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

[Raymond Hettinger]

Raymond Hettinger added the comment:

There's no bug here.  It is the way Python has worked for 23 years.

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nosy: +rhettinger
versions:  -Python 2.7, Python 3.2, Python 3.3

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<http://bugs.python.org/issue18510>
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