code: def get_brush_extents(self) -> t.Dict[str, t.Dict[str, t.Any]]:
      last_msg = self._last_data_per_type.get("brush_extents")
      if last_msg is None:
          raise self.no_data_received_error
      return last_msg
  
imports: import uuid
  import html
  import typing
  import json
  from pathlib import Path
  import IPython.display
  from ipykernel.comm import Comm
  from .None import experiment
  from .render import escapejs, make_experiment_standalone_page
label_desc: Use image node_id 3 for calling the IPythonExperimentDisplayed obj's underlying member method code with example usage: obj.get_brush_extents() and returns: last_msg