On Thu, Aug 30, 2018 at 5:51 AM Nicolas Rolin <nicolas.ro...@tiime.fr> wrote:
> > > >>> Right, but we already have some special cases: >> >> In [8]: Fraction(2, 3) ** Fraction(3, 1) >> Out[8]: Fraction(8, 27) >> >> Fraction.__pow__ already tries to return Fraction objects where possible. >> > > > I think the main point to see here is what the scope of a built-in > function should be. > For a fraction module in the stdlib, I would expect that it handle > "symbolically" any fraction multiplication or division of fractions, and > integer power of fractions. > Those are simple and useful cases, that can arise a bit anywhere. Power of > non-integer is a way more complex issue (notably because power of a > non-integer is not a function), and returning the same output as float is > at least an honest way of dealing with those cases. > But I'm only asking for fractional powers of -1, 0, and 1. Is that really a complex issue? You are right that the fractional power of -1 and 1 has multiple values, but the fractional power of zero has a unique value. > > I'm not really sure a stdlib should even try do deal with that. If I want > to have a symbolic way of handling complex power of fractions, I should > import a specific math library whose specific job is to get this right (the > same way if you want to do matrix stuff you have to import numpy). > That's how I use the fractions package. If you look at my example code, that seems like the kind of problem Fraction should make it easy to work with. And yet, there was a wrinkle where I had to calculate Fraction(-1) ** Fraction(a, b). > > -- > > *Nicolas Rolin* > > -- > > --- > You received this message because you are subscribed to a topic in the > Google Groups "python-ideas" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/python-ideas/aZIHpPhe0mw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > python-ideas+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- > > --- > You received this message because you are subscribed to a topic in the > Google Groups "python-ideas" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/python-ideas/aZIHpPhe0mw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > python-ideas+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. >
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