from twisted.internet import protocol, reactor, endpoints
from twisted.protocols import basic

class FingerProtocol(basic.LineReceiver):
    def lineReceived(self, user):
        self.transport.write(b"No such user\r\n")
        self.transport.loseConnection()

class FingerFactory(protocol.ServerFactory):
    protocol = FingerProtocol

fingerEndpoint = endpoints.serverFromString(reactor, "tcp:1079")
fingerEndpoint.listen(FingerFactory())
reactor.run()