On Sun, Mar 28, 2010 at 17:55, Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
> 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.NaN includes real numbers. Although a NaN is originally produced for results that are not real numbers, further operations could produce a real number; we'd never know as NaN has no precision. Extending with complex numbers instead gives enough precision to show how this can happen. -- Adam Olsen, aka Rhamphoryncus _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
