#!/usr/bin/env python
import dbus, gobject
from dbus.mainloop.glib import DBusGMainLoop
class NPNtest:

	def __init__(self):
		dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
		#self.bus = dbus.SessionBus()
		self.bus = dbus.SystemBus()

		#self.bus.add_signal_receiver (monitor_session)

		self.dbusSystemObject = "com.redhat.NewPrinterNotification"
		self.dbusSystemObjectPath = "/com/redhat/NewPrinterNotification"
		self.bus.add_signal_receiver(self.callback, dbus_interface=self.dbusSystemObject, path=self.dbusSystemObjectPath)

		self.loop = gobject.MainLoop()
		self.loop.run()

	def callback(self,*args):
		print "HERE"

l = NPNtest()