does not work

time_tracker.py

        glib.timeout_add(100, self.new_title)
        # glib.timeout_add(100, self.worker)
        # self.worker()

    def new_title(self):
        window = False
        while not window:
            window = wnck.screen_get_default().get_active_window()
        title = window.title()
        if self.title != title:
            self.title = title
            print self.title
            return True
        return True