[issue38081] Different behavior of os.path.realpath('nul') in 3.7 and 3.8

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I added another PR with the additional error codes listed by Eryk Sun.

Theoretically we should be able to test most of them, but I haven't written those tests, and I'm not sure they'd prove enough to be worth the extra code. ntpath.realpath is a "best effort" function (realpath in all cases is, I guess), so given the choice between failing and returning a best-effort path, it's obviously better to go with the best-effort path.

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