Assigning and deleting __new__ attr on the class does not allow to create instances of this class

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#69,917 11 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Quiet
Tech stack
python
Domain
compilers

Research direction

Start by reproducing the behavior from the attached new_patch_fails.py file on the affected Python versions, comparing Python 2.7 with Python 3.5 as described. Then trace the interpreter-core handling of assigning and deleting a class's new attribute. Done means the reported class can be instantiated after that sequence without the TypeError, with regression coverage for the behavior.

Written by the indexing model from the issue text.

Description

3.10 3.8 (EOL) 3.9 (EOL) interpreter-core type-bug
BPO 25731
Nosy @Yhg1s, @benjaminp, @eryksun, @skonieczny
Files
  • new_patch_fails.py: Attached file works on python 2.7, but fails on python3.5 with TypeError: object() takes no parameters.
    		•

    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 2015-11-25.12:29:50.304>
labels = ['interpreter-core', 'type-bug', '3.8', '3.9', '3.10']
title = 'Assigning and deleting __new__ attr on the class does not allow to create instances of this class'
updated_at = <Date 2021-03-05.12:14:47.716>
user = 'https://github.com/skonieczny'

    bugs.python.org fields:

    activity = <Date 2021-03-05.12:14:47.716>
actor = 'eryksun'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2015-11-25.12:29:50.304>
creator = 'uosiu'
dependencies = []
files = ['41161']
hgrepos = []
issue_num = 25731
keywords = []
message_count = 10.0
messages = ['255337', '255371', '258530', '258572', '262922', '263580', '263816', '266574', '266576', '278962']
nosy_count = 8.0
nosy_names = ['twouters', 'benjamin.peterson', 'python-dev', 'bkabrda', 'eryksun', 'uosiu', 'jcristau', 'Carl Dunham']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25731'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

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