code: def test_walk_packages_raises_on_string_or_bytes_input(self):
      str_input = "test_dir"
      with self.assertRaises((TypeError, ValueError)):
          list(pkgutil.walk_packages(str_input))
  
      bytes_input = b"test_dir"
      with self.assertRaises((TypeError, ValueError)):
          list(pkgutil.walk_packages(bytes_input))
  
imports: from pathlib import Path
  from test.support.import_helper import unload, CleanImport
  from test.support.warnings_helper import check_warnings, ignore_warnings
  import unittest
  import sys
  import importlib
  from importlib.util import spec_from_file_location
  import pkgutil
  import os
  import os.path
  import tempfile
  import shutil
  import zipfile
label_desc: Use image node_id 9 for calling the PkgutilTests obj's underlying member method code with example usage: obj.test_walk_packages_raises_on_string_or_bytes_input() without return types