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.bar...@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 <gu...@python.org> wrote: > >> On Wed, Mar 21, 2018 at 6:48 PM, Chris Barker <chris.bar...@noaa.gov> >> wrote: >> >>> On Wed, Mar 21, 2018 at 4:12 PM, Guido van Rossum <gu...@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 >>>> >>> ) >> > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/rob%40sixty-north.com > -- *Robert Smallshire | *Managing Director *Sixty North* | Applications | Consulting | Training r...@sixty-north.com | T +47 63 01 04 44 | M +47 924 30 350 http://sixty-north.com
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