[Python-Dev] Re: 3.10 or 4.0?

I've appreciated Anthony Sottile's flake8-2020 plugin (https://pypi.org/project/flake8-2020/), which adds checks for a variety of misuses of sys.version and sys.version_info that would lead to breakage on a Python 4.0, and/or 10.0, in addition to Python 3.10.