`extend-ignore` and `extend-select` options seem to be ignored

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1,116 stars (1,116 stars)

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Avg merge 4h 17m (Avg merge 4h 17m)3 merged PRs in 30d (3 merged PRs in 30d)

Description

▹ flake8 --select=E,B950  longline.py
longline.py:1:80: E501 line too long (109 > 79 characters)
longline.py:1:110: B950 line too long (109 > 79 characters)

▹ flake8 --select=E,B950 --ignore=E501 longline.py
longline.py:1:110: B950 line too long (109 > 79 characters)

▹ flake8 --extend-select=E,B950 longline.py
longline.py:1:80: E501 line too long (109 > 79 characters)

▹ flake8 --extend-select=E,B950 --ignore=E501 longline.py

▸ flake8 --select=E,B950 --extend-ignore=E501 longline.py

▸ flake8 --version
4.0.1 (flake8-bugbear: 22.1.11, mccabe: 0.6.1, pycodestyle: 2.8.0,
pyflakes: 2.4.0) CPython 3.10.1 on Linux

Contributor guide

Research direction

Investigate how flake8 handles extend select and extend ignore options in relation to B950. Trace the code path where these options are parsed and applied to the selected/ignored rules. Look at the interaction between extend select and ignore, and how extend ignore affects select. Consider that B950 may not be properly included or excluded due to the extend logic.

Tech stack

python

Domain

developer experiencetooling

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

PythonGit

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

75