Sentinel objects
****************

PyTypeObject PySentinel_Type

   This instance of "PyTypeObject" represents the Python "sentinel"
   type.  This is the same object as "sentinel".

   在 3.15 版被加入.

int PySentinel_Check(PyObject *o)

   Return true if *o* is a "sentinel" object or a subtype. The
   "sentinel" type does not currently allow subclasses, so this check
   is exact. Future Python versions may choose to allow subtyping.
   This function always succeeds.

   在 3.15 版被加入.

int PySentinel_CheckExact(PyObject *o)

   Return true if *o* is a "sentinel" object, but not a subtype. The
   "sentinel" type does not currently allow subclasses. Future Python
   versions may choose to allow subtyping. This function always
   succeeds.

   在 3.15 版被加入.

PyObject *PySentinel_New(const char *name, const char *module_name)
    *回傳值：新的參照。*

   Return a new "sentinel" object with "__name__" set to *name* and
   "__module__" set to *module_name*. *name* must not be "NULL". If
   *module_name* is "NULL", "__module__" is set to "None". Return
   "NULL" with an exception set on failure.

   For pickling to work, *module_name* must be the name of an
   importable module, and the sentinel must be accessible from that
   module under a path matching *name*.  Pickle treats *name* as a
   global variable name in *module_name* (see "object.__reduce__()").

   在 3.15 版被加入.
