python / python/cpython

Subclassing of annotated types does not always work

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3.13 3.14 3.15 3.16 3.9 (EOL) stdlib topic-typing type-bug
Dominant language
Python
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Forks
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PR merge metrics
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Description

BPO 44969
Nosy @gvanrossum, @serhiy-storchaka, @Fidget-Spinner

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 2021-08-21.07:41:02.034>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'Subclassing of annotated types does not always work'
updated_at = <Date 2021-08-21.07:47:25.292>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2021-08-21.07:47:25.292>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-08-21.07:41:02.034>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 44969
keywords = []
message_count = 2.0
messages = ['400021', '400022']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'serhiy.storchaka', 'kj']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44969'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

Linked PRs
  • gh-155360

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing linked PR gh-155360, because the issue body names no file, entry point, or test. The issue is done when the reported subclassing behavior for annotated types works consistently and the linked work provides adequate verification.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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