class_docstr: Pyglet backend for Canvas abstract class.
class_docstr_tok: ["Pyglet","backend","for","Canvas","abstract","class","."]
code: def _vispy_get_physical_size(self):
      if self._vispy_canvas is None:
          return
      w, h = self.get_framebuffer_size()
      return w, h
  
imports: from __future__ import division
  from packaging.version import Version
  from time import sleep
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util import keys
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 15 for calling the CanvasBackend obj's underlying member method code with example usage: obj._vispy_get_physical_size() and returns: w,  h