On Sat, Aug 15, 2009 at 8:09 AM, Xavier Ho<cont...@xavierho.com> wrote: > Hey all, > > I've recently made my way to Python 3.1 and I'm not seeing __cmp__() in the > documentation. > > Is there a substitution for this special method in 3.1, or do I really have > to define all six rich comparison methods to work it out?
I don't think so. Quoting http://docs.python.org/dev/py3k/reference/datamodel.html "There are no swapped-argument versions of [the comparison] methods (to be used when the left argument does not support the operation but the right argument does); rather, __lt__() and __gt__() are each other’s reflection, __le__() and __ge__() are each other’s reflection, and __eq__() and __ne__() are their own reflection." I believe this means you only need to define one method from each of the following pairs to get all the operators working: * __eq__ or __ne__ * __lt__ or __gt__ * __ge__ or __le__ Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
