# Read username, output from empty factory, drop connections
from twisted.internet import protocol, reactor
from twisted.protocols import basic
class FingerProtocol(basic.LineReceiver):
    def lineReceived(self, user):
        self.transport.write(self.factory.getUser(user)+"\r\n")
        self.transport.loseConnection()
class FingerFactory(protocol.ServerFactory):
    protocol = FingerProtocol
    def getUser(self, user): return "No such user"
reactor.listenTCP(1079, FingerFactory())
reactor.run()