Issue #18200: Back out usage of ModuleNotFoundError (8d28d44f3a9a)
Issue #15767: Back out 8d28d44f3a9a related to ModuleNotFoundError.
Issue #15767: Revert 3a50025f1900 for ModuleNotFoundError
Issue #15767: back out 8a0ed9f63c6e, finishing the removal of
ModuleNotFoundError.
Move test_import over to unittest.main().
Remove dead code in test_exceptions.
Issue #15767: Excise the remaining instances of ModuleNotFoundError
Issue #18347: ElementTree's html serializer now preserves the case of closing tags.
Issue #18347: ElementTree's html serializer now preserves the case of closing tags.