Changelog

0.4.4

Preview features

[pycodestyle] Ignore end-of-line comments when determining blank line rules (#11342)
[pylint] Detect pathlib.Path.open calls in unspecified-encoding (PLW1514) (#11288)
[flake8-pyi] Implement PYI059 (generic-not-last-base-class) (#11233)
[flake8-pyi] Implement PYI062 (duplicate-literal-member) (#11269)

Rule changes

[flake8-boolean-trap] Allow passing booleans as positional-only arguments in code such as set(True) (#11287)
[flake8-bugbear] Ignore enum classes in cached-instance-method (B019) (#11312)

Server

Expand tildes when resolving Ruff server configuration file (#11283)
Fix ruff server hanging after Neovim closes (#11291)
Editor settings are used by default if no file-based configuration exists (#11266)

Bug fixes

[pylint] Consider with statements for too-many-branches (PLR0912) (#11321)
[flake8-blind-except, tryceratops] Respect logged and re-raised expressions in nested statements (BLE001, TRY201) (#11301)
Recognise assignments such as __all__ = builtins.list(["foo", "bar"]) as valid __all__ definitions (#11335)

0.4.3

Enhancements

Add support for PEP 696 syntax (#11120)

Preview features

[refurb] Use function range for reimplemented-operator diagnostics (#11271)
[refurb] Ignore methods in reimplemented-operator (FURB118) (#11270)
[refurb] Implement fstring-number-format (FURB116) (#10921)
[ruff] Implement redirected-noqa (RUF101) (#11052)
[pyflakes] Distinguish between first-party and third-party imports for fix suggestions (#11168)

Rule changes

[flake8-bugbear] Ignore non-abstract class attributes when enforcing B024 (#11210)
[flake8-logging] Include inline instantiations when detecting loggers (#11154)
[pylint] Also emit PLR0206 for properties with variadic parameters (#11200)
[ruff] Detect duplicate codes as part of unused-noqa (RUF100) (#10850)

Formatter

Avoid multiline expression if format specifier is present (#11123)

LSP

Write ruff server setup guide for Helix (#11183)
ruff server no longer hangs after shutdown (#11222)
ruff server reads from a configuration TOML file in the user configuration directory if no local configuration exists (#11225)
ruff server respects per-file-ignores configuration (#11224)
ruff server: Support a custom TOML configuration file (#11140)
ruff server: Support setting to prioritize project configuration over editor configuration (#11086)

Bug fixes

Avoid debug assertion around NFKC renames (#11249)
[pyflakes] Prioritize redefined-while-unused over unused-import (#11173)
[ruff] Respect async expressions in comprehension bodies (#11219)
[pygrep_hooks] Fix blanket-noqa panic when last line has noqa with no newline (PGH004) (#11108)
[perflint] Ignore list-copy recommendations for async for loops (#11250)
[pyflakes] Improve invalid-print-syntax documentation (#11171)

Performance

Avoid allocations for isort module names (#11251)
Build a separate ARM wheel for macOS (#11149)

0.4.2

Rule changes

[flake8-pyi] Allow for overloaded __exit__ and __aexit__ definitions (PYI036) (#11057)
[pyupgrade] Catch usages of "%s" % var and provide an unsafe fix (UP031) (#11019)
[refurb] Implement new rule that suggests min/max over sorted() (FURB192) (#10868)

Server

Fix an issue with missing diagnostics for Neovim and Helix (#11092)
Implement hover documentation for noqa codes (#11096)
Introduce common Ruff configuration options with new server settings (#11062)

Bug fixes

Use macos-12 for building release wheels to enable macOS 11 compatibility (#11146)
[flake8-blind-expect] Allow raise from in BLE001 (#11131)
[flake8-pyi] Allow simple assignments to None in enum class scopes (PYI026) (#11128)
[flake8-simplify] Avoid raising SIM911 for non-zip attribute calls (#11126)
[refurb] Avoid operator.itemgetter suggestion for single-item tuple (#11095)
[ruff] Respect per-file-ignores for RUF100 with no other diagnostics (#11058)
[ruff] Fix async comprehension false positive (RUF029) (#11070)

Documentation

[flake8-bugbear] Document explicitly disabling strict zip (B905) (#11040)
[flake8-type-checking] Mention lint.typing-modules in TCH001, TCH002, and TCH003 (#11144)
[isort] Improve documentation around custom isort sections (#11050)
[pylint] Fix documentation oversight for invalid-X-returns (#11094)

Performance

Use matchit to resolve per-file settings (#11111)

0.4.1

Preview features

[pylint] Implement invalid-hash-returned (PLE0309) (#10961)
[pylint] Implement invalid-index-returned (PLE0305) (#10962)

Bug fixes

[pylint] Allow NoReturn-like functions for __str__, __len__, etc. (PLE0307) (#11017)
Parser: Use empty range when there's "gap" in token source (#11032)
[ruff] Ignore stub functions in unused-async (RUF029) (#11026)
Parser: Expect indented case block instead of match stmt (#11033)

0.4.0

A new, hand-written parser

Ruff's new parser is >2x faster, which translates to a 20-40% speedup for all linting and formatting invocations. There's a lot to say about this exciting change, so check out the blog post for more details!

See #10036 for implementation details.

A new language server in Rust

With this release, we also want to highlight our new language server. ruff server is a Rust-powered language server that comes built-in with Ruff. It can be used with any editor that supports the Language Server Protocol (LSP). It uses a multi-threaded, lock-free architecture inspired by rust-analyzer and it will open the door for a lot of exciting features. It’s also faster than our previous Python-based language server -- but you probably guessed that already.

ruff server is only in alpha, but it has a lot of features that you can try out today:

Lints Python files automatically and shows quick-fixes when available
Formats Python files, with support for range formatting
Comes with commands for quickly performing actions: ruff.applyAutofix, ruff.applyFormat, and ruff.applyOrganizeImports
Supports source.fixAll and source.organizeImports source actions
Automatically reloads your project configuration when you change it

To setup ruff server with your editor, refer to the README.md.

