File: custom.c

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#define PY_SSIZE_T_CLEAN
#include <Python.h>

typedef struct {
    PyObject_HEAD
    /* Type-specific fields go here. */
} CustomObject;

static PyTypeObject CustomType = {
    .ob_base = PyVarObject_HEAD_INIT(NULL, 0)
    .tp_name = "custom.Custom",
    .tp_doc = PyDoc_STR("Custom objects"),
    .tp_basicsize = sizeof(CustomObject),
    .tp_itemsize = 0,
    .tp_flags = Py_TPFLAGS_DEFAULT,
    .tp_new = PyType_GenericNew,
};

static int
custom_module_exec(PyObject *m)
{
    if (PyType_Ready(&CustomType) < 0) {
        return -1;
    }

    if (PyModule_AddObjectRef(m, "Custom", (PyObject *) &CustomType) < 0) {
        return -1;
    }

    return 0;
}

static PyModuleDef_Slot custom_module_slots[] = {
    {Py_mod_exec, custom_module_exec},
    // Just use this while using static types
    {Py_mod_multiple_interpreters, Py_MOD_MULTIPLE_INTERPRETERS_NOT_SUPPORTED},
    {0, NULL}
};

static PyModuleDef custom_module = {
    .m_base = PyModuleDef_HEAD_INIT,
    .m_name = "custom",
    .m_doc = "Example module that creates an extension type.",
    .m_size = 0,
    .m_slots = custom_module_slots,
};

PyMODINIT_FUNC
PyInit_custom(void)
{
    return PyModuleDef_Init(&custom_module);
}