Actually, I suggested that:
float() + Rational() returns float
You're suggesting that the implicit conversion to float not happen here, and the user be forced to cast it to float? And you're saying Decimal does it that way.[
Yup.
I had another look at PEP 327 (the section on implicit construction) and the reasoning that got us to that behaviour wasn't quite what I thought. However, I think the point still holds for Rational - the conversion often won't be exact in either direction, so it's OK for Python to ask the programmer to confirm that they really want to make the conversion.
I think adding subsections modelled on PEP 327's "Explicit construction", "Implicit construction" and "Python usability" would be a big plus for the new Rational PEP. The layout Facundo used makes it obvious that issues of playing well with other types have been considered properly.
Cheers, Nick.
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Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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http://boredomandlaziness.skystorm.net
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