# `None` 物件

Note that the `PyTypeObject` for `None` is not directly exposed in the Python/C API. Since `None` is a singleton, testing for object identity (using `==` in C) is sufficient. There is no `PyNone_Check()` function for the same reason.

PyObject *Py_None

  The Python `None` object, denoting lack of value. This object has no methods and is immortal.

在 3.12 版的變更: `Py_None` 為不滅的 (immortal)。

Py_RETURN_NONE

  Return `Py_None` from a function.