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(python2.1-lib.info)Example 5

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Example
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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
     import socket
     
     HOST = ''                 # Symbolic name meaning the local host
     PORT = 50007              # Arbitrary non-privileged port
     s = socket.socket(socket.AF_INET, socket.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
     import socket
     
     HOST = 'daring.cwi.nl'    # The remote host
     PORT = 50007              # The same port as used by the server
     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     s.connect((HOST, PORT))
     s.send('Hello, world')
     data = s.recv(1024)
     s.close()
     print 'Received', `data`