Preview features

[pycodestyle] Do not trigger E3 rules on defs following a function/method with a dummy body (#10704)
[pylint] Implement invalid-bytes-returned (E0308) (#10959)
[pylint] Implement invalid-length-returned (E0303) (#10963)
[pylint] Implement self-cls-assignment (W0642) (#9267)
[pylint] Omit stubs from invalid-bool and invalid-str-return-type (#11008)
[ruff] New rule unused-async (RUF029) to detect unneeded async keywords on functions (#9966)

Rule changes

[flake8-bandit] Allow urllib.request.urlopen calls with static Request argument (S310) (#10964)
[flake8-bugbear] Treat raise NotImplemented-only bodies as stub functions (B006) (#10990)
[flake8-slots] Respect same-file Enum subclasses (SLOT000) (#11006)
[pylint] Support inverted comparisons (PLR1730) (#10920)

Linter

Improve handling of builtin symbols in linter rules (#10919)
Improve display of rules in --show-settings (#11003)
Improve inference capabilities of the BuiltinTypeChecker (#10976)
Resolve classes and functions relative to script name (#10965)
Improve performance of RuleTable::any_enabled (#10971)

Server

This section is devoted to updates for our new language server, written in Rust.

Enable ruff-specific source actions (#10916)
Refreshes diagnostics for open files when file configuration is changed (#10988)
Important errors are now shown as popups (#10951)
Introduce settings for directly configuring the linter and formatter (#10984)
Resolve configuration for each document individually (#10950)
Write a setup guide for Neovim (#10987)

Configuration

Add RUFF_OUTPUT_FILE environment variable support (#10992)

Bug fixes

Avoid non-augmented-assignment for reversed, non-commutative operators (PLR6104) (#10909)
Limit commutative non-augmented-assignments to primitive data types (PLR6104) (#10912)
Respect per-file-ignores for RUF100 on blanket # noqa (#10908)
Consider if expression for parenthesized with items parsing (#11010)
Consider binary expr for parenthesized with items parsing (#11012)
Reset FOR_TARGET context for all kinds of parentheses (#11009)

0.3.7

Preview features

[flake8-bugbear] Implement loop-iterator-mutation (B909) (#9578)
[pylint] Implement rule to prefer augmented assignment (PLR6104) (#9932)

Bug fixes

Avoid TOCTOU errors in cache initialization (#10884)
[pylint] Recode nan-comparison rule to W0177 (#10894)
[pylint] Reverse min-max logic in if-stmt-min-max (#10890)

0.3.6

Preview features

[pylint] Implement bad-staticmethod-argument (PLW0211) (#10781)
[pylint] Implement if-stmt-min-max (PLR1730, PLR1731) (#10002)
[pyupgrade] Replace str,Enum multiple inheritance with StrEnum UP042 (#10713)
[refurb] Implement if-expr-instead-of-or-operator (FURB110) (#10687)
[refurb] Implement int-on-sliced-str (FURB166) (#10650)
[refurb] Implement write-whole-file (FURB103) (#10802)
[refurb] Support itemgetter in reimplemented-operator (FURB118) (#10526)
[flake8_comprehensions] Add sum/min/max to unnecessary comprehension check (C419) (#10759)

Rule changes

[pydocstyle] Require capitalizing docstrings where the first sentence is a single word (D403) (#10776)
[pycodestyle] Ignore annotated lambdas in class scopes (E731) (#10720)
[flake8-pyi] Various improvements to PYI034 (#10807)
[flake8-slots] Flag subclasses of call-based typing.NamedTuples as well as subclasses of collections.namedtuple() (SLOT002) (#10808)
[pyflakes] Allow forward references in class bases in stub files (F821) (#10779)
[pygrep-hooks] Improve blanket-noqa error message (PGH004) (#10851)

CLI

Support FORCE_COLOR env var (#10839)

Configuration

Support negated patterns in [extend-]per-file-ignores (#10852)

Bug fixes

[flake8-import-conventions] Accept non-aliased (but correct) import in unconventional-import-alias (ICN001) (#10729)
[flake8-quotes] Add semantic model flag when inside f-string replacement field (#10766)
[pep8-naming] Recursively resolve TypeDicts for N815 violations (#10719)
[flake8-quotes] Respect Q00* ignores in flake8-quotes rules (#10728)
[flake8-simplify] Show negated condition in needless-bool diagnostics (SIM103) (#10854)
[ruff] Use within-scope shadowed bindings in asyncio-dangling-task (RUF006) (#10793)
[flake8-pytest-style] Fix single-tuple conversion in pytest-parametrize-values-wrong-type (PT007) (#10862)
[flake8-return] Ignore assignments to annotated variables in unnecessary-assign (RET504) (#10741)
[refurb] Do not allow any keyword arguments for read-whole-file in rb mode (FURB101) (#10803)
[pylint] Don't recommend decorating staticmethods with @singledispatch (PLE1519, PLE1520) (#10637)
[pydocstyle] Use section name range for all section-related docstring diagnostics (#10740)
Respect # noqa directives on __all__ openers (#10798)

0.3.5

Preview features

[pylint] Implement modified-iterating-set (E4703) (#10473)
[refurb] Implement for-loop-set-mutations (FURB142) (#10583)
[refurb] Implement unnecessary-from-float (FURB164) (#10647)
[refurb] Implement verbose-decimal-constructor (FURB157) (#10533)

Rule changes

[flake8-comprehensions] Handled special case for C401 which also matches C416 (#10596)
[flake8-pyi] Mark unaliased-collections-abc-set-import fix as "safe" for more cases in stub files (PYI025) (#10547)
[numpy] Add row_stack to NumPy 2.0 migration rule (#10646)
[pycodestyle] Allow cell magics before an import (E402) (#10545)
[pycodestyle] Avoid blank line rules for the first logical line in cell (#10291)

Configuration

Respected nested namespace packages (#10541)
[flake8-boolean-trap] Add setting for user defined allowed boolean trap (#10531)

