[issue18510] dict.__contains__ raises exception instead of returning False

[Ethan Furman]

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


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assignee: ethan.furman -> 
versions: +Python 2.7, Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18510>
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