[Python-Dev] PEP 485 review (isclose())

[Guido van Rossum]

On Mon, Mar 2, 2015 at 10:48 PM, Chris Barker <chris.barker at noaa.gov> wrote:

> On Mon, Mar 2, 2015 at 10:39 PM, Guido van Rossum <guido at python.org>
> wrote:
>
> (*) Adding it to the decimal module would require a discussion with
>> Raymond Hettinger, but Decimal users can probably copy and paste the
>> formula from the PEP.
>>
>
> yup -- but maybe worth putting in there while we're at it. though as
> Decimal is arbitrary precision, maybe it's not needed....
>

It's not really arbitrary precision, it's decimal *floating* point with a
large but finite precision, so all the same arguments apply.

But my reasoning was more that (at least when I was last involved in the
project) the decimal module tries to stick pretty close to the IEEE 754
standard (maybe nowadays a later version?) and random Python-only additions
are controversial.

-- 
--Guido van Rossum (python.org/~guido)
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