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

[Ethan Furman]

Ethan Furman added the comment:

Commenting further:

    some_key in dict

is conceptually the same as 

    some_key in dict.keys()

which /would/ return False for an unhashable key -- at least it did in 2.x; for 3.x you have to say

    some_key in list(dict.keys())

which seems like a step backwards.

Is it worth changing __contains__ and keys() to be in line with equality?

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title: if Enum member value is not hashable an exception is raised -> dict.__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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