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Next: 7.3 select Up: 7.2 socket Previous: 7.2.1 Socket Objects

7.2.2 Example

Here are two minimal example programs using the TCP/IP protocol: a server that echoes all data that it receives back (servicing only one client), and a client using it. Note that a server must perform the sequence socket(), bind(), listen(), accept() (possibly repeating the accept() to service more than one client), while a client only needs the sequence socket(), connect(). Also note that the server does not send()/recv() on the socket it is listening on but on the new socket returned by accept().

# Echo server program from socket import * HOST = '' # Symbolic name meaning the local host PORT = 50007 # Arbitrary non-privileged server s = socket(AF_INET, SOCK_STREAM) s.bind((HOST, PORT)) s.listen(1) conn, addr = s.accept() print 'Connected by', addr while 1: data = conn.recv(1024) if not data: break conn.send(data) conn.close()

# Echo client program from socket import * HOST = 'daring.cwi.nl' # The remote host PORT = 50007 # The same port as used by the server s = socket(AF_INET, SOCK_STREAM) s.connect((HOST, PORT)) s.send('Hello, world') data = s.recv(1024) s.close() print 'Received', `data`

See Also:

Module SocketServer:: classes that simplify writing network servers.