Michael Foord <mich...@voidspace.org.uk> added the comment:

Since the addition of __dir__, dir(obj) can return arbitrary values. Typically 
(I guess) this will be used to add dynamically created attributes that this 
function will fail to find - so it is *more* likely that we will fail to find 
something in dir than the reverse.

__dir__ could also be  used to filter non-public members that getattr(...) 
would find. I would find it odd that getattr finds a member that exists but 
this function fails. I think this function is more akin to getattr than dir.

Perhaps a better warning would be that this function may fail to find members 
that getattr finds?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9732>
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