Bug fixes

Correctly handle references in __all__ definitions when renaming symbols in autofixes (#10527)
Track ranges of names inside __all__ definitions (#10525)
[flake8-bugbear] Avoid false positive for usage after continue (B031) (#10539)
[flake8-copyright] Accept commas in default copyright pattern (#9498)
[flake8-datetimez] Allow f-strings with %z for DTZ007 (#10651)
[flake8-pytest-style] Fix PT014 autofix for last item in list (#10532)
[flake8-quotes] Ignore Q000, Q001 when string is inside forward ref (#10585)
[isort] Always place non-relative imports after relative imports (#10669)
[isort] Respect Unicode characters in import sorting (#10529)
[pyflakes] Fix F821 false negatives when from __future__ import annotations is active (attempt 2) (#10524)
[pyflakes] Make unnecessary-lambda an always-unsafe fix (#10668)
[pylint] Fixed false-positive on the rule PLW1641 (eq-without-hash) (#10566)
[ruff] Fix panic in unused # noqa removal with multi-byte space (RUF100) (#10682)

Documentation

Add PR title format to CONTRIBUTING.md (#10665)
Fix list markup to include blank lines required (#10591)
Put flake8-logging next to the other flake8 plugins in registry (#10587)
[flake8-bandit] Update warning message for rule S305 to address insecure block cipher mode use (#10602)
[flake8-bugbear] Document use of anonymous assignment in useless-expression (#10551)
[flake8-datetimez] Clarify error messages and docs for DTZ rules (#10621)
[pycodestyle] Use same before vs. after numbers for space-around-operator (#10640)
[ruff] Change quadratic-list-summation docs to use iadd consistently (#10666)

0.3.4

Preview features

[flake8-simplify] Detect implicit else cases in needless-bool (SIM103) (#10414)
[pylint] Implement nan-comparison (PLW0117) (#10401)
[pylint] Implement nonlocal-and-global (E115) (#10407)
[pylint] Implement singledispatchmethod-function (PLE5120) (#10428)
[refurb] Implement list-reverse-copy (FURB187) (#10212)

Rule changes

[flake8-pytest-style] Add automatic fix for pytest-parametrize-values-wrong-type (PT007) (#10461)
[pycodestyle] Allow SPDX license headers to exceed the line length (E501) (#10481)

Formatter

Fix unstable formatting for trailing subscript end-of-line comment (#10492)

Bug fixes

Avoid code comment detection in PEP 723 script tags (#10464)
Avoid incorrect tuple transformation in single-element case (C409) (#10491)
Bug fix: Prevent fully defined links name from being reformatted (#10442)
Consider raw source code for W605 (#10480)
Docs: Link inline settings when not part of options section (#10499)
Don't treat annotations as redefinitions in .pyi files (#10512)
Fix E231 bug: Inconsistent catch compared to pycodestyle, such as when dict nested in list (#10469)
Fix pylint upstream categories not showing in docs (#10441)
Add missing Options references to blank line docs (#10498)
'Revert "F821: Fix false negatives in .py files when from __future__ import annotations is active (#10362)"' (#10513)
Apply NFKC normalization to unicode identifiers in the lexer (#10412)
Avoid failures due to non-deterministic binding ordering (#10478)
[flake8-bugbear] Allow tuples of exceptions (B030) (#10437)
[flake8-quotes] Avoid syntax errors due to invalid quotes (Q000, Q002) (#10199)

0.3.3

Preview features

[flake8-bandit]: Implement S610 rule (#10316)
[pycodestyle] Implement blank-line-at-end-of-file (W391) (#10243)
[pycodestyle] Implement redundant-backslash (E502) (#10292)
[pylint] - implement redeclared-assigned-name (W0128) (#9268)

Rule changes

[flake8_comprehensions] Handled special case for C400 which also matches C416 (#10419)
[flake8-bandit] Implement upstream updates for S311, S324 and S605 (#10313)
[pyflakes] Remove F401 fix for __init__ imports by default and allow opt-in to unsafe fix (#10365)
[pylint] Implement invalid-bool-return-type (E304) (#10377)
[pylint] Include builtin warnings in useless-exception-statement (PLW0133) (#10394)

CLI

Add message on success to ruff check (#8631)

Bug fixes

[PIE970] Allow trailing ellipsis in typing.TYPE_CHECKING (#10413)
Avoid TRIO115 if the argument is a variable (#10376)
[F811] Avoid removing shadowed imports that point to different symbols (#10387)
Fix F821 and F822 false positives in .pyi files (#10341)
Fix F821 false negatives in .py files when from __future__ import annotations is active (#10362)
Fix case where Indexer fails to identify continuation preceded by newline #10351 (#10354)
Sort hash maps in Settings display (#10370)
Track conditional deletions in the semantic model (#10415)
[C413] Wrap expressions in parentheses when negating (#10346)
[pycodestyle] Do not ignore lines before the first logical line in blank lines rules. (#10382)
[pycodestyle] Do not trigger E225 and E275 when the next token is a ')' (#10315)
[pylint] Avoid false-positive slot non-assignment for __dict__ (PLE0237) (#10348)
Gate f-string struct size test for Rustc < 1.76 (#10371)

Documentation

Use ruff.toml format in README (#10393)
[RUF008] Make it clearer that a mutable default in a dataclass is only valid if it is typed as a ClassVar (#10395)
[pylint] Extend docs and test in invalid-str-return-type (E307) (#10400)
Remove . from check and format commands (#10217)

0.3.2

Preview features

Improve single-with item formatting for Python 3.8 or older (#10276)

Rule changes

[pyupgrade] Allow fixes for f-string rule regardless of line length (UP032) (#10263)
[pycodestyle] Include actual conditions in E712 diagnostics (#10254)

Bug fixes

Fix trailing kwargs end of line comment after slash (#10297)
Fix unstable with items formatting (#10274)
Avoid repeating function calls in f-string conversions (#10265)
Fix E203 false positive for slices in format strings (#10280)
Fix incorrect Parameter range for *args and **kwargs (#10283)
Treat typing.Annotated subscripts as type definitions (#10285)

