----- Original Message -----
> I am trying to define a class whose instances should not be hashable,
> following:
> http://docs.python.org/2/reference/datamodel.html#object.__hash__
>
> class A:
> def __init__(self,a):
> self.value=a
> __hash__=None
>
>
> Then:
>
> >>> a=A(3)
> >>> hash(a)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: 'NoneType' object is not callable
> >>> hash([2])
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: unhashable type: 'list'
>
> I would expect the same error in both case and the error is confusing
> in the first case. What's the proper way of making an object non
> hashable?
>
> Olive
Try
class A:
def __hash__(self):
raise TypeError("unhashable type: '%s'" % self.__class__.__name__)
JM
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