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 A(object):
... pass
>>> class B(A):
... pass
>>> A
<class '__main__.A'>
>>> B
<class '__main__.B'>
>>> B.__bases__
(<class '__main__.A'>,)
However, loading my C-code (quoted below) I get:
>>> import ca
>>> ca
<module 'ca' from 'ca.so'>
>>> ca.ca
<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
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