code: def handle_keypress(self, k):
          if k == "esc":
              self.save_file()
              raise urwid.ExitMainLoop()
          elif k == "delete":
              self.walker.combine_focus_with_next()
          elif k == "backspace":
              self.walker.combine_focus_with_prev()
          elif k == "enter":
              self.walker.split_focus()
              self.view.keypress(size, "down")
              self.view.keypress(size, "home")