《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