from twisted.internet import reactor, protocolclass Echo(protocol.Protocol):    """This is just about the simplest possible protocol"""        def dataReceived(self, data):        "As soon as any data is received, write it back."        self.transport.write(data)def main():    """This runs the protocol on port 8000"""    factory = protocol.ServerFactory()    factory.protocol = Echo    reactor.listenTCP(8000,factory)    reactor.run()# this only runs if the module was *not* importedif __name__ == ‘__main__‘:    main()

from twisted.internet import reactor, protocol# a client protocolclass EchoClient(protocol.Protocol):    """Once connected, send a message, then print the result."""        def connectionMade(self):        self.transport.write("hello, world!")        def dataReceived(self, data):        "As soon as any data is received, write it back."        print "Server said:", data        data2= raw_input()        if data2!=‘EOM‘:            self.transport.write(data2)        else:                    self.transport.loseConnection()        def connectionLost(self, reason):        print "connection lost"class EchoFactory(protocol.ClientFactory):    protocol = EchoClient    def clientConnectionFailed(self, connector, reason):        print "Connection failed - goodbye!"        reactor.stop()        def clientConnectionLost(self, connector, reason):        print "Connection lost - goodbye!"        reactor.stop()# this connects the protocol to a server runing on port 8000def main():    f = EchoFactory()    reactor.connectTCP("localhost", 8000, f)    reactor.run()# this only runs if the module was *not* importedif __name__ == ‘__main__‘:    main()