Hi Christian,
On Tue, Jun 25, 2013 at 03:03:51PM +0200, Christian Stump wrote:
> I am sure some of you have been thinking about that before:
>
> sage: a = Permutation([3,2,1])
> sage: b = Partition([3,2,1])
> sage: c = Composition([3,2,1])
> sage: a == b == c
> True
> sage: hash(a) == hash(b) == hash(c)
> True
>
> Is this desired behaviour?
It's more like an accident in history. It's not incorrect per se, but
I agree it's not great in case one has a dictionary containing a mix
of objects. This "feature" will disappear by itself when we will
(finally!) fix Permutation/Partition/... to use the Cythonized class
ClonableList instead of CombinatorialObject: I just checked and
ClonableList._hash_ takes the parent into account.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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