Address the python3 command issue on Windows

A lot of the support requests on pypa/packaging-problems are Windows users not being able to run the python3 command, since it is not shipped with the official CPython distribution. (recent example: pypa/packaging-problems#373)

Microsoft recently added a python3.exe stub that automatically opens the Windows Store page if you does not have the Store-provided Python installed. The problem is, the stub would silently do nothing if you pass any arguments to it, making users very confused.

I don’t have a perfect solution, unfortunately. The default python on macOS is still Python 2 (with a warning message), so that won’t work. py -3 is the recommended command for the official CPython distribution on Windows, but IIRC it is not shipped with the Windows Store distribution. The situation is quite bad, if I am being honest.

Commencez par examiner le texte de l’issue et l’exemple lié pypa/packaging-problems#373, puis comparez le comportement des commandes de CPython officiel et de Microsoft Store décrit ici. Définissez une recommandation concrète pour les utilisateurs de Windows et documentez la manière de gérer les arguments de python3 ; le travail est terminé lorsque les recommandations répondent à la confusion signalée sans dépendre d’un choix de commande non résolu.