Help with C API

[Nick Jacobson]

In the Python Cookbook, Luther Blisset wrote a very useful class with
the Python C API.  It takes a Python list of elements and copies it
member by member into a C array.

Here it is, (slightly modified by me):

static PyObject *totaldoubles(PyObject *self, PyObject *args) {
	PyObject *seq, *item, *fitem;
	double *dbar, result;
	int i, seqlen;

	if (!PyArg_ParseTuple(args, "O", &seq)) return NULL;
	seq = PySequence_Fast(seq, "argument must be iterable");
	if (!seq) return NULL;

	seqlen = PySequence_Fast_GET_SIZE(seq);
	dbar = malloc(seqlen * sizeof(double));
	if (!dbar) { Py_DECREF(seq); return NULL; }

	for (i=0; i < seqlen; i++) {
		item = PySequence_Fast_GET_ITEM(seq, i);		
		if (!item) { Py_DECREF(seq); free(dbar); return NULL; }
		fitem = PyNumber_Float(item);
		if (!fitem) { Py_DECREF(seq); free(dbar); return NULL; }
		dbar[i] = PyFloat_AS_DOUBLE(fitem);
		Py_DECREF(fitem);
	}

	Py_DECREF(seq);
	result = total(dbar, seqlen); /*call a C function using this array*/
	free(dbar);
	return Py_BuildValue("d", result);
}

I'd like to do the reverse: take an C array (say, with 100 elements)
and copy its elements into a Python list.  But I don't know where to
start...there's no PySequence_Fast_INSERT or even PySequence_Insert
function, for example.  Can I create an empty list in the API or
should I just pass one in from Python?

Can someone please help with this?  Thanks in advance!!

--Nick