对象实现支持
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本章描述了定义新对象类型时所使用的函数、类型和宏。

* 在堆中分配对象

* Common Object Structures

  * Base object types and macros

  * Implementing functions and methods

  * Accessing attributes of extension types

* Type 对象

  * 快速参考

    * "tp 槽"

    * sub-slots

    * slot typedefs

  * PyTypeObject Definition

  * PyObject Slots

  * PyVarObject Slots

  * PyTypeObject Slots

  * Heap Types

* Number Object Structures

* Mapping Object Structures

* Sequence Object Structures

* Buffer Object Structures

* Async Object Structures

* Slot Type typedefs

* 例子

* 使对象类型支持循环垃圾回收
