Listing 1. This simple Twisted server sends the time and then closes
the socket.

import time
from twisted.internet import protocol, reactor

class TimeProtocol(protocol.Protocol):
    def connectionMade(self):
        self.transport.write(
            'Hello. The time is %s' % time.time())
        self.transport.loseConnection()

class TimeFactory(protocol.ServerFactory):
    protocol = TimeProtocol

reactor.listenTCP(1100, TimeFactory())
reactor.run()