> You're making a mountain of a molehill here, Alex. I know that in > group theory there are non-Abelian groups (for which AB != BA), but > I've never encountered one myself in programming; more typical such > non-commutative operations are modeled as __add__ rather than as > __mul__. I need to give myself a small slap on the forehead head, because of course non-square matrix multiplication is an excellent example where AB != BA. However even there, Ax == xA when x is a singleton, and the issue only arises for integers, so I still don't think there are use cases. --Guido van Rossum (home page: http://www.python.org/~guido/)
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