很简单，定义个 PyTypeObject，注册到一个 module 中即可。
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#include <Python.h>
typedef struct {
PyObject_HEAD
} noddy_NoddyObject;
static PyTypeObject noddy_NoddyType = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"noddy.Noddy", /*tp_name*/
sizeof(noddy_NoddyObject), /*tp_basicsize*/
0, /*tp_itemsize*/
0, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"Noddy objects", /* tp_doc */
};
static PyMethodDef noddy_methods[] = {
{NULL} /* Sentinel */
};
PyMODINIT_FUNC
initnoddy(void)
{
PyObject *m;
noddy_NoddyType.tp_new = PyType_GenericNew;
if (PyType_Ready(&noddy_NoddyType) < 0)
return;
Py_INCREF(&noddy_NoddyType);
m = Py_InitModule3("noddy", noddy_methods, "example module");
PyModule_AddObject(m, "Noddy", (PyObject*)&noddy_NoddyType);
}
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>>> import noddy
>>> dir(noddy)
['Noddy', '__doc__', '__file__', '__name__', '__package__']
>>> noddy
<module 'noddy' from '...\noddy.pyd'>
>>> a = noddy.Noddy()
>>> a
<noddy.Noddy object at 0x00CB14F0>
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进阶：
1. 给自定义class增加attribute
2. 让自定义class支持cyclic gc (If we had written custom tp_alloc or tp_free slots, we'd need to modify them for cyclic-garbage collection)
参考：
Extending and Embedding the Python Interpreter => Defining New Types
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