0.3.1

Preview features

[pycodestyle] Fix E301 not triggering on decorated methods. (#10117)
[pycodestyle] Respect isort settings in blank line rules (E3*) (#10096)
[pycodestyle] Make blank lines in typing stub files optional (E3*) (#10098)
[pylint] Implement singledispatch-method (E1519) (#10140)
[pylint] Implement useless-exception-statement (W0133) (#10176)

Rule changes

[flake8-debugger] Check for use of debugpy and ptvsd debug modules (#10177) (#10194)
[pyupgrade] Generate diagnostic for all valid f-string conversions regardless of line length (UP032) (#10238)
[pep8_naming] Add fixes for N804 and N805 (#10215)

CLI

Colorize the output of ruff format --diff (#10110)
Make --config and --isolated global flags (#10150)
Correctly expand tildes and environment variables in paths passed to --config (#10219)

Configuration

Accept a PEP 440 version specifier for required-version (#10216)
Implement isort's default-section setting (#10149)

Bug fixes

Remove trailing space from CapWords message (#10220)
Respect external codes in file-level exemptions (#10203)
[flake8-raise] Avoid false-positives for parens-on-raise with future.exception() (RSE102) (#10206)
[pylint] Add fix for unary expressions in PLC2801 (#9587)
[ruff] Fix RUF028 not allowing # fmt: skip on match cases (#10178)

0.3.0

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

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)

0.2.2

Highlights include:

Initial support formatting f-strings (in --preview).
Support for overriding arbitrary configuration options via the CLI through an expanded --config argument (e.g., --config "lint.isort.combine-as-imports=false").
Significant performance improvements in Ruff's lexer, parser, and lint rules.

Preview features

Implement minimal f-string formatting (#9642)
[pycodestyle] Add blank line(s) rules (E301, E302, E303, E304, E305, E306) (#9266)
[refurb] Implement readlines_in_for (FURB129) (#9880)

Rule changes

[ruff] Ensure closing parentheses for multiline sequences are always on their own line (RUF022, RUF023) (#9793)
[numpy] Add missing deprecation violations (NPY002) (#9862)
[flake8-bandit] Detect mark_safe usages in decorators (#9887)
[ruff] Expand asyncio-dangling-task (RUF006) to include new_event_loop (#9976)
[flake8-pyi] Ignore 'unused' private type dicts in class scopes (#9952)

Formatter

Docstring formatting: Preserve tab indentation when using indent-style=tabs (#9915)
Disable top-level docstring formatting for notebooks (#9957)
Stabilize quote-style's preserve mode (#9922)

CLI

Allow arbitrary configuration options to be overridden via the CLI (#9599)

Bug fixes

Make show-settings filters directory-agnostic (#9866)
Respect duplicates when rewriting type aliases (#9905)
Respect tuple assignments in typing analyzer (#9969)
Use atomic write when persisting cache (#9981)
Use non-parenthesized range for DebugText (#9953)
[flake8-simplify] Avoid false positive with async for loops (SIM113) (#9996)
[flake8-trio] Respect async with in timeout-without-await (#9859)
[perflint] Catch a wider range of mutations in PERF101 (#9955)
[pycodestyle] Fix E30X panics on blank lines with trailing white spaces (#9907)
[pydocstyle] Allow using parameters as a subsection header (D405) (#9894)
[pydocstyle] Fix blank-line docstring rules for module-level docstrings (#9878)
[pylint] Accept 0.0 and 1.0 as common magic values (PLR2004) (#9964)
[pylint] Avoid suggesting set rewrites for non-hashable types (#9956)
[ruff] Avoid false negatives with string literals inside of method calls (RUF027) (#9865)
[ruff] Fix panic on with f-string detection (RUF027) (#9990)
[ruff] Ignore builtins when detecting missing f-strings (#9849)

Performance

Use memchr for string lexing (#9888)
Use memchr for tab-indentation detection (#9853)
Reduce Result<Tok, LexicalError> size by using Box<str> instead of String (#9885)
Reduce size of Expr from 80 to 64 bytes (#9900)
Improve trailing comma rule performance (#9867)
Remove unnecessary string cloning from the parser (#9884)

0.2.1

This release includes support for range formatting (i.e., the ability to format specific lines within a source file).

Preview features

[refurb] Implement missing-f-string-syntax (RUF027) (#9728)
Format module-level docstrings (#9725)

Formatter

Add --range option to ruff format (#9733)
Don't trim last empty line in docstrings (#9813)

Bug fixes

Skip empty lines when determining base indentation (#9795)
Drop __get__ and __set__ from unnecessary-dunder-call (#9791)
Respect generic Protocol in ellipsis removal (#9841)
Revert "Use publicly available Apple Silicon runners (#9726)" (#9834)

Performance

Skip LibCST parsing for standard dedent adjustments (#9769)
Remove CST-based fixer for C408 (#9822)
Add our own ignored-names abstractions (#9802)
Remove CST-based fixers for C400, C401, C410, and C418 (#9819)
Use AhoCorasick to speed up quote match (#9773)
Remove CST-based fixers for C405 and C409 (#9821)
Add fast-path for comment detection (#9808)
Invert order of checks in zero-sleep-call (#9766)
Short-circuit typing matches based on imports (#9800)
Run dunder method rule on methods directly (#9815)
Track top-level module imports in the semantic model (#9775)
Slight speed-up for lowercase and uppercase identifier checks (#9798)
Remove LibCST-based fixer for C403 (#9818)

Documentation

Update max-pos-args example to max-positional-args (#9797)
Fixed example code in weak_cryptographic_key.rs (#9774)
Fix references to deprecated ANN rules in changelog (#9771)
Fix default for max-positional-args (#9838)

0.2.0

Breaking changes

The NURSERY selector cannot be used anymore
Legacy selection of nursery rules by exact codes is no longer allowed without preview enabled

See also, the "Remapped rules" section which may result in disabled rules.

