Mark Dickinson added the comment: from Guido:
> I have one minor nit on the current rational.py code: all internal > accesses to the numerator and denominator should use self._numerator > and self._denominator -- going through the properties makes it *much* > slower. Remember that Python function/method calls are slow, and never > optimized away. :-) This isn't quite as simple as doing s/.numerator/._numerator, since the current code makes use of the fact that the int and long types also implement .numerator and .denominator. Can we follow the approach that Decimal takes: convert subclasses of int and long to Rational before operating? At first sight it seems possible that this might actually slow down code that does a lot of mixed-mode int/long + Rational arithmetic, but I think this is unlikely. I'll implement this unless there are objections. I'm also wondering what the policy should be on return types: if a and b are instances of a subclass of Rational, should a+b have return type Rational, or return type equal to that of a and b? Current behaviour of various builtin types and Decimal suggests that a Rational should be returned. __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue1682> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
