code: def tearDown(self):
      os.chdir(self.old_cwd)
      shutil.rmtree(self.tmp_path)
      sysconfig._CONFIG_VARS.clear()
      sysconfig._CONFIG_VARS.update(self._backup_config_vars)
  
imports: import contextlib
  import subprocess
  import sysconfig
  import textwrap
  import unittest
  import os
  import shutil
  import tempfile
  from pathlib import Path
  from test import test_tools
  from test import support
  from test.support import os_helper, import_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 3 for calling the TestCParser obj's underlying member method code with example usage: obj.tearDown() without return types