Deprecations

The following rules are now deprecated:

missing-type-self (ANN101)
missing-type-cls (ANN102)

The following command line options are now deprecated:

--show-source; use --output-format full instead
--no-show-source; use --output-format concise instead
--output-format text; use full or concise instead

The following settings have moved and the previous name is deprecated:

ruff.allowed-confusables → ruff.lint.allowed-confusables
ruff.dummy-variable-rgx → ruff.lint.dummy-variable-rgx
ruff.explicit-preview-rules → ruff.lint.explicit-preview-rules
ruff.extend-fixable → ruff.lint.extend-fixable
ruff.extend-ignore → ruff.lint.extend-ignore
ruff.extend-per-file-ignores → ruff.lint.extend-per-file-ignores
ruff.extend-safe-fixes → ruff.lint.extend-safe-fixes
ruff.extend-select → ruff.lint.extend-select
ruff.extend-unfixable → ruff.lint.extend-unfixable
ruff.extend-unsafe-fixes → ruff.lint.extend-unsafe-fixes
ruff.external → ruff.lint.external
ruff.fixable → ruff.lint.fixable
ruff.flake8-annotations → ruff.lint.flake8-annotations
ruff.flake8-bandit → ruff.lint.flake8-bandit
ruff.flake8-bugbear → ruff.lint.flake8-bugbear
ruff.flake8-builtins → ruff.lint.flake8-builtins
ruff.flake8-comprehensions → ruff.lint.flake8-comprehensions
ruff.flake8-copyright → ruff.lint.flake8-copyright
ruff.flake8-errmsg → ruff.lint.flake8-errmsg
ruff.flake8-gettext → ruff.lint.flake8-gettext
ruff.flake8-implicit-str-concat → ruff.lint.flake8-implicit-str-concat
ruff.flake8-import-conventions → ruff.lint.flake8-import-conventions
ruff.flake8-pytest-style → ruff.lint.flake8-pytest-style
ruff.flake8-quotes → ruff.lint.flake8-quotes
ruff.flake8-self → ruff.lint.flake8-self
ruff.flake8-tidy-imports → ruff.lint.flake8-tidy-imports
ruff.flake8-type-checking → ruff.lint.flake8-type-checking
ruff.flake8-unused-arguments → ruff.lint.flake8-unused-arguments
ruff.ignore → ruff.lint.ignore
ruff.ignore-init-module-imports → ruff.lint.ignore-init-module-imports
ruff.isort → ruff.lint.isort
ruff.logger-objects → ruff.lint.logger-objects
ruff.mccabe → ruff.lint.mccabe
ruff.pep8-naming → ruff.lint.pep8-naming
ruff.per-file-ignores → ruff.lint.per-file-ignores
ruff.pycodestyle → ruff.lint.pycodestyle
ruff.pydocstyle → ruff.lint.pydocstyle
ruff.pyflakes → ruff.lint.pyflakes
ruff.pylint → ruff.lint.pylint
ruff.pyupgrade → ruff.lint.pyupgrade
ruff.select → ruff.lint.select
ruff.task-tags → ruff.lint.task-tags
ruff.typing-modules → ruff.lint.typing-modules
ruff.unfixable → ruff.lint.unfixable

Remapped rules

The following rules have been remapped to new codes:

raise-without-from-inside-except: TRY200 to B904
suspicious-eval-usage: PGH001 to S307
logging-warn: PGH002 to G010
static-key-dict-comprehension: RUF011 to B035
runtime-string-union: TCH006 to TCH010

Stabilizations

The following rules have been stabilized and are no longer in preview:

trio-timeout-without-await (TRIO100)
trio-sync-call (TRIO105)
trio-async-function-with-timeout (TRIO109)
trio-unneeded-sleep (TRIO110)
trio-zero-sleep-call (TRIO115)
unnecessary-escaped-quote (Q004)
enumerate-for-loop (SIM113)
zip-dict-keys-and-values (SIM911)
timeout-error-alias (UP041)
flask-debug-true (S201)
tarfile-unsafe-members (S202)
ssl-insecure-version (S502)
ssl-with-bad-defaults (S503)
ssl-with-no-version (S504)
weak-cryptographic-key (S505)
ssh-no-host-key-verification (S507)
django-raw-sql (S611)
mako-templates (S702)
generator-return-from-iter-method (PYI058)
runtime-string-union (TCH006)
numpy2-deprecation (NPY201)
quadratic-list-summation (RUF017)
assignment-in-assert (RUF018)
unnecessary-key-check (RUF019)
never-union (RUF020)
direct-logger-instantiation (LOG001)
invalid-get-logger-argument (LOG002)
exception-without-exc-info (LOG007)
undocumented-warn (LOG009)

Fixes for the following rules have been stabilized and are now available without preview:

triple-single-quotes (D300)
non-pep604-annotation (UP007)
dict-get-with-none-default (SIM910)
in-dict-keys (SIM118)
collapsible-else-if (PLR5501)
if-with-same-arms (SIM114)
useless-else-on-loop (PLW0120)
unnecessary-literal-union (PYI030)
unnecessary-spread (PIE800)
error-instead-of-exception (TRY400)
redefined-while-unused (F811)
duplicate-value (B033)
multiple-imports-on-one-line (E401)
non-pep585-annotation (UP006)

Fixes for the following rules have been promoted from unsafe to safe:

unaliased-collections-abc-set-import (PYI025)

The following behaviors have been stabilized:

module-import-not-at-top-of-file (E402) allows sys.path modifications between imports
reimplemented-container-builtin (PIE807) includes lambdas that can be replaced with dict
unnecessary-placeholder (PIE790) applies to unnecessary ellipses (...)
if-else-block-instead-of-dict-get (SIM401) applies to if-else expressions

Preview features

[refurb] Implement metaclass_abcmeta (FURB180) (#9658)
Implement blank_line_after_nested_stub_class preview style (#9155)
The preview rule and-or-ternary (PLR1706) was removed

