[Python-Dev] __index__ clipping

[Guido van Rossum]

OK, I'll withdraw from this discussion again. Thanks all!

On 8/11/06, Nick Coghlan <ncoghlan at gmail.com> wrote:
> Travis E. Oliphant wrote:
> > Travis E. Oliphant wrote:
> >> Here is my C-API proposal
> >>
> >> 1) PyIndex_Check(obj)
> >>
> >>    Similar to PyIter_Check(obj) as it just checks for whether or not the
> >> object can call nb_index.  Actually implemented as a macro.
> >>
> >> 2) PyObject* PyNumber_Index(obj)
> >>
> >>    Simple interface around nb_index that calls it if possible and returns
> >>    TypeError if not (or if the result does not end up in an exact
> >>    int-or-long
> >>
> >> 3) Py_ssize_t PyNumber_AsSsize_t(obj, err)
> >>
> >>     This converts the object to a Py_ssize_t by using the nb_index call
> >>     if possible.  The err argument is a Python error object and specifies
> >>     what error should be raised should the conversion from Int-or-Long to
> >>     Py_ssize_t cause Overflow.
> >>
> >>     If err is NULL, then no error will be raised and the result will be
> >> clipped.  Other-wise the corresponding error will be set.  Internally
> >> PyExc_IndexError and PyExc_OverflowError will be the errors used.
> >>
> >
> > This proposal is implemented as patch 1538606
> > http://sourceforge.net/tracker/index.php?func=detail&aid=1538606&group_id=5470&atid=305470
>
> This interface is a lot simpler to explain and use than the one in my patch,
> and more in tune with the rest of the C API.
>
> I had a minor documentation suggestion which I put on the tracker item, but
> other than that +1 on using Travis's patch instead of mine (I've already
> rejected my own tracker item).
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
> ---------------------------------------------------------------
>              http://www.boredomandlaziness.org
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)