from twisted.internet import protocol, reactor

class Echo(protocol.Protocol):

    def dataReceived(self, data):

        self.transport.write(data)

class EchoFactory(protocol.Factory):

    def buildProtocol(self, addr):

        return Echo()

reactor.listenTCP(1234, EchoFactory())

reactor.run()

 

run server:

python testTwisted.py

 

run client:

telnet localhost 1234