Hi all, I just wanted to add a small comment on this discussion, which I'd been following via the newsgroup mirror. Python is picking up a lot of steam in the scientific computing community, and in science it is quite common to encounter non-commutative multiplication. Just to remind Guido from his old math days :), even for square matrices, AB!=BA in most cases. The Matrix class supplied with Numpy is one example of a widely used library which implements '*' as a non-commutative multiplication operator. From what I've read, I realize that this is quite a subtle and difficult bug to treat. I just wanted to add a data point for you folks to consider. Please don't dismiss non-commutative multiplication as too much of an obscure corner case, it is a daily occurrence for a growing number of python users (scientists). Thanks, Fernando.
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