On Thu, Aug 30, 2018 at 5:27 AM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
> Neil Girdhar wrote: > > we want branch continuity in the power. > > After all, floating point values have some inaccuracy, and we wouldn't > > want chaotic behavior, i.e., small changes to the power to have drastic > > changes to the result. > > > > This is not like Fraction where we know that x ** Fraction(1, 3) is a > > genuine cube root, and so why not return the principal cube, which we > > know to be real valued for real valued x? > > Because that would be possible only for a few special combinations > of Fractions ** Fractions that happen to have rational solutions. All > the others would still have to return float or complex results, > which could then be discontinuous with the rational ones. > > 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. -- > Greg > _______________________________________________ > 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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