Bug fixes

[flake8-async] Take pathlib.Path into account when analyzing async functions (#9703)
[flake8-return] - fix indentation syntax error (RET505) (#9705)
Detect multi-statement lines in else removal (#9748)
RUF022, RUF023: never add two trailing commas to the end of a sequence (#9698)
RUF023: Don't sort __match_args__, only __slots__ (#9724)
[flake8-simplify] - Fix syntax error in autofix (SIM114) (#9704)
[pylint] Show verbatim constant in magic-value-comparison (PLR2004) (#9694)
Removing trailing whitespace inside multiline strings is unsafe (#9744)
Support IfExp with dual string arms in invalid-envvar-default (#9734)
[pylint] Add __mro_entries__ to known dunder methods (PLW3201) (#9706)

Documentation

Removed rules are now retained in the documentation (#9691)
Deprecated rules are now indicated in the documentation (#9689)

0.1.15

Preview features

Error when NURSERY selector is used with --preview (#9682)
Preserve indentation around multiline strings in formatter (#9637)
[flake8-return] Add fixes for all rules (RET505, RET506, RET507, RET508) (#9595)
[flake8-simplify] Add fix for if-with-same-arms (SIM114) (#9591)
[pycodestyle] Add fix for multiple-imports-on-one-line (E401) (#9518)
[pylint] Add fix for collapsible-else-if (PLR5501) (#9594)
[pylint] Add fix for useless-else-on-loop (PLW0120) (#9590)
[pylint] Implement assigning-non-slot (E0237) (#9623)
[pylint] Implement potential-index-error (PLE0643) (#9545)
[pylint] Implement too-many-nested-blocks (PLR1702) (#9172)
[ruff] Add rule to sort __slots__ and __match_args__ (#9564)
[ruff] Detect unnecessary dict comprehensions for iterables (RUF025) (#9613)
[ruff] Guard against use of default_factory as a keyword argument (RUF026) (#9651)
[ruff] Implement mutable-fromkeys-value (RUF024) (#9597)

CLI

Enable auto-wrapping of --help output (#9633)

Bug fixes

Avoid rendering display-only rules as fixable (#9649)
Detect automagic-like assignments in notebooks (#9653)
Generate custom JSON schema for dynamic setting (#9632)
[flake8-no-pep420] Include global --config when determining namespace packages (#9603)
[flake8-pie] Omit bound tuples passed to .startswith or .endswith (#9661)
[flake8-return] Avoid panic when fixing inlined else blocks (#9657)
[flake8-return] Consider exception suppression in unnecessary assignment (#9673)
[flake8-return] Take NoReturn annotation into account when analyzing implicit returns (#9636)
[flake8-simplify] Support inverted returns in needless-bool (SIM103) (#9619)
[flake8-type-checking] Add Pydantic's BaseConfig to default-copy list (#9650)
[flake8-type-checking] Avoid marking InitVar as a typing-only annotation (#9688)
[pycodestyle] Allow dtype comparisons in type-comparison (#9676)
[pydocstyle] Re-implement last-line-after-section (D413) (#9654)

Documentation

[flake8-pytest-style] Add fix safety documentation for duplicate-parameterize-test-cases (#9678)
[pylint] Document literal-membership fix safety conditions (#9677)
[isort] Fix reference to isort rule code (#9598)

0.1.14

Preview features

[flake8-bugbear] Add fix for duplicate-value (B033) (#9510)
[flake8-simplify] Implement enumerate-for-loop (SIM113) (#7777)
[pygrep_hooks] Add fix for deprecated-log-warn (PGH002) (#9519)
[pylint] Implement import-private-name (C2701) (#5920)
[refurb] Implement regex-flag-alias with fix (FURB167) (#9516)
[ruff] Add rule and fix to sort contents of __all__ (RUF022) (#9474)
[tryceratops] Add fix for error-instead-of-exception (TRY400) (#9520)

Rule changes

[flake8-pyi] Fix PYI047 false negatives on PEP-695 type aliases (#9566)
[flake8-pyi] Fix PYI049 false negatives on call-based TypedDicts (#9567)
[pylint] Exclude self and cls when counting method arguments (PLR0917) (#9563)

CLI

--show-settings displays active settings in a far more readable format (#9464)
Add --extension support to the formatter (#9483)

Configuration

Ignore preview status for fixable and unfixable selectors (#9538)
[pycodestyle] Use the configured tab size when expanding indents (#9506)

Bug fixes

Recursively visit deferred AST nodes (#9541)
Visit deferred lambdas before type definitions (#9540)
[flake8-simplify] Avoid some more enumerate-for-loop false positives (SIM113) (#9515)
[pandas-vet] Limit inplace diagnostics to methods that accept inplace (#9495)
[pylint] Add the __prepare__ method to the list of recognized dunder method (#9529)
[pylint] Ignore unnecessary dunder calls within dunder definitions (#9496)
[refurb] Avoid bailing when reimplemented-operator is called on function (FURB118) (#9556)
[ruff] Avoid treating named expressions as static keys (RUF011) (#9494)

Documentation

Add instructions on using noqa with isort rules (#9555)
Documentation update for URL giving 'page not found' (#9565)
Fix admonition in dark mode (#9502)
Update contributing docs to use cargo bench -p ruff_benchmark (#9535)
Update emacs integration section to include emacs-ruff-format (#9403)
[flake8-blind-except] Document exceptions to blind-except rule (#9580)

0.1.13

Bug fixes

Include base pyproject when initializing cache settings (#9480)
[flake8-simplify] Account for possibly-empty f-string values in truthiness logic (#9484)
[pylint] Add the missing period in unnecessary-dunder-call (#9485)
[pylint] Fix __aenter__ message in unnecessary-dunder-call (#9492)

0.1.12

Preview features

Formatter: Hug multiline-strings in preview style (#9243)
[flake8-bandit] Add ssl-with-no-version (S504) (#9384)
[flake8-bandit] Implement ssl-insecure-version (S502) (#9390)
[flake8-bandit] Implement ssl-with-bad-defaults (S503) (#9391)
[flake8-bandit] Implement suspicious import rules (S4XX) (#8831)
[flake8-simplify] Implement zip-dict-keys-and-values (SIM911) (#9460)
[pyflakes] Add a fix for redefined-while-unused (F811) (#9419)
[pylint] Implement unnecessary-dunder-call (C2801) (#9166)
[ruff] Add parenthesize-chained-operators (RUF021) to enforce parentheses in a or b and c (#9440)

