python / python/cpython

unittest overrides more serious warnings filter added before unittest.main()

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3.10 3.8 (EOL) 3.9 (EOL) stdlib type-bug
Dominant language
Python
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Description

BPO 42186
Nosy @terryjreedy, @ncoghlan, @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 2020-10-28.20:42:28.565>
labels = ['3.8', 'type-bug', 'library', '3.9', '3.10']
title = 'unittest overrides more serious warnings filter added before unittest.main()'
updated_at = <Date 2020-10-31.21:14:17.225>
user = 'https://bugs.python.org/yileinotused'

bugs.python.org fields:

activity = <Date 2020-10-31.21:14:17.225>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-10-28.20:42:28.565>
creator = 'yilei_not_used'
dependencies = []
files = []
hgrepos = []
issue_num = 42186
keywords = []
message_count = 4.0
messages = ['379843', '379850', '380016', '380039']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'ncoghlan', 'xtreak', 'yilei_not_used']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42186'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

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

Start at unittest.main() and trace how it configures warnings filters relative to filters added before it runs. The issue names no source file or test, so first reproduce the reported override and identify the relevant unittest library code. Done means a more serious pre-existing warnings filter is preserved, with regression coverage for that behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
testing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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