[Python-Dev] Mixing float and Decimal -- thread reboot (original) (raw)

Raymond Hettinger raymond.hettinger at gmail.com
Mon Mar 22 21:33:20 CET 2010

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.

Raymond

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