On 10.02.2005, at 05:36, Guido van Rossum wrote:
And why would a Matrix need to inherit from a C-array? Wouldn't it make more sense from an OO POV for the Matrix to *have* a C-array without *being* one?
Definitely. Most array operations make no sense on matrices. And matrices are limited to two dimensions. Making Matrix a subclass of Array would be inheritance for implementation while removing 90% of the interface.
On the other hand, a Matrix object is perfectly defined by its behaviour and independent of its implementation. One could perfectly well implement one using Python lists or dictionaries, even though that would be pointless from a performance point of view.
Konrad.
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Konrad Hinsen
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