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class Application:    def __init__(self):        self.callbacks = Callbacks()        # Load our Glade interface configuration        self.XML = gtk.glade.XML('somefile.glade')        # Automatically connect all signals to callbacks        self.XML.signal_autoconnect(self.callbacks)class Callbacks:    def on_windowMain_destroy(self, window):        print 'Exiting by user request.'        gtk.main_quit()