code: def _vispy_swap_buffers(self):
      pass
  
imports: import asyncio
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...app import Timer
  from ...util import keys
  from ._offscreen_util import OffscreenContext, FrameBufferHelper
label_desc: Use image node_id 8 for calling the CanvasBackend obj's underlying member method code with example usage: obj._vispy_swap_buffers() without return types