[issue40203] Warn about invalid PYTHONUSERBASE

[Volker Weißmann]

Volker Weißmann <volker.weissmann at gmx.de> added the comment:

Forget the thing I said about "invalid//path", but my argument still stands for non existing paths or paths to something else than a directory.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40203>
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