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.
Raymond
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
