python / python/cpython

Cannot use ProcessPoolExecutor if in a decorator?

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3.7 (EOL) 3.8 (EOL) 3.9 (EOL) stdlib topic-multiprocessing type-bug
Dominant language
Python
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Description

BPO 41577
Nosy @pitrou, @avassalotti, @aeros

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 2020-08-18.17:21:46.050>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = 'Cannot use ProcessPoolExecutor if in a decorator?'
updated_at = <Date 2020-08-19.03:12:40.247>
user = 'https://bugs.python.org/bobfanglondon'

bugs.python.org fields:

activity = <Date 2020-08-19.03:12:40.247>
actor = 'aeros'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-08-18.17:21:46.050>
creator = 'bob.fang.london'
dependencies = []
files = []
hgrepos = []
issue_num = 41577
keywords = []
message_count = 2.0
messages = ['375614', '375632']
nosy_count = 4.0
nosy_names = ['pitrou', 'alexandre.vassalotti', 'aeros', 'bob.fang.london']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41577'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']

Contributor guide

Open the contributing guide

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 reading the migrated BPO 41577 discussion and the ProcessPoolExecutor documentation, then reproduce the reported decorator use case. Identify the relevant standard-library implementation and existing tests before determining what behavior should change; done requires a confirmed fix or a clear explanation backed by a regression 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
25/100

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