[Python-Dev] Symmetry arguments for API expansion (original) (raw)

Guido van Rossum guido at python.org
Tue Mar 13 11:23:38 EDT 2018

On Mon, Mar 12, 2018 at 10:01 PM, Tim Peters <tim.peters at gmail.com> wrote:

At heart, the Fraction() constructor is all about creating integer ratios, so is the most natural place to put knowledge of how to do so. A protocol for allowing new numeric types to get converted to Fraction would be more generally useful than just a weird method only datetime uses ;-)

Ironically, the various Fraction constructors calls as_integer_ratio() for floats and Decimals. From which follows IMO that the float and Decimal classes are the right place to encapsulate the knowledge on how to do it.

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