code: def get_cavity_reader():
      filename = examples.download_cavity(load=False)
      return pv.get_reader(filename)
  
imports: import os
  import platform
  import numpy
  import pytest
  import pyvista
  from pyvista import examples
  from pyvista.core.utilities.fileio import _try_imageio_imread
  from pyvista.examples.downloads import download_file
label_desc: Use image node_id 26 for calling a global function with example usage: get_cavity_reader() and returns: pv