Eryk Sun <[email protected]> added the comment:
> _Py_abspath/_getfullpathname does not always call GetFullPathNameW on 3.11.
Also, PathCchSkipRoot() doesn't recognize forward slash as a path separator, so
_Py_isabs() is wrong in many cases compared to the same path that uses
backslash as the path separator.
For example, _Py_isabs() wrongly returns false in the following cases, so
GetFullPathNameW() is called, and ironically the misbehavior of _Py_isabs()
leads to the correct result.
>>> os.path.abspath('//spam//eggs. . .')
'\\\\spam\\eggs'
>>> os.path.abspath('C:/spam. . .')
'C:\\spam'
>>> os.path.abspath('C:/nul')
'\\\\.\\nul'
_Py_isabs() returns true in the following cases, so only normpath() is called:
>>> os.path.abspath(r'\\spam\\eggs. . .')
'\\\\spam\\\\eggs. . .'
>>> os.path.abspath('C:\\spam. . .')
'C:\\spam. . .'
>>> os.path.abspath('C:\\nul')
'C:\\nul'
As the above shows, normpath() doesn't remove trailing dots and spaces from the
last component of a path, and it doesn't special case DOS devices in the last
component of a drive-letter path. The latter is still implemented for the NUL
device in Windows 11 and implemented for all DOS devices in Windows 8.1 and 10
(e.g. CON, CONIN$, CONOUT$, AUX, PRN, COM<1-9>, LPT<1-9>).
I would prefer to remove the _Py_isabs() check from _Py_abspath() in Windows,
unless there's a strong case for startup performance, in which case I'd prefer
to revert the change to nt._getfullpathname() and only use _Py_abspath() during
startup.
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<https://bugs.python.org/issue46287>
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