defining class and subclass in C

[Daniel Franke]

Hi all.

I spent some days and nights on this already and my google-fu is running out.

I'd like to implement the equivalent of this Python code in a C-extension:
(<class '__main__.A'>,)

However, loading my C-code (quoted below) I get:
<type 'ca.ca'>

Here I'd expect "<class 'ca.ca'>" instead?! And I never managed a proper
subclass :|

The point of the excercise: with "ca" and "cb" properly implemented, I'd like
to subclass "cb" not from "ca", but from the Python "class A" - if possible?!

Could somepne kindly point out my mistake(s) and set me back on track?

Thanks

Daniel

--
#include <Python.h>

typedef struct {
PyObject_HEAD
} ca;

static PyTypeObject ca_Type = {
PyObject_HEAD_INIT(NULL)
};

PyMODINIT_FUNC initca(void) {
PyObject *ca;

ca_Type.tp_name = "ca.ca";
ca_Type.tp_basicsize = sizeof(ca);
ca_Type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;

if (PyType_Ready(&ca_Type) < 0)
return;

ca = Py_InitModule3("ca", NULL, "ca module");
if (ca == NULL)
return;

Py_INCREF(&ca_Type);
PyModule_AddObject(ca, "ca", (PyObject*)&ca_Type);
}

$ gcc -Wall -Wextra -g -fPIC -I/usr/include/python2.7 ca.c \
-shared -Wl,-soname,ca.so -o ca.so -lpython2.7