Issues

• B042 has naive definition of exception

  PyCQA/flake8-bugbear#538 · Filter by author GPHemsley-RELX opened on Feb 13, 2026
  2

• Proposed rules: encourage use of re.compile on constants in module scope, forbid it in function scope

  PyCQA/flake8-bugbear#536 · Filter by author sirosen opened on Jan 7, 2026

• Proposed warning: assert <generator_expression>

  PyCQA/flake8-bugbear#534 · Filter by author gschaffner opened on Dec 17, 2025
  3

• Warn on unnecessary use of global

  PyCQA/flake8-bugbear#492 · Filter by author Zac-HD opened on Sep 17, 2024
  3

• Type annotate code via mypy (strict) typechecking all flake8-bugbear code

  enhancementhelp wanted
  PyCQA/flake8-bugbear#478 · Filter by author cooperlees opened on Jun 24, 2024
  4

• B909 has several false positives on black codebase

  PyCQA/flake8-bugbear#467 · Filter by author hauntsaninja opened on Apr 22, 2024
  7

• B909 improvements

  PyCQA/flake8-bugbear#454 · Filter by author mimre25 opened on Jan 17, 2024
  4

• B018 doesn't trigger for useless expressions involving multiple variables

  bughelp wanted
  PyCQA/flake8-bugbear#452 · Filter by author swierh opened on Jan 16, 2024
  3

• Couple new rule suggestions

  enhancementhelp wanted
  PyCQA/flake8-bugbear#440 · Filter by author r-downing opened on Dec 17, 2023
  2

• Feature request: a rule for detecting calls to mutate all-caps "constants"

  PyCQA/flake8-bugbear#423 · Filter by author drew-gill opened on Nov 22, 2023
  1

• Policy on bugbears in usage of popular third party libraries

  help wantedquestion
  PyCQA/flake8-bugbear#414 · Filter by author Daverball opened on Sep 19, 2023
  2

• False positive B023 with loop's local variable

  PyCQA/flake8-bugbear#402 · Filter by author jamesbraza opened on Jul 18, 2023
  3

• B023: Why flake8 returns error only for a temporal variable for for loop?

  PyCQA/flake8-bugbear#396 · Filter by author monagai opened on Jun 29, 2023
  8

• Warn about dict.fromkeys(keys, mutable)

  PyCQA/flake8-bugbear#387 · Filter by author janosh opened on May 28, 2023

• New check: duplicate types in type hint, or duplicate literals in set

  enhancementhelp wanted
  PyCQA/flake8-bugbear#371 · Filter by author jakkdl opened on Mar 21, 2023
  5

• B006: ignore when type hints suggests immutability.

  PyCQA/flake8-bugbear#362 · Filter by author randolf-scholz opened on Mar 2, 2023
  4

• Proposed warning: reuse of loop variable in nested loop

  PyCQA/flake8-bugbear#360 · Filter by author matthewlloyd opened on Feb 16, 2023
  4

• B906 checks all classes, not just AST visitors

  PyCQA/flake8-bugbear#359 · Filter by author samueljsb opened on Feb 16, 2023

• Implement import tracking

  PyCQA/flake8-bugbear#357 · Filter by author FozzieHi opened on Feb 15, 2023
  4

• B031 flagged on non-itertools groupby

  enhancementhelp wanted
  PyCQA/flake8-bugbear#356 · Filter by author eachimei opened on Feb 15, 2023
  3

• Report on uncatchable exception handlers (?)

  enhancementhelp wanted
  PyCQA/flake8-bugbear#349 · Filter by author jakkdl opened on Feb 7, 2023
  3

• Question: B027 empty method in an abstract base class

  PyCQA/flake8-bugbear#301 · Filter by author yannikschaelte opened on Oct 25, 2022
  3

• B950 ignores max-doc-length flake8 configuration option

  enhancementhelp wanted
  PyCQA/flake8-bugbear#285 · Filter by author SRv6d opened on Sep 18, 2022
  3

• Enforce order of decorators combined with @abstractmethod

  enhancementhelp wanted
  PyCQA/flake8-bugbear#279 · Filter by author ghost opened on Aug 26, 2022
  1

• New rule to catch multidimensional array multiplication

  PyCQA/flake8-bugbear#271 · Filter by author wyuenho opened on Jul 13, 2022
  1