Unexpected results comparing float to Fraction

Steven D'Aprano steve+comp.lang.python at pearwood.info
Mon Jul 29 19:29:48 CEST 2013


On Mon, 29 Jul 2013 13:08:20 -0400, Terry Reedy wrote:

> In other words, there can be multiple unequal Franctions that have the
> same float value: for instance, Fraction(1,3) and
> Fraction(6004799503160661, 18014398509481984)
> 
>  > So from that standpoint it makes sense to me to cast to Fraction when
>  > comparing.
> 
> Otherwise, == becomes non-transitive

This is Python, and we can make __eq__ methods that do anything, 
including be non-transitive, non-reflexive, and nonsensical if we like :-)

But I take your point, and that makes sense.


-- 
Steven



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