No, the whole point of __index__ is that it refuses *all* floats -- otherwise people will do approximate computations that for their simple test inputs give whole numbers, use them as sequence indices, and then find their code broken only when the computation incurs some floating point approximation. OTOH, is_integer() specifically asks whether a given real value is a whole number so you can cast it to int() without rounding, etc.
On Tue, Mar 20, 2018 at 5:32 PM, Chris Barker <chris.bar...@noaa.gov> wrote: > It seems .as_integer_ratio() has been resolved. > > what about the original .is_integer() request? (Or did I miss that > somehow?) > > Anyway, it seems like __index__() should play a role here somehow... isn't > that how you ask an object for the integer version of itself? > > Could float et al. add an __index__ method that would return a ValueError > if the value was not an integer? > > Of course, as pointed out earlier in this thread, an "exact" integer is > probably not what you want with a float anyway.... > > -CHB > > > On Tue, Mar 13, 2018 at 10:29 PM, Tim Peters <tim.pet...@gmail.com> wrote: > >> [Tim] >> >> An obvious way to extend it is for Fraction() to look for a special >> >> method too, say "_as_integer_ratio()". >> >> [Greg Ewing] >> > Why not __as_integer_ratio__? >> >> Because. at this point, that would be beating a dead horse ;-) >> _______________________________________________ >> 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/chris. >> barker%40noaa.gov >> > > > > -- > > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 526-6959 voice > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > chris.bar...@noaa.gov > > _______________________________________________ > 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/ > guido%40python.org > > -- --Guido van Rossum (python.org/~guido)
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