Steve Dower <steve.do...@python.org> added the comment:

Yeah, I think saying "return True if it provably exists and False if existence 
cannot be proven (and never raise)" is a good general rule for 
boolean-returning functions.

This definitely raises some edge cases where we can infer from certain error 
codes that a path exists, but I don't think it obliges us to prioritise fixing 
those in order to handle more obvious cases.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42855>
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