[issue19002] ``dir`` function does not work correctly with classes.

[Ethan Furman]

Changes by Ethan Furman <ethan at stoneleaf.us>:


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versions:  -Python 2.6, Python 2.7, Python 3.1, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19002>
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