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Tue Jul 8 16:58:33 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-July/135380.html

Chris Angelico wrote:
>
> This is off-topic for this thread, but still...
>
> The trouble is that your "arguably just as wrong" is an
> indistinguishable case. If you don't want two different calculations'
> NaNs to *ever* compare equal, the only solution is to have all NaNs
> compare unequal
For two NaNs computed differently to compare equal is no worse than 2+2 
comparing equal to 1+3.  You're comparing values, not their history.

You've prompted me to get a rant on the subject off my chest, I just posted an 
article on NaN comparisons to python-list.

regards, Anders

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[Python-Dev] == on object tests identity in 3.x