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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Tue, 30 Oct 2012 15:55:41 -0600
Subject: Re: Negative array indicies and slice()
To: Python <python-list@python.org>
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Xref: csiph.com comp.lang.python:32508

On Tue, Oct 30, 2012 at 8:21 AM, Andrew Robinson
<andrew3@r3dsolutions.com> wrote:
> D'Apriano mentioned the named values, start, stop, step in a slice() which
> are an API and legacy issue;  These three names must also be stored in the
> interpreter someplace.  Since slice is defined at the "C" level as a struct,
> have you already found these names in the source code (hard-coded), or are
> they part of a .py file associated with the interface to the "C" code?

You mean the mapping of Python attribute names to C struct members?
That's in sliceobject.c:

static PyMemberDef slice_members[] = {
    {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
    {"stop", T_OBJECT, offsetof(PySliceObject, stop), READONLY},
    {"step", T_OBJECT, offsetof(PySliceObject, step), READONLY},
    {0}
};