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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