python / python/cpython

Can't reassign __class__ despite the assigned class having identical slots

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3.7 (EOL) interpreter-core
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Python
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Description

BPO 35048
Nosy @rhettinger, @mdickinson, @pitrou, @benjaminp, @serhiy-storchaka, @srinivasreddy, @mr-nfamous, @tirkarthi

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 2018-10-23.10:07:18.332>
labels = ['3.7']
title = "Can't reassign __class__ despite the assigned class having identical slots"
updated_at = <Date 2019-12-07.18:56:57.071>
user = 'https://github.com/mr-nfamous'

bugs.python.org fields:

activity = <Date 2019-12-07.18:56:57.071>
actor = 'rhettinger'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2018-10-23.10:07:18.332>
creator = 'bup'
dependencies = []
files = []
hgrepos = []
issue_num = 35048
keywords = []
message_count = 2.0
messages = ['328296', '357983']
nosy_count = 9.0
nosy_names = ['rhettinger', 'mark.dickinson', 'pitrou', 'benjamin.peterson', 'serhiy.storchaka', 'thatiparthy', 'bup', 'xtreak', 'Sterling Smith']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue35048'
versions = ['Python 3.7']

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

The issue names no implementation files or tests. Start by reproducing the reported class reassignment failure with classes having identical slots, then trace the relevant CPython behavior and existing regression tests. Done means the intended reassignment works for compatible classes and the behavior is covered by a focused test.

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
35/100

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