January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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以 Python 的 C API 擴充 Python
|
755
欄位
tp_flags
是一個
long
，其位元決定了你型別結構（type struct）的
確切布局（layout），主要是為了回溯相容性。將此欄位設為
Py_TPFLAGS_
DEFAULT
來表示你正在定義一個正常的現代型別。如果你的型別支援環狀
廢物回收（cyclic garbage collection），就將
tp_flags
設為
Py_TPFLAGS_
DEFAULT|Py_TPFLAGS_HAVE_GC
。如果你型別的實體含有的
PyObject*
欄位可
能指向任意的物件並形成參考迴圈（reference loop）的一部分，那麼你的
型別就應該支援環狀廢物回收。要支援環狀廢物回收，新增
Py_TPFLAGS_
HAVE_GC
到欄位
tp_flags
是不夠的，你還必須提供適當的函式，由插
槽
tp_traverse
與
tp_clear
表示，並以環狀廢物回收器（cyclic garbage
collector）適當地註冊或註銷你的實體。支援環狀廢物回收是進階的主
題，我們不會在本書中進一步涵蓋，請參閱線上說明文件（
https://docs.
python.org/3/c-api/gcsupport.html
）。同樣地，我們也不涵蓋支援弱參考
（weak references）這種進階主題，線上說明文件已有涵蓋（
https://docs.
python.org/3/extending/newtypes.html#weakref-support
）。
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.