On Mon, Mar 22, 2010 at 11:00 AM, Raymond Hettinger <raymond.hettinger at gmail.com> wrote: > > On Mar 22, 2010, at 11:26 AM, Mark Dickinson wrote: >> >> Just for the record, I'd also prefer Decimal + Fraction -> Decimal. > > > Guido was persuasive on why float + Fraction --> float, > so this makes sense for the same reasons. > > For the implementation, is there a way to avoid the double rounding > in myfloat + myfrac.numerator / myfrac.denominator? > > Perhaps translate it to: > > f = Fractions.from_decimal(myfloat) + myfract # Lossless, exact addition > return f.numerator / f.denominator # Only one decimal context rounding applied. > > Elsewhere in the decimal module, there is a fundamental notion > that numbers are exact and only the results of operations are > rounded. For example, it is possible in decimal to add together > two high precision numbers but do so in a low precision context. Works for me. -- --Guido van Rossum (python.org/~guido)
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