[Python-Dev] long(float('nan')) conversion

[Calvin Spealman]

Yes, I realize now that I was on the wrong box running the wrong
version, so ignore me if I'm stupid and its irrelevant!

On Jan 4, 2008 9:02 AM, Calvin Spealman <ironfroggy at gmail.com> wrote:
> On Jan 4, 2008 8:07 AM, Christian Heimes <lists at cheimes.de> wrote:
> > Hello!
> >
> > Bug http://bugs.python.org/issue1481296 describes a problem where
> > long(float('nan')) causes a seg fault on Mac OS X. On other platforms it
> > returns 0L, e.g.
> >
> > Python 2.5.1 (r251:54863, Oct  5 2007, 13:36:32)
> > [GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> float('nan')
> > nan
> > >>> long(float('nan'))
> > 0L
>
> I get even more fun results!
>
> Python 2.4.4 (#1, Oct 18 2006, 10:34:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> l = long(float('nan'))
> 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000L
> >>> int(l)
> 0
> >>> long(int(l))
>
> 0L
>
> > My patch to Python 2.6 adds an explicit check for NaNs to always return
> > 0L. It did feel a bit strange but it's the default on some platforms.
> > Today an user pointed out that he doesn't like the patch, too.
> >
> > How should the problem be solved? In my humble opinion
> > long(float('nan')) should return 0L in Python 2.5.2 for b/w
> > compatibility and raise a ValueError or OverflowError in Python 2.6+.
> >
> > Christian
> >
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> > Unsubscribe: http://mail.python.org/mailman/options/python-dev/ironfroggy%40gmail.com
> >
>
>
>
> --
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>



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Read my blog! I depend on your acceptance of my opinion! I am interesting!
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