM) # Establish a connection: Note that the parameter is a tuple that contains the address and port number. S.connect (' www.baidu.com ', 80)

Socket has two methods: Send and Recv

S.send (' get/http/1.1\r\nhost:www.sina.com.cn\r\nconnection:close\r\n\r\n ')

S.RECV: Call recv to receive data with a desired (maximum) number of bytes, general recommendation 1024

An example of a simple server side

Import 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 '% addr c.send (' Thank-for-connecting ') C.close ()

# #升级版 # #使用面向对象的思维, a server based on the Socketserver class from socketserver import Tcpserver,streamrequesthandlerclass Handler ( Streamrequesthandler): def handle (self): addr = Self.request.getpeername () print ' Get connection from:%s%s '% add R Self.wfile.write (' Thank for Connection ') # "empty character indicates that the program is running Native server = TCPServer ((', 2345), Handler) server.serve_ Forever ()

An example of a client

Import sockets = Socket.socket () host = Socket.gethostname () port = 2233s.connect ((host, port)) print S.recv (2233)

"Python Learning" socket programming