Type 对象
*********

PyTypeObject

   对象的 C 结构用于描述 built-in 类型。

PyObject* PyType_Type

   这是属于 type 对象的 type object，它在 Python 层面和 "type" 是相同
   的对象。

int PyType_Check(PyObject *o)

   如果对象 *o* 是一个类型对象，包括继承于标准类型对象的类型实例，返回
   真。在其它所有情况下返回假。

int PyType_CheckExact(PyObject *o)

   如果对象 *o* 是一个类型对象，但不是标准类型对象的子类型时，返回真。
   在其它所有情况下返回假。

unsigned int PyType_ClearCache()

   Clear the internal lookup cache. Return the current version tag.

unsigned long PyType_GetFlags(PyTypeObject* type)

   Return the "tp_flags" member of *type*. This function is primarily
   meant for use with *Py_LIMITED_API*; the individual flag bits are
   guaranteed to be stable across Python releases, but access to
   "tp_flags" itself is not part of the limited API.

   3.2 新版功能.

   在 3.4 版更改: The return type is now "unsigned long" rather than
   "long".

void PyType_Modified(PyTypeObject *type)

   Invalidate the internal lookup cache for the type and all of its
   subtypes.  This function must be called after any manual
   modification of the attributes or base classes of the type.

int PyType_HasFeature(PyTypeObject *o, int feature)

   Return true if the type object *o* sets the feature *feature*.
   Type features are denoted by single bit flags.

int PyType_IS_GC(PyTypeObject *o)

   Return true if the type object includes support for the cycle
   detector; this tests the type flag "Py_TPFLAGS_HAVE_GC".

int PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b)

   Return true if *a* is a subtype of *b*.

   This function only checks for actual subtypes, which means that
   "__subclasscheck__()" is not called on *b*.  Call
   "PyObject_IsSubclass()" to do the same check that "issubclass()"
   would do.

PyObject* PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems)
    *Return value: New reference.*

   Generic handler for the "tp_alloc" slot of a type object.  Use
   Python's default memory allocation mechanism to allocate a new
   instance and initialize all its contents to *NULL*.

PyObject* PyType_GenericNew(PyTypeObject *type, PyObject *args, PyObject *kwds)
    *Return value: New reference.*

   Generic handler for the "tp_new" slot of a type object.  Create a
   new instance using the type's "tp_alloc" slot.

int PyType_Ready(PyTypeObject *type)

   Finalize a type object.  This should be called on all type objects
   to finish their initialization.  This function is responsible for
   adding inherited slots from a type's base class.  Return "0" on
   success, or return "-1" and sets an exception on error.

void* PyType_GetSlot(PyTypeObject *type, int slot)

   Return the function pointer stored in the given slot. If the result
   is *NULL*, this indicates that either the slot is *NULL*, or that
   the function was called with invalid parameters. Callers will
   typically cast the result pointer into the appropriate function
   type.

   See "PyType_Slot.slot" for possible values of the *slot* argument.

   An exception is raised if *type* is not a heap type.

   3.4 新版功能.


Creating Heap-Allocated Types
=============================

The following functions and structs are used to create heap types.

PyObject* PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
    *Return value: New reference.*

   Creates and returns a heap type object from the *spec*
   ("Py_TPFLAGS_HEAPTYPE").

   If *bases* is a tuple, the created heap type contains all types
   contained in it as base types.

   If *bases* is *NULL*, the *Py_tp_base* slot is used instead. If
   that also is *NULL*, the new type derives from "object".

   This function calls "PyType_Ready()" on the new type.

   3.3 新版功能.

PyObject* PyType_FromSpec(PyType_Spec *spec)
    *Return value: New reference.*

   Equivalent to "PyType_FromSpecWithBases(spec, NULL)".

PyType_Spec

   Structure defining a type's behavior.

   const char* PyType_Spec.name

      Name of the type, used to set "PyTypeObject.tp_name".

   int PyType_Spec.basicsize

   int PyType_Spec.itemsize

      Size of the instance in bytes, used to set
      "PyTypeObject.tp_basicsize" and "PyTypeObject.tp_itemsize".

   int PyType_Spec.flags

      Type flags, used to set "PyTypeObject.tp_flags".

      If the "Py_TPFLAGS_HEAPTYPE" flag is not set,
      "PyType_FromSpecWithBases()" sets it automatically.

   PyType_Slot *PyType_Spec.slots

      Array of "PyType_Slot" structures. Terminated by the special
      slot value "{0, NULL}".

PyType_Slot

   Structure defining optional functionality of a type, containing a
   slot ID and a value pointer.

   int PyType_Slot.slot

      A slot ID.

      Slot IDs are named like the field names of the structures
      "PyTypeObject", "PyNumberMethods", "PySequenceMethods",
      "PyMappingMethods" and "PyAsyncMethods" with an added "Py_"
      prefix. For example, use:

      * "Py_tp_dealloc" to set "PyTypeObject.tp_dealloc"

      * "Py_nb_add" to set "PyNumberMethods.nb_add"

      * "Py_sq_length" to set "PySequenceMethods.sq_length"

      The following fields cannot be set using *PyType_Spec* and
      *PyType_Slot*:

      * "tp_dict"

      * "tp_mro"

      * "tp_cache"

      * "tp_subclasses"

      * "tp_weaklist"

      * "tp_print"

      * "tp_weaklistoffset"

      * "tp_dictoffset"

      * "bf_getbuffer"

      * "bf_releasebuffer"

      Setting "Py_tp_bases" may be problematic on some platforms. To
      avoid issues, use the *bases* argument of
      "PyType_FromSpecWithBases()" instead.

   void *PyType_Slot.pfunc

      The desired value of the slot. In most cases, this is a pointer
      to a function.

      May not be *NULL*.
