This release introduces the new Ruff formatter 2024.2 style and adds a new lint rule to
detect invalid formatter suppression comments.
Changes
Preview features

[flake8-bandit] Remove suspicious-lxml-import (S410) (#10154)
[pycodestyle] Allow os.environ modifications between imports (E402) (#10066)
[pycodestyle] Don't warn about a single whitespace character before a comma in a tuple (E203) (#10094)

Rule changes

[eradicate] Detect commented out case statements (ERA001) (#10055)
[eradicate] Detect single-line code for try:, except:, etc. (ERA001) (#10057)
[flake8-boolean-trap] Allow boolean positionals in __post_init__ (#10027)
[flake8-copyright] Allow © in copyright notices (#10065)
[isort]: Use one blank line after imports in typing stub files (#9971)
[pylint] New Rule dict-iter-missing-items (PLE1141) (#9845)
[pylint] Ignore sys.version and sys.platform (PLR1714) (#10054)
[pyupgrade] Detect literals with unary operators (UP018) (#10060)
[ruff] Expand rule for list(iterable).pop(0) idiom (RUF015) (#10148)

Formatter
This release introduces the Ruff 2024.2 style, stabilizing the following changes:

Prefer splitting the assignment's value over the target or type annotation (#8943)
Remove blank lines before class docstrings (#9154)
Wrap multiple context managers in with parentheses when targeting Python 3.9 or newer (#9222)
Add a blank line after nested classes with a dummy body (...) in typing stub files (#9155)
Reduce vertical spacing for classes and functions with a dummy (...) body (#7440, #9240)
Add a blank line after the module docstring (#8283)
Parenthesize long type hints in assignments (#9210)
Preserve indent for single multiline-string call-expressions (#9673)
Normalize hex escape and unicode escape sequences (#9280)
Format module docstrings (#9725)

CLI

Explicitly disallow extend as part of a --config flag (#10135)
Remove build from the default exclusion list (#10093)
Deprecate ruff <path>, ruff --explain, ruff --clean, and ruff --generate-shell-completion in favor of ruff check <path>, ruff rule, ruff clean, and ruff generate-shell-completion (#10169)
Remove the deprecated CLI option --format from ruff rule and ruff linter (#10170)

Bug fixes

[flake8-bugbear] Avoid adding default initializers to stubs (B006) (#10152)
[flake8-type-checking] Respect runtime-required decorators for function signatures (#10091)
[pycodestyle] Mark fixes overlapping with a multiline string as unsafe (W293) (#10049)
[pydocstyle] Trim whitespace when removing blank lines after section (D413) (#10162)
[pylint] Delete entire statement, including semicolons (PLR0203) (#10074)
[ruff] Avoid f-string false positives in gettext calls (RUF027) (#10118)
Fix ruff crashing on PowerPC systems because of too small page size (#10080)

Performance

Add cold attribute to less likely printer queue branches in the formatter (#10121)
Skip unnecessary string normalization in the formatter (#10116)

Documentation

Remove "Beta" Label from formatter documentation (#10144)
line-length option: fix link to pycodestyle.max-line-length (#10136)

Contributors

@AlexWaygood
@DanielNoord
@MichaReiser
@Philipp-Thiel
@arjunnn
@arkinmodi
@boidolr
@charliermarsh
@hoel-bagard
@jusexton
@omh1280
@robincaloudis
@sanxiyn
@snowsignal
@ternaus