Python 3.11 and above adding default module search path from the “PythonPath” registry key if the standard library was found already

Bug report

Bug description:

Please see https://discuss.python.org/t/behaviour-change-in-python-3-11-compatibility-break-or-genuine-fix/54729

There's also another issue highlited in the same module by the author, but it's not important as we can workaround by setting PYTHONNOUSERSITE as seen below.

"Including import site inadvertently enables the user site packages directory because the configuration with a ._pth file doesn’t explicitly disable it. I think it should because I can’t imagine why an embedding application would ever want that. You’ll have to set PYTHONNOUSERSITE to work around this."

CPython versions tested on:

3.10, 3.11, 3.12

Operating systems tested on:

Windows

Commencez par la discussion Python liée et reproduisez le comportement sous Windows avec CPython 3.10, 3.11 et 3.12. Suivez la manière dont la clé de registre PythonPath contribue au chemin de recherche de modules par défaut après la découverte de la bibliothèque standard ; le travail est terminé lorsque le comportement attendu et toute couverture de régression requise sont établis.