isinstance raises TypeError for metaclass with metaclass=ABCMeta

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Assessment

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

Research direction

No source files or tests are named in the issue. Start by reading the BPO issue details and the discussion around PR #27648, then verify the expected isinstance behavior for a metaclass using ABCMeta; done means the reported TypeError is resolved and the relevant tests pass.

Written by the indexing model from the issue text.

Description

3.10 3.11 3.9 (EOL) interpreter-core type-bug
BPO 36881
Nosy @rhettinger, @ilevkivskyi, @cdonovick, @websurfer5, @emanspeaks, @myungsekyo, @iritkatriel
PRs
  • python/cpython#27648
    		•

    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 2019-05-11.02:29:04.594>
labels = ['interpreter-core', 'type-bug', '3.9', '3.10', '3.11']
title = 'isinstance raises TypeError for metaclass with metaclass=ABCMeta'
updated_at = <Date 2021-08-07.00:53:04.129>
user = 'https://github.com/emanspeaks'

    bugs.python.org fields:

    activity = <Date 2021-08-07.00:53:04.129>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2019-05-11.02:29:04.594>
creator = 'emanspeaks'
dependencies = []
files = []
hgrepos = []
issue_num = 36881
keywords = ['patch']
message_count = 3.0
messages = ['342152', '342870', '399162']
nosy_count = 8.0
nosy_names = ['rhettinger', 'stutzbach', 'levkivskyi', 'donovick', 'Jeffrey.Kintscher', 'emanspeaks', 'myungsekyo', 'iritkatriel']
pr_nums = ['27648']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36881'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

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