[Numpy-discussion] What type should / return in python 3k when applied to two integer types?

josef.pktd@gmai... josef.pktd@gmai...
Fri Aug 28 09:08:28 CDT 2009


On Fri, Aug 28, 2009 at 9:55 AM, Pauli Virtanen<pav@iki.fi> wrote:
> Fri, 28 Aug 2009 09:46:39 -0400, Neal Becker kirjoitti:
>
>> Robert Kern wrote:
>>
>>> On Thu, Aug 27, 2009 at 14:22, Christopher
>>> Barker<Chris.Barker@noaa.gov> wrote:
>>>
>>>> By the way -- is there something about py3k that changes all this? Or
>>>> is this just an opportunity to perhaps make some backward-incompatible
>>>> changes to numpy?
>>>
>>> Python 3 makes the promised change of int/int => float.
>>
>> Does that mean that we want numpy to do the same?  I'm not so sure.
>> Sounds like opening a can of worms (numpy has more types to worry about
>> than just int and float.  If we start playing strange games we may
>> regret it.)
>
> I believe we want to. This is not really a strange trick: it's just that
> in Python 3, the operator / is true_division, and // is floor_division.
> I believe any worms released by this are mostly small and tasty...
>
> The main issue is probably just choosing an appropriate float return
> type, and personally I believe this should be same as numpy's default
> float.

and getting the infs and nans as in true float division not as in np.true_divide

Josef

>
> --
> Pauli Virtanen
>
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