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

Calvin Spealman ironfroggy at gmail.com
Fri Jan 4 15:06:32 CET 2008

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 > _> ________________________ > Python-Dev mailing list > Python-Dev at python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: http://mail.python.org/mailman/options/python-dev/ironfroggy%40gmail.com >

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-- Read my blog! I depend on your acceptance of my opinion! I am interesting! http://ironfroggy-code.blogspot.com/

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