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[Python-Dev] Why is nan != nan?

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Steven D'Aprano wrote:

> I disagree -- if I ask:
> 
> 3.0 in [1.0, 2.0, float('nan'), 3.0]
> 
> I should get True, not an exception.

Yes, I don't think anyone would disagree that NaN should compare
unequal to anything that isn't a NaN. Problems only arise when
comparing two NaNs.

-- 
Greg

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