Rule changes

[flake8-boolean-trap] Allow Boolean positional arguments in setters (#9429)
[flake8-builtins] Restrict builtin-attribute-shadowing (A003) to actual shadowed references (#9462)
[flake8-pyi] Add fix for generator-return-from-iter-method (PYI058) (#9355)
[pyflakes] Don't flag redefined-while-unused (F811) in if branches (#9418)
[pyupgrade] Add some additional Python 3.12 typing members to deprecated-import (#9445)
[ruff] Add fix for parenthesize-chained-operators (RUF021) (#9449)
[ruff] Include subscripts and attributes in static key rule (RUF011) (#9416)
[ruff] Support variable keys in static dictionary key rule (RUF011) (#9411)

Formatter

Generate deterministic IDs when formatting notebooks (#9359)
Allow # fmt: skip with interspersed same-line comments (#9395)
Parenthesize breaking named expressions in match guards (#9396)

Bug fixes

Add cell indexes to all diagnostics (#9387)
Avoid infinite loop in constant vs. None comparisons (#9376)
Handle raises with implicit alternate branches (#9377)
Ignore trailing quotes for unclosed l-brace errors (#9388)
Respect multi-segment submodule imports when resolving qualified names (#9382)
Use DisplayParseError for stdin parser errors (#9409)
Use comment_ranges for isort directive extraction (#9414)
Use transformed source code for diagnostic locations (#9408)
[flake8-pyi] Exclude warnings.deprecated and typing_extensions.deprecated arguments (#9423)
[flake8-pyi] Fix false negative for unused-private-protocol (PYI046) with unused generic protocols (#9405)
[pydocstyle] Disambiguate argument descriptors from section headers (#9427)
[pylint] Homogenize PLR0914 message to match other PLR09XX rules (#9399)
[ruff] Allow Hashable = None in type annotations (RUF013) (#9442)

Documentation

Fix admonition hyperlink colouring (#9385)
Add missing preview link (#9386)

0.1.11

Preview features

[pylint] Implement super-without-brackets (W0245) (#9257)

Bug fixes

Check path string properly in python -m ruff invocations (#9367)

Documentation

Tweak relative-imports message (#9365)
Add fix safety note for yield-in-for-loop (#9364)

0.1.10

Preview features

Improve dummy_implementations preview style formatting (#9240)
Normalise Hex and unicode escape sequences in strings (#9280)
Parenthesize long type annotations in annotated assignments (#9210)
Parenthesize multi-context managers in with statements (#9222)
[flake8-pyi] Implement generator-return-from-iter-method (PYI058) (#9313)
[pylint] Implement empty-comment (PLR2044) (#9174)
[refurb] Implement bit-count (FURB161) (#9265)
[ruff] Add never-union rule to detect redundant typing.NoReturn and typing.Never (#9217)

CLI

Add paths to TOML parse errors (#9358)
Add row and column numbers to formatter parse errors (#9321)
Improve responsiveness when invoked via Python (#9315)
Short rule messages should not end with a period (#9345)

Configuration

Respect runtime-required decorators on functions (#9317)

Bug fixes

Avoid asyncio-dangling-task for nonlocal and global bindings (#9263)
Escape trailing placeholders in rule documentation (#9301)
Fix continuation detection following multi-line strings (#9332)
Fix scoping for generators in named expressions in classes (#9248)
Port from obsolete wsl crate to is-wsl (#9356)
Remove special pre-visit for module docstrings (#9261)
Respect __str__ definitions from super classes (#9338)
Respect unused-noqa via per-file-ignores (#9300)
Respect attribute chains when resolving builtin call paths (#9309)
Treat all typing_extensions members as typing aliases (#9335)
Use Display for formatter parse errors (#9316)
Wrap subscripted dicts in parens for f-string conversion (#9238)
[flake8-annotations] Avoid adding return types to stub methods (#9277)
[flake8-annotations] Respect mixed return and raise cases in return-type analysis (#9310)
[flake8-bandit] Don't report violations when SafeLoader is imported from yaml.loader (S506) (#9299)
[pylint] Avoid panic when comment is preceded by Unicode (#9331)
[pylint] Change PLR0917 error message to match other PLR09XX messages (#9308)
[refurb] Avoid false positives for math-constant (FURB152) (#9290)

Documentation

Expand target name for better rule documentation (#9302)
Fix typos found by codespell (#9346)
[perflint] Document PERF102 fix un-safety (#9351)
[pyupgrade] Document UP007 fix un-safety (#9306)

0.1.9

Breaking changes

Add site-packages to default exclusions (#9188)

Preview features

Fix: Avoid parenthesizing subscript targets and values (#9209)
[pylint] Implement too-many-locals (PLR0914) (#9163)
Implement reimplemented_operator (FURB118) (#9171)
Add a rule to detect string members in runtime-evaluated unions (#9143)
Implement no_blank_line_before_class_docstring preview style (#9154)

Rule changes

CONSTANT_CASE variables are improperly flagged for yoda violation (SIM300) (#9164)
[flake8-pyi] Cover ParamSpecs and TypeVarTuples (PYI018) (#9198)
[flake8-bugbear] Add fix for zip-without-explicit-strict (B905) (#9176)
Add fix to automatically remove print and pprint statements (T201, T203) (#9208)
Prefer Never to NoReturn in auto-typing in Python >= 3.11 (ANN201) (#9213)

Formatter

can_omit_optional_parentheses: Exit early for unparenthesized expressions (#9125)
Fix dynamic mode with doctests so that it doesn't exceed configured line width (#9129)
Fix can_omit_optional_parentheses for expressions with a right most fstring (#9124)
Add target_version to formatter options (#9220)

CLI

Update ruff format --check to display message for already formatted files (#9153)

