import dbus bus = dbus.bus.BusConnection("unix:path=/var/run/dbus/system_bus_socket") object = bus.get_object('com.nokia.mce', '/com/nokia/mce/request', introspect=False) interface = dbus.Interface(object, dbus_interface='com.nokia.mce.request') try: interface.devlock_callback(dbus.Int32("2"), timeout = 0) except dbus.exceptions.DBusException: pass