Emanuel Barry added the comment: This is due to the fact that Python 3 added the ability to define only __eq__ and get a free __ne__ defined. If my memory serves me right, functools.total_ordering was added in 3.2 and then backported to 2.x - where the relationship with __eq__ and __ne__ is not present. total_ordering doesn't do anything to touch __ne__ as it expects Python itself to do so (which it doesn't in 2.x).
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