def do_startup(self):
Gtk.Application.do_startup(self)
menu = Gio.Menu()
menu.append("Preferences", "app.preferences")
menu.append("About", "app.about")
menu.append("Quit", "app.quit")
self.set_app_menu(menu)
self.add_simple_action('preferences', self.on_action_preferences_activated)
self.add_simple_action('about', self.on_action_about_activated)
self.add_simple_action('quit', self.on_action_quit_activated)
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