[docs] [issue15221] os.path.is*() may return False if path can't be accessed

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

The os.path.exists() docs already cover all the gory details of when it may be false due to limited permissions. The is* docs refer to this by their use of the word "existing", but that's probably too subtle.

I suggest adding an extra sentence to the docs of all affected functions:

"This always returns False if os.path.exists(path) returns False."

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15221>
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