code: def quit(self, *args):
          
          self.logger.info("Attempting to shut down the application...")
          if self.layout_file is not None:
              self.error_wrap(self.ds.write_layout_conf, self.layout_file)
  
          self.stop()
  
          self.w.root = None
          while len(self.ds.toplevels) > 0:
              w = self.ds.toplevels.pop()
              w.delete()
docs: Quit the application.