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
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