[issue18510] dict.__contains__ and dict.keys().__contains__ raises exception instead of returning False

[Ethan Furman]

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


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title: dict.__contains__ raises exception instead of returning False -> dict.__contains__ and dict.keys().__contains__ raises exception instead of returning False

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