《CPython Internals》阅读笔记：p285-p328

《CPython Internals》学习第 15天，p285-p328 总结，总计 44 页。

一、技术总结

1.shallow comparison

p285, In Objects object.c, the base implementation of the object type is written in pure C code. There are some concrete implementations of basic logic, like shallow comparisons(《CPython Internals》第285页)。

shallow 和 deep这两个词常见于 copy(shallow copy, deep copy) 和 comparison(shallow comparison, deep comparison) 操作中。

但是个人觉得从字面意思不好理解。示例：TBD。

2.dunder method

All these functions can be overridden in a custom object by implementing dunder methods on a Python object(《CPython Internals》第286页)。

看到 dunder methods, 一下子没反应过来什么样的方法叫 dunder methods, dunder 是什么意思?查了下，dunder是 double under的缩写，其实是为了发音(pronunce)方便, 由 Mark Jackson提出：

An awkward thing about programming in Python: there are lots of double underscores. [snip] My problem with the double underscore is that it's hard to say. How do you pronounce init__? "underscore underscore init underscore underscore"? "under under init under under"? Just plain "init" seems to leave out something important. I have a solution: double underscore should be pronounced "dunder". So __init is "dunder init dunder", or just "dunder init".

dunder method 也称为 magic method 或者 special method。

二、英语总结(生词：2)

无。

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。

三、其它

无。

四、参考资料

1. 编程

(1) Anthony Shaw，《CPython Internals》：https://book.douban.com/subject/35405785/

2. 英语

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

欢迎搜索及关注：编程人(a_codists)