Steve Dower <steve.do...@python.org> added the comment:
ntpath.ismount() is using a name-only check here, it never tries to resolve the
path if splitdrive() returns (anything, one_of("", "/", "\\"))
Now it's not clear whether handling "" is intended there, but that's certainly
the difference (Python 2 required exactly one character in that part). And it
appears to be consistent back to 3.4, so I'm not sure we can or should fix
anything. The only thing 'F:' can ever be is a mount point.
However, we should probably fix the fact that C: returns False. This is because
we call abspath(path), and "x:" is a relative path. When the drive does not
match the current working drive, you get "x:\\". But when it _does_ match, you
get the current working directory, which (unless it's the root directory) is no
longer a mount point.
Perhaps the best fix for that is to just say that "x:" is a relative path and
hence never a mount point? Which would be the same as switching back to the
Python 2 behaviour, but would be a much better reason.
----------
nosy: +eryksun
title: os.path.ismount() returns true in python 3.7.4 and false in 2.7.14 ->
os.path.ismount() returns False for current working drive
type: -> behavior
versions: +Python 3.8, Python 3.9
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<https://bugs.python.org/issue38948>
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