I'm unable to answer your specific question but I might suggest another option. Guake console implements this very same behavior but using dbus:
In the dbusiface.py
file you can find:
import dbus
import dbus.service
import dbus.glib
import gtk
import guake.common
dbus.glib.threads_init()
DBUS_PATH = '/org/guake/RemoteControl'
DBUS_NAME = 'org.guake.RemoteControl'
class DbusManager(dbus.service.Object):
def __init__(self, guakeinstance):
self.guake = guakeinstance
self.bus = dbus.SessionBus()
bus_name = dbus.service.BusName(DBUS_NAME, bus=self.bus)
super(DbusManager, self).__init__(bus_name, DBUS_PATH)
@dbus.service.method(DBUS_NAME)
def show_hide(self):
self.guake.show_hide()
Among others methods. This is worth to explore. Please also note that Guake is developed using PyGtk and not PyGObject, but anyway you can get some ideas.