isinstance accepts subtypes of tuples as second argument
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3.9 (EOL)
interpreter-core
type-bug
- Dominant language
- Python
- Stars
- 77.2k
- Forks
- 36k
- PR merge metrics
- PR metrics pending
Description
| BPO | 39550 |
|---|---|
| Nosy | @vstinner, @serhiy-storchaka, @pganssle, @ewjoachim |
| Files |
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 2020-02-04.18:30:00.188>
labels = ['type-bug', '3.9']
title = 'isinstance accepts subtypes of tuples as second argument'
updated_at = <Date 2020-02-04.21:31:43.493>
user = 'https://github.com/ewjoachim'
bugs.python.org fields:
activity = <Date 2020-02-04.21:31:43.493>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-02-04.18:30:00.188>
creator = 'ewjoachim'
dependencies = []
files = ['48884']
hgrepos = []
issue_num = 39550
keywords = []
message_count = 4.0
messages = ['361362', '361363', '361365', '361371']
nosy_count = 4.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'p-ganssle', 'ewjoachim']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39550'
versions = ['Python 3.9']
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading and running the attached isinstance_iter.py reproducer, then inspect the issue discussion and the CPython implementation of isinstance. Determine the intended behavior for tuple subtypes as the second argument and verify that the observed behavior is corrected without breaking existing isinstance cases.
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