NonImplemented isn't treated as special when returned by __cmp__(); __cmp__ is not considered a binary operator like __add__. (__lt__ and friends *do* get treated as such -- but instead of __rlt__ we use __gt__, etc.)
--Guido On 8/2/07, Facundo Batista <[EMAIL PROTECTED]> wrote: > People: > > Pablo Hoffman opened this bug: "[1764761] Decimal comparison with None > fails in Windows". > > It's not a Decimal problem, see the differente behaviour of this basic > test in Linux and Windows: > > Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu > 4.1.2-0ubuntu4)] on linux2 > >>> class C(object): > ... def __cmp__(self, other): > ... return NotImplemented > ... > >>> c = C() > >>> print c < None > False > >>> print NotImplemented < None > False > > > Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit > (Intel)] on win32 > >>> class C(object): > def __cmp__(self, other): > return NotImplemented > > >>> c = C() > >>> print c < None > True > >>> print NotImplemented < None > False > > > Here's where I stop: don't know where to keep looking... Does somebody > know why is a difference here? > > Furthermore, we can check that is a problem regarding __cmp__: > > >>> class C(object): > def __cmp__(self, other): > return NotImplemented > def m(self): > return NotImplemented > > >>> c = C() > >>> print c < None > True > >>> print c.m() < None > False > > > This is not the first time I find an issue through Decimal regarding > NotImplemented, there was this thread: > > http://mail.python.org/pipermail/python-dev/2005-December/059046.html > > , but I don't know if that's a separate issue or not. > > Thanks for your help! > > -- > . Facundo > > Blog: http://www.taniquetil.com.ar/plog/ > PyAr: http://www.python.org/ar/ > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
