Building an Echo Server Using Tornado(superjared.com)

  from twisted.internet import protocol, reactor

  class Echo(protocol.Protocol):    
      def dataReceived(self, data):
          self.transport.write(data)

  if __name__ == '__main__':
      factory = protocol.ServerFactory()
      factory.protocol = Echo
      reactor.listenTCP(8000,factory)
      reactor.run()

    from eventlet import api

    def handle_socket(address):
        sock, ip = address
        while True:
           sock.send(sock.recv(1))

    api.tcp_server(api.tcp_listener(('0.0.0.0', 6000)), handle_socket)

    socket -server acceptConnections 9999
    proc acceptConnections {fd clientaddr clientport} {
        fconfigure $fd -blocking 0
        fileevent $fd readable [list replyToClient $fd]
    }
    proc replyToClient fd {
        set s [read $fd]
        puts -nonewline $fd $s
        flush $fd
    }
    vwait forever