docstr: SampleClass._private_doc.DOCSTRING
code: def _private_doc(self):
      """SampleClass._private_doc.DOCSTRING"""
      pass
  
imports: import functools
  from collections import namedtuple
  from unittest import mock
  import pytest
  from sphinx.application import Sphinx
  from sphinx.ext.napoleon import Config, _process_docstring, _skip_member, setup
label_desc: Use image node_id 1 for calling the SampleClass obj's underlying member method code with example usage: obj._private_doc() without return types