[python][pygi][ubuntu]Logout indicator for ubuntu Unity

logout-indicator.py

#!/usr/bin/python3
# Logout indicator for ubuntu Unity

# module of python3-gi (PyGI)
from gi.repository import GLib
from gi.repository import Gio
from gi.repository import Gtk
from gi.repository import AppIndicator3

def dbus_logout(w, arg):
    Gtk.main_quit()
    #cancel = Gio.Cancellable.new()
    cancel = None
    timeout = -1
    conn = Gio.bus_get_sync(Gio.BusType.SESSION, cancel)
    session = Gio.DBusProxy.new_sync(
        conn, 0, None,
        "org.gnome.SessionManager", "/org/gnome/SessionManager",
        "org.gnome.SessionManager", cancel)
    # see: https://people.gnome.org/~mccann/gnome-session/docs/gnome-session.html
    args = GLib.Variant("(u)", (1,))
    #args = GLib.Variant("(u)", (0,))
    session.call_sync("Logout", args, 0, timeout, cancel)
    pass

ind = AppIndicator3.Indicator.new(
    "logout indicator",
    "application-exit", # icons at /usr/share/icons/Humanity/*/*/
    AppIndicator3.IndicatorCategory.SYSTEM_SERVICES)
ind.set_status(AppIndicator3.IndicatorStatus.ACTIVE)

menu = Gtk.Menu()
ind.set_menu(menu)

mitem = Gtk.MenuItem("force logout")
menu.append(mitem)
mitem.show()
mitem.connect("activate", dbus_logout, None)

mitem = Gtk.SeparatorMenuItem()
menu.append(mitem)
mitem.show()

mitem = Gtk.MenuItem("quit indicator")
menu.append(mitem)
mitem.show()
mitem.connect("activate", lambda w, arg: Gtk.main_quit(), None)

Gtk.main()