[issue22716] Add reference to the object missing an attribute to AttributeError

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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resolution: duplicate -> 
stage: resolved -> 
superseder: Add an 'attr' attribute to AttributeError -> 
versions: +Python 3.5 -Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22716>
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