On 10/1/05, Travis Oliphant <oliphant@ee.byu.edu> wrote:
The new ndarray object of scipy core (successor to Numeric Python) is a C extension type that has a getitem defined in both the as_mapping and the as_sequence structure.
The as_sequence mapping is just so PySequence_GetItem will work correctly.
As exposed to Python the ndarray object has a .__getitem__ wrapper method.
Why does this wrapper call the sequence getitem instead of the mapping getitem method?
Is there anyway to get at a mapping-style __getitem__ method from Python?
Hmm... I'm sure the answer is in typeobject.c, but that is one of the more obfuscated parts of Python's guts. I wrote it four years ago and since then I've apparently lost enough brain cells (or migrated them from language implementation to to language design service :) that I don't understand it inside out any more like I did while I was in the midst of it. However, I wonder if the logic isn't such that if you define both sq_item and mp_subscript, __getitem__ calls sq_item; I wonder if by removing sq_item it might call mp_subscript? Worth a try, anyway. -- --Guido van Rossum (home page: http://www.python.org/~guido/)