[Python-Dev] PEP for adding an sq_index slot so that any object, a or b, can be used in X[a:b] notation

Fri Feb 10 02:09:27 CET 2006

Guido van Rossum wrote:
> On 2/9/06, Travis Oliphant <oliphant.travis at ieee.org> wrote:
>>> This is very close to acceptance. I think I'd like to see the patch
> developed and submitted to SF (and assigned to me) prior to
> acceptance.
>>>>Copyright
>>>> This document is placed in the public domain
>>> If you agree with the above comments, please send me an updated
> version of the PEP and I'll check it in over the old one, and approve
> it. Then just use SF to submit the patch etc.
>
I uploaded a patch to SF against current SVN. The altered code compiles 
and the functionality works with classes defined in Python. I have yet 
to test against a C-type that defines the method.
The patch adds a new API function int PyObject_AsIndex(obj).
This was not specifically in the PEP but probably should be. The name 
could also be PyNumber_AsIndex(obj) but I was following the nb_nonzero 
slot example to help write the code.
-Travis