[Python-ideas] Suggestion: Extend integers to include iNaN

[Steve Barnes]

On 30/09/2018 16:13, David Mertz wrote:
> On Sun, Sep 30, 2018 at 11:01 AM Steve Barnes <gadgetsteve at live.co.uk 
> <mailto:gadgetsteve at live.co.uk>> wrote:
> 
>     Adding inf & -inf would be nice but to do so we would need a better
>     name
>     than NaNAwareInt.
> 
> 
> My placeholder name is deliberately awkward.  I think it gestures at the 
> concept for discussion purposes though.
> 
>     It would also be nice if Decimal(NaNAwareInt('nan')) = Decimal('NaN'),
>     float(NaNAwareInt('nan')) = float('nan'), etc.
> 
> 
> This seems like bad behavior given (per IEEE-754 spec):
> 
>      >>> float('nan') == float('nan')
>     False
>      >>> nan = float('nan')
>      >>> nan == nan
>     False
> 
> -- 
> Keeping medicines from the bloodstreams of the sick; food
> from the bellies of the hungry; books from the hands of the
> uneducated; technology from the underdeveloped; and putting
> advocates of freedom in prisons.  Intellectual property is
> to the 21st century what the slave trade was to the 16th.
David,

Note that my statements above had a single = i.e. 
float(NaNAwareInt('nan')) produces float('nan'), etc., as does:

In [42]: nan = decimal.Decimal('nan')

In [43]: decimal.Decimal(nan)
Out[43]: Decimal('NaN')

In [44]: float(nan)
Out[44]: nan

and vice-versa.

-- 
Steve (Gadget) Barnes
Any opinions in this message are my personal opinions and do not reflect 
those of my employer.

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