1  #define PY_SSIZE_T_CLEAN
       2  #include <Python.h>
       3  
       4  typedef struct {
       5      PyObject_HEAD
       6      /* Type-specific fields go here. */
       7  } CustomObject;
       8  
       9  static PyTypeObject CustomType = {
      10      PyVarObject_HEAD_INIT(NULL, 0)
      11      .tp_name = "custom.Custom",
      12      .tp_doc = PyDoc_STR("Custom objects"),
      13      .tp_basicsize = sizeof(CustomObject),
      14      .tp_itemsize = 0,
      15      .tp_flags = Py_TPFLAGS_DEFAULT,
      16      .tp_new = PyType_GenericNew,
      17  };
      18  
      19  static PyModuleDef custommodule = {
      20      PyModuleDef_HEAD_INIT,
      21      .m_name = "custom",
      22      .m_doc = "Example module that creates an extension type.",
      23      .m_size = -1,
      24  };
      25  
      26  PyMODINIT_FUNC
      27  PyInit_custom(void)
      28  {
      29      PyObject *m;
      30      if (PyType_Ready(&CustomType) < 0)
      31          return NULL;
      32  
      33      m = PyModule_Create(&custommodule);
      34      if (m == NULL)
      35          return NULL;
      36  
      37      Py_INCREF(&CustomType);
      38      if (PyModule_AddObject(m, "Custom", (PyObject *) &CustomType) < 0) {
      39          Py_DECREF(&CustomType);
      40          Py_DECREF(m);
      41          return NULL;
      42      }
      43  
      44      return m;
      45  }