On Thu, 27 Jul 2000, Guido van Rossum wrote:
Another solution: require a class variable to indicate the class's awareness: e.g. you must define __getslice_takes_three_args__ when __getslice__(lo, hi, step) is supported, otherwise the call goes to __getitem__(slice(lo, hi, step)).
I don't think it can work: what about inheritance? Think of these two cases: class A: __getslice_takes_3_args__ def __getslice__(...): ... class B(A): def __getslice__(...): ... # something completely different and class C(A): def __getslice__(self, *args): # do something apply(A.__getslice__, (self,)+args)
This is a bit like the feature flag bits in the type struct.
Which are ugly as hell too.....and only work because builtin types have a flat inheritance. oh-well-python-3000-is-just-around-the-corner-ly y'rs, Z. -- Moshe Zadka <moshez@math.huji.ac.il> There is no IGLU cabal. http://advogato.org/person/moshez