为什么weakref 不支持Python 中的内置类型? [英] Why weakref doesn't support built-in types in Python?

问题描述

在 Python 弱引用文档中(http://docs.python.org/library/weakref.html )，它说

In Python weakref document( http://docs.python.org/library/weakref.html ), it says that

list、dict等几种内置类型不直接支持弱引用但可以通过子类化添加支持

Several built-in types such as list and dict do not directly support weak references but can add support through subclassing

我认为为 big dict 创建 weakref 在某些实际情况下可能很有用.我想知道该实施背后的原因是什么?

I think creating weakref for big dict could be useful in some real cases. I'm wondering what's the reason behind that implementation ?

推荐答案

大多数内置类型都不是直接弱引用的(例如 str、int、float、list、dict、None)，还有一些甚至不能通过子类化(例如 CPython 中的元组)来实现.

Most of the built-in types are not directly weak referenceable (e.g. str, int, float, list, dict, None), and there are a few that cannot even be made so by sub-classing (e.g. tuples in CPython).

可以在 Raymond Hettinger 于 2005 年 3 月发布的 Python 列表帖子.

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