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| Date | Wed, 09 Jul 2014 09:42:28 -0700 |
| From | Ethan Furman <ethan@stoneleaf.us> |
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| Subject | Re: NaN comparisons - Call For Anecdotes |
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On 07/08/2014 07:53 AM, Anders J. Munch wrote: > > So I make this claim: float.__eq__ implementing IEEE-754 NaN > comparison rules creates real problems for developers. And it has > never, ever, helped anyone do anything. > > "Never" is a strong claim, and easily disproven if false: Simply > provide a counterexample. So that is my challenge: If you have a > program (a pre-existing and useful one, not something artificial > created for this challenge) that benefits from NaN!=NaN and that would > fail if x==x for all float objects x, then please come forward and > show it, and I'll buy you a beer the next time I'm at PyCon. I would suggest you ask for this on the numerical mailing lists instead of here -- and you may not want to offer a beer to everyone that has an anecdote for NaN behavior being useful. -- ~Ethan~
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Re: NaN comparisons - Call For Anecdotes Ethan Furman <ethan@stoneleaf.us> - 2014-07-09 09:42 -0700
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