PyArg_ParseTupleAndKeywords in Python3.1

[casevh]

On Dec 17, 11:14 am, Joachim Dahl <dahl.joac... at gmail.com> wrote:
> In the Ubuntu 9.10 version of Python 3.1 (using your patch), there's a
> related bug:
>
> >>> foo(b='b')
>
> will set the value of a in the extension module to zero, thus clearing
> whatever
> default value it may have had.  In other words, the optional character
> arguments
> that are skipped seem to be nulled by PyArg_ParseTupleAndKeywords().

The following code seems to work fine for me:

static PyObject* foo(PyObject *self, PyObject *args, PyObject *kwrds)
{
    int a=65, b=66;
    char *kwlist[] = {"a", "b", NULL};
    if (!PyArg_ParseTupleAndKeywords(args, kwrds, "|CC", kwlist, &a,
&b))
        return NULL;
    return Py_BuildValue("(CC)", a, b);
}

The default values seem to remain as 'A' and 'B'.

>>> foo()
('A', 'B')
>>> foo(b='b')
('A', 'b')
>>> foo()
('A', 'B')
>>> foo('a')
('a', 'B')
>>> foo('a', b='b')
('a', 'b')
>>> foo()
('A', 'B')
>>>

casevh