[Python-Dev] Mixing float and Decimal -- thread reboot (original) (raw)
Guido van Rossum guido at python.org
Mon Mar 22 21:48:09 CET 2010
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On Mon, Mar 22, 2010 at 12:45 PM, Mark Dickinson <dickinsm at gmail.com> wrote:
On Mon, Mar 22, 2010 at 8:33 PM, Raymond Hettinger <raymond.hettinger at gmail.com> wrote:
While we're on the topic, I think you should consider allowing the Fraction() constructor to accept a decimal input.
This corresponds to common schoolbook problems and simple client requests: "Express 3.5 as a fraction". >>> Fraction(Decimal('3.5')) Fraction(7, 2) Unlike typical binary floats which use full precision, it is not uncommon to have decimal floats with only a few digits of precision where the expression as a fraction is both useful and unsurprising. Sounds fine to me. Fraction already accepts decimal floating-point strings, so the implementation of this would be trivial (convert to string, then call the Fraction constructor).
Better, Fraction.from_decimal() already exists. ;-)
-- --Guido van Rossum (python.org/~guido)
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