Raymond Hettinger added the comment:

Since the key is already accessible via the "args" attribute, what is the point 
of a new attribute?

>>> d = {}
>>> try:
        d['roger']
except KeyError as e:
        print(e.args)

        
('roger',)

----------
nosy: +rhettinger

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18163>
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