Raymond Hettinger wrote: > > [Mart Sõmermaa] >> To provide total ordering without __cmp__ one has to implement all of >> __lt__, __gt__, __le__, __ge__, __eq__ and __ne__. However, in all >> but a few cases it suffices only to provide a "real" implementation for >> e.g. __lt__ and define all the other methods in terms of it as follows: > > FWIW, I'm working on a solution for the problem using class decorators. > The idea is that it would scan a class and fill-in missing methods based > on the ones already there. That way, any one of the four ordering > relations can be provided as a starting point and we won't have to > annoint one like __lt__ as the one true underlying method. > > When it's ready, I'll bring it to python-dev for discussion. Is there something you don't like about this one: http://code.activestate.com/recipes/576529/ Michael > > > Raymond > _______________________________________________ > 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/fuzzyman%40voidspace.org.uk > -- http://www.ironpythoninaction.com/
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