How to implement keyboard shortcuts (F1 etc.)

    def initialize_keybindings(self):
        self.widgets.window1.connect('key_press_event', self.on_key_event,1)
        self.widgets.window1.connect('key_release_event', self.on_key_event,0)

   def on_key_event(self,widget, event,state):
        CNTRL = SHIFT = ALT = 0
        keyname = gtk.gdk.keyval_name(event.keyval)
        self.verbosely_print("Key %s (%d) was pressed state: %d last: %s" % (keyname, event.keyval,state, self.data.key_event_last))
        if event.state & gtk.gdk.CONTROL_MASK:
            CNTRL = 1
            self.verbosely_print("Control was being held down")
        if event.state & gtk.gdk.MOD1_MASK:
            ALT = 1
            self.verbosely_print("Alt was being held down")
        if event.state & gtk.gdk.SHIFT_MASK:
            SHIFT = 1
            self.verbosely_print("Shift was being held down")
        if keyname in( "Shift_L","Shift_R"): return True # ignore shift key press
        if self.data.key_event_last[0] == keyname and self.data.key_event_last[1] == state : return True
        self.data.key_event_last = keyname,state