PEP8 compliance of generated Python code
> Also, since the files don't appear to be [PEP8](https://peps.python.org/pep-0008/) compliant we should append`# flake8: noqa` for [Flake8](https://flake8.pycqa.org/en/3.1.1/user/ignoring-errors.html#ignoring-entire-files).

_Originally posted by @davetapley in https://github.com/kaitai-io/kaitai_struct/issues/1058#issuecomment-1652507794_
            