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# 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` 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.

unsigned int `PyType_ClearCache`()
  Clear the internal lookup cache. Return the current version tag.

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`(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`.

int `PyType_IsSubtype`(PyTypeObject *a, PyTypeObject *b)
  Return true if a is a subtype of b.

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

  XXX: Document.

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

  XXX: Document.

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.

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