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