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Sun Mar 4 14:56:38 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-March/117319.html

On Sat, 3 Mar 2012 18:20:22 -0800
Thomas Wouters <thomas at python.org> wrote:
> 
> I'm not sure how the ABCs, which are abstract declarations of semantics,
> tie into this specific implementation detail. ABCs work just as well for
> Python types as for C types, and Python types don't have this distinction.
> The distinction in C types has been *practically* useless for years, so why
> should it stay? What is the actual benefit here?

For one, it's certainly easier to implement an extension type if your
getitem function receives a Py_ssize_t directly, rather than a PyObject.
(it can be more efficient too)

Regards

Antoine.

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[Python-Dev] slice subscripts for sequences and mappings