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Three questions on the sizeof.patch:
1) In the first line of function dict_sizeof()
+	res = sizeof(PyDictObject) + sizeof(mp->ma_table);
is the sizeof(mp->ma_table) counted twice?
2) Since functions list_sizeof and dict_sizeof return the allocated 
size, including the over-allocation, should function string_sizeof not 
include the sentinel null character?
3) Are tuples left out on purpose? If not, here is an implementation 
for Objects/tupleobject.c:
....
static PyObject *
tuple_sizeof(PyTupleObject *v)
{
	Py_ssize_t res;
	res = _PyObject_SIZE(&PyTuple_Type) + Py_SIZE(v) * 
sizeof(void*);
	return PyInt_FromSsize_t(res);
}
PyDoc_STRVAR(sizeof_doc,
"T.__sizeof__() -- size of T in bytes");
....
static PyMethodDef tuple_methods[] = {
	{"__getnewargs__",	(PyCFunction)tuple_getnewargs,	
METH_NOARGS},
	{"__sizeof__", (PyCFunction)tuple_sizeof, METH_NOARGS, 
sizeof_doc},
....
/Jean Brouwers