Guido van Rossum wrote:
>> The patch notes say that you're actually inserting a keyword-only
>> argument - is this purely meant to be a stopgap measure so that
>> you've got a local (which could be put into a cell)?
>
> I'm not using a cell because I'm storing the result of calling
> super(Class, self) -- that is different for each instance, while a
> cell would be shared by all invocations of the same function.
I'm actually investigating another (possibly complementary) option at the
moment - adding an im_super attribute to methods, which would store either a
bound or unbound super instance when the bound or unbound method object is
created. method_new becomes:
static PyObject *
method_new(PyTypeObject* type, PyObject* args, PyObject *kw)
{
PyObject *func;
PyObject *self;
PyObject *classObj = NULL;
if (!_PyArg_NoKeywords("instancemethod", kw))
return NULL;
if (!PyArg_UnpackTuple(args, "method", 2, 3,
&func, &self, &classObj))
return NULL;
if (!PyCallable_Check(func)) {
PyErr_SetString(PyExc_TypeError,
"first argument must be callable");
return NULL;
}
if (self == Py_None)
self = NULL;
if (self == NULL && classObj == NULL) {
PyErr_SetString(PyExc_TypeError,
"unbound methods must have non-NULL im_class");
return NULL;
}
return PyMethod_New(func, self, classObj);
}
then in method_call we could have:
static PyObject *
method_call(PyObject *func, PyObject *arg, PyObject *kw)
{
PyObject *self = PyMethod_GET_SELF(func);
PyObject *klass = PyMethod_GET_CLASS(func);
PyObject *supervalue = PyMethod_GET_SUPER(func);
and populate the `super` argument from supervalue. I think im_super has uses
on its own (esp. for introspection).
>> Presumably with this approach you could
>> call the method like:
>>
>> A().func(1, 2, super=object())
>
> No, because that would be a syntax error (super as a keyword is only
> allowed as an atom). You could get the same effect with
>
> A().func(1, 2, **{'super': object()})
>
> but that's so obscure I don't mind.
I'd prefer to eliminate it, but that's a detail that can be taken care of
later.
Anyway, need to go to bed - have to be up in 6 hours.
Cheers,
Tim Delaney
_______________________________________________
Python-3000 mailing list
Python-3000@python.org
http://mail.python.org/mailman/listinfo/python-3000
Unsubscribe:
http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
