On Wed, Feb 20, 2013 at 12:38 AM, Olive
<diolu.remove_this_p...@bigfoot.com> wrote:
> 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
This is an old-style class. If you subclass object, it works as you expect:
>>> class A(object):
def __init__(self,a):
self.value=a
__hash__=None
>>> a=A(3)
>>> hash(a)
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
hash(a)
TypeError: unhashable type: 'A'
This is with Python 2.6. With Python 3 and later, that distinction no
longer exists.
ChrisA
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