Some ntpath/posixpath functions unusable on foreign OS

The os.path docs intro includes:

Note: Since different operating systems have different path name conventions, there are several versions of this module in the standard library. The os.path module is always the path module suitable for the operating system Python is running on, and therefore usable for local paths. However, you can also import and use the individual modules if you want to manipulate a path that is always in one of the different formats. They all have the same interface:

• posixpath for UNIX-style paths
• ntpath for Windows paths

But we don't explain that some of the functions in ntpath and posixpath aren't suitable for usage on a "foreign" OS, e.g. that using ntpath.realpath() from POSIX is a bad idea.

These functions are safe because they do purely lexical work:

• basename
• commonpath
• commonprefix
• dirname
• isabs
• join
• normcase
• normpath
• split
• splitdrive
• splitroot
• splitext

These functions are probably unsafe because they rely on details of the host OS (e.g. via the os module):

• abspath
• exists
• lexists
• expanduser
• expandvars
• getatime
• getmtime
• getctime
• getsize
• isfile
• isdir
• isjunction
• islink
• ismount
• isdevdrive
• realpath
• relpath
• samefile
• sameopenfile
• samestat
• supports_unicode_filenames

Linked PRs

• gh-119772

Commencez par l’introduction de la documentation de os.path liée dans l’issue et examinez les listes de fonctions lexicales et dépendantes de l’hôte. Consultez le PR lié gh-119772 avant d’effectuer des modifications. C’est terminé lorsque la documentation explique clairement quelles fonctions de ntpath et posixpath sont sûres sur un système d’exploitation étranger et lesquelles dépendent du système d’exploitation hôte.