[Python-Dev] [Python-checkins] r64424 - in python/trunk:Include/object.h Lib/test/test_sys.py Misc/NEWSObjects/intobject.c Objects/longobject.c Objects/typeobject.cPython/bltinmodule.c (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Thu Jun 26 16:52:57 CEST 2008
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Raymond Hettinger wrote:
FYI, I had already updated the patch to incorporate your suggestion. It checks index first and then float if index doesn't exist. The result makes it work with Decimal inputs.
Only sort of - the domain of the output is then constrained by what the builtin float type can represent, which strikes me as fairly inappropriate for what should be a lossless display operation (both fractions.Fraction and decimal.Decimal can represent a lot of numbers that float can't deal with properly). To use the old faithful example of this, given:
float(Decimal("1.1")) 1.1000000000000001
what happens for bin(Decimal("1.1")) with the patch version that uses float?
As I've said elsewhere in this thread, I'm certainly not averse to the basic idea of letting bin/oct/hex handle rational numbers as well as integers, I just don't see it as something we have to have in the current release cycle, and nor do I see it really working properly without adding a rational special method that returns a numerator/denominator 2-tuple (which would obviously require a PEP).
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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