python / python/cpython

make function parameter sentinel value true singletons

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3.11 stdlib type-feature
Dominant language
Python
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Merged PRs (30d)
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Description

BPO 44123
Nosy @rhettinger, @vstinner, @taleinat, @ericvsmith, @zware, @serhiy-storchaka, @iritkatriel

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 2021-05-13.13:17:06.374>
labels = ['type-feature', 'library', '3.11']
title = 'make function parameter sentinel value true singletons'
updated_at = <Date 2021-05-15.19:23:47.412>
user = 'https://github.com/taleinat'

bugs.python.org fields:

activity = <Date 2021-05-15.19:23:47.412>
actor = 'taleinat'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-05-13.13:17:06.374>
creator = 'taleinat'
dependencies = []
files = []
hgrepos = []
issue_num = 44123
keywords = []
message_count = 13.0
messages = ['393580', '393581', '393582', '393590', '393594', '393606', '393627', '393628', '393632', '393634', '393674', '393680', '393724']
nosy_count = 7.0
nosy_names = ['rhettinger', 'vstinner', 'taleinat', 'eric.smith', 'zach.ware', 'serhiy.storchaka', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue44123'
versions = ['Python 3.11']

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 linked BPO issue 44123 and its migrated discussion; the payload names no source files, tests, or entry points. Clarify the intended singleton behavior for function-parameter sentinel values, then identify the affected library code and tests. Done means the specified sentinel values behave as true singletons with coverage for the intended cases.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
api
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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