On 10/26/2012 12:23 PM, Steven D'Aprano wrote:
On Fri, 26 Oct 2012 04:00:03 -0400, Terry Reedy wrote:
This inconsistency is an intentional decision to
not propagate the insanity of nan != nan to Python collections.
That's a value judgement about NANs which is not shared by everyone.
Quite frankly, I consider it an ignorant opinion about NANs, despite what
Bertrand Meyer thinks. Reflectivity is an important property, but it is
not the only important property and it is not even the most important
property of numbers.
Reflexivity is one of the definitional properties of the mathematical
equality relationship and of equivalence relationships in general. It is
not specific to numbers. It is assumed by the concept and definition of
sets.
--
Terry Jan Reedy
--
http://mail.python.org/mailman/listinfo/python-list
