[Python-Dev] Symmetry arguments for API expansion

[Robert Smallshire]

In the PR I've submitted, that's essentially what I'm doing for the default
Real.is_integer() implementation. The details differ slightly, in that I
rely on the int() constructor to call __trunc__(), rather than introduce a
new dependency on the math module.

On Tue, 27 Mar 2018 at 21:29, Chris Barker <chris.barker at noaa.gov> wrote:

> I know this is all done, but for completeness’ sake:
>
> I just noticed math.trunc() and __trunc__().
>
> So wouldn’t the “correct” way to check for an integral value be something
> like:
>
> obj.__trunc__() == obj
>
> I don’t think this has any bearing on adding is_integer() methods to
> numeric objects, but might if we wanted to add a generic is_integer()
> function somewhere.
>
> In any case, I don’t recall it being mentioned in the conversation, so
> thought I’d complete the record.
>
> -CHB
>
>
>
>
>
> On Wed, Mar 21, 2018 at 8:31 PM Guido van Rossum <guido at python.org> wrote:
>
>> On Wed, Mar 21, 2018 at 6:48 PM, Chris Barker <chris.barker at noaa.gov>
>> wrote:
>>
>>> On Wed, Mar 21, 2018 at 4:12 PM, Guido van Rossum <guido at python.org>
>>> wrote:
>>>
>>>> Thank you! As you may or may not have noticed in a different thread,
>>>> we're going through a small existential crisis regarding the usefulness of
>>>> is_integer() -- Serhiy believes it is not useful (and even an attractive
>>>> nuisance) and should be deprecated. OTOH the existence of
>>>> dec_mpd_isinteger() seems to validate to me that it actually exposes useful
>>>> functionality (and every Python feature can be abused, so that alone should
>>>> not
>>>>
>>> )
>>
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