This document is for an old version of Python that is no longer supported. You should upgrade and read the Python 当前稳定版本的文档.

# Type Objects

`PyTypeObject`

  The C structure of the objects used to describe built-in types.

PyObject* `PyType_Type`

  This is the type object for type objects; it is the same object as `type` and `types.TypeType` in the Python layer.

int `PyType_Check`(PyObject *o)

  Return true if the object o is a type object, including instances of types derived from the standard type object. Return false in all other cases.

int `PyType_CheckExact`(PyObject *o)

  Return true if the object o is a type object, but not a subtype of the standard type object. Return false in all other cases.

  2.2 版新加入.

unsigned int `PyType_ClearCache`()

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

  2.6 版新加入.

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.

  2.6 版新加入.

int `PyType_HasFeature`(PyObject *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`(PyObject *o)

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

  2.0 版新加入.

int `PyType_IsSubtype`(PyTypeObject *a, PyTypeObject *b)

  Return true if a is a subtype of b.

  2.2 版新加入.

  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.

  2.2 版新加入.

  2.5 版更變: This function used an `int` type for nitems. This might require changes in your code for properly supporting 64-bit systems.

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

  2.2 版新加入.

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.

  2.2 版新加入.