Reference cycles from a WeakKeyDictionary value to its key aren’t collected

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4/5
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新手友好度
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Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
python
领域
backend

调研方向

首先复现针对 WeakKeyDictionary 描述的引用循环行为，然后检查其标准库实现和现有测试。完整的修复应确保从值回到其键的循环能够被回收，同时不引入 WeakKeyDictionary 行为的回归。

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描述

3.12 stdlib type-bug
BPO 44680
Nosy @andersk

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-07-19.21:23:17.423>
labels = ['library', '3.9', 'performance']
title = 'Reference cycles from a WeakKeyDictionary value to its key aren\xe2\x80\x99t collected'
updated_at = <Date 2021-07-19.23:06:04.944>
user = 'https://github.com/andersk'

bugs.python.org fields:

activity = <Date 2021-07-19.23:06:04.944>
actor = 'andersk'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-07-19.21:23:17.423>
creator = 'andersk'
dependencies = []
files = []
hgrepos = []
issue_num = 44680
keywords = []
message_count = 2.0
messages = ['397841', '397845']
nosy_count = 1.0
nosy_names = ['andersk']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue44680'
versions = ['Python 3.9']

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