Echo Server : socket « Network « Python Tutorial

import socket, traceback

host = '127.0.0.1'
port = 51423

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
s.listen(1)

while 1:
    try:
        clientsock, clientaddr = s.accept()
        print "Got connection from", clientsock.getpeername()
        while 1:
            data = clientsock.recv(4096)
            if not len(data):
                break
            clientsock.sendall(data)
        clientsock.close()
    except KeyboardInterrupt:
        raise
    except:
        traceback.print_exc()

21.2.socket
	21.2.1.	Get list of available socket options
	21.2.2.	Implementing Internet Communication
	21.2.3.	A server that will receive a connection from a client, send a string to the client, and close the connection.
	21.2.4.	socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	21.2.5.	Looking up port number
	21.2.6.	Get socket name and peer name
	21.2.7.	Send 10M of data with socket
	21.2.8.	Echo Server