import dbus
import dbus.glib
import dbus.service

class Shell(dbus.service.Object):
    def __init__(self, bus_name):
        dbus.service.Object.__init__(self, bus_name, '/us/ocjtech/Test/Shell')

bus=dbus.SessionBus()
bus_name = dbus.service.BusName('us.ocjtech.Test', bus=bus)

s1 = Shell(bus_name)
s1 = None
s2 = Shell(bus_name)