Bug fixes

Reverse order of arguments for operator.contains (#9192)
Iterate over lambdas in deferred type annotations (#9175)
Fix panic in D208 with multibyte indent (#9147)
Add support for NoReturn in auto-return-typing (#9206)
Allow removal of typing from exempt-modules (#9214)
Avoid mutable-class-default violations for Pydantic subclasses (#9187)
Fix dropped union expressions for piped non-types in PYI055 autofix (#9161)
Enable annotation quoting for multi-line expressions (#9142)
Deduplicate edits when quoting annotations (#9140)
Prevent invalid utf8 indexing in cell magic detection (#9146)
Avoid nested quotations in auto-quoting fix (#9168)
Add base-class inheritance detection to flake8-django rules (#9151)
Avoid asyncio-dangling-task violations on shadowed bindings (#9215)

Documentation

Fix blog post URL in changelog (#9119)
Add error suppression hint for multi-line strings (#9205)
Fix typo in SemanticModel.parent_expression docstring (#9167)
Document link between import sorting and formatter (#9117)

0.1.8

This release includes opt-in support for formatting Python snippets within docstrings via the docstring-code-format setting. Check out the blog post for more details!

Preview features

Add "preserve" quote-style to mimic Black's skip-string-normalization (#8822)
Implement prefer_splitting_right_hand_side_of_assignments preview style (#8943)
[pycodestyle] Add fix for unexpected-spaces-around-keyword-parameter-equals (#9072)
[pycodestyle] Add fix for comment-related whitespace rules (#9075)
[pycodestyle] Allow sys.path modifications between imports (#9047)
[refurb] Implement hashlib-digest-hex (FURB181) (#9077)

Rule changes

Allow flake8-type-checking rules to automatically quote runtime-evaluated references (#6001)
Allow transparent cell magics in Jupyter Notebooks (#8911)
[flake8-annotations] Avoid ANN2xx fixes for abstract methods with empty bodies (#9034)
[flake8-self] Ignore underscore references in type annotations (#9036)
[pep8-naming] Allow class names when apps.get_model is a non-string (#9065)
[pycodestyle] Allow matplotlib.use calls to intersperse imports (#9094)
[pyflakes] Support fixing unused assignments in tuples by renaming variables (F841) (#9107)
[pylint] Add fix for subprocess-run-without-check (PLW1510) (#6708)

Formatter

Add docstring-code-format knob to enable docstring snippet formatting (#8854)
Use double quotes for all docstrings, including single-quoted docstrings (#9020)
Implement "dynamic" line width mode for docstring code formatting (#9098)
Support reformatting Markdown code blocks (#9030)
add support for formatting reStructuredText code snippets (#9003)
Avoid trailing comma for single-argument with positional separator (#9076)
Fix handling of trailing target comment (#9051)

CLI

Hide unsafe fix suggestions when explicitly disabled (#9095)
Add SARIF support to --output-format (#9078)

Bug fixes

Apply unnecessary index rule prior to enumerate rewrite (#9012)
[flake8-err-msg] Allow EM fixes even if msg variable is defined (#9059)
[flake8-pie] Prevent keyword arguments duplication (#8450)
[flake8-pie] Respect trailing comma in unnecessary-dict-kwargs (PIE804) (#9015)
[flake8-raise] Avoid removing parentheses on ctypes.WinError (#9027)
[isort] Avoid invalid combination of force-sort-within-types and lines-between-types (#9041)
[isort] Ensure that from-style imports are always ordered first in __future__ (#9039)
[pycodestyle] Allow tab indentation before keyword (#9099)
[pylint] Ignore @overrides and @overloads for too-many-positional (#9000)
[pyupgrade] Enable printf-string-formatting fix with comments on right-hand side (#9037)
[refurb] Make math-constant (FURB152) rule more targeted (#9054)
[refurb] Support floating-point base in redundant-log-base (FURB163) (#9100)
[ruff] Detect unused-asyncio-dangling-task (RUF006) on unused assignments (#9060)

0.1.7

Preview features

Implement multiline dictionary and list hugging for preview style (#8293)
Implement the fix_power_op_line_length preview style (#8947)
Use Python version to determine typing rewrite safety (#8919)
[flake8-annotations] Enable auto-return-type involving Optional and Union annotations (#8885)
[flake8-bandit] Implement django-raw-sql (S611) (#8651)
[flake8-bandit] Implement tarfile-unsafe-members (S202) (#8829)
[flake8-pyi] Implement fix for unnecessary-literal-union (PYI030) (#7934)
[flake8-simplify] Extend dict-get-with-none-default (SIM910) to non-literals (#8762)
[pylint] - add unnecessary-list-index-lookup (PLR1736) + autofix (#7999)
[pylint] - implement R0202 and R0203 with autofixes (#8335)
[pylint] Implement repeated-keyword (PLe1132) (#8706)
[pylint] Implement too-many-positional (PLR0917) (#8995)
[pylint] Implement unnecessary-dict-index-lookup (PLR1733) (#8036)
[refurb] Implement redundant-log-base (FURB163) (#8842)

Rule changes

[flake8-boolean-trap] Allow booleans in @override methods (#8882)
[flake8-bugbear] Avoid B015,B018 for last expression in a cell (#8815)
[flake8-pie] Allow ellipses for enum values in stub files (#8825)
[flake8-pyi] Check PEP 695 type aliases for snake-case-type-alias and t-suffixed-type-alias (#8966)
[flake8-pyi] Check for kwarg and vararg NoReturn type annotations (#8948)
[flake8-simplify] Omit select context managers from SIM117 (#8801)
[pep8-naming] Allow Django model loads in non-lowercase-variable-in-function (N806) (#8917)
[pycodestyle] Avoid E703 for last expression in a cell (#8821)
[pycodestyle] Update E402 to work at cell level for notebooks (#8872)
[pydocstyle] Avoid D100 for Jupyter Notebooks (#8816)
[pylint] Implement fix for unspecified-encoding (PLW1514) (#8928)

Formatter

Avoid unstable formatting in ellipsis-only body with trailing comment (#8984)
Inline trailing comments for type alias similar to assignments (#8941)
Insert trailing comma when function breaks with single argument (#8921)

CLI

Update ruff check and ruff format to default to the current directory (#8791)
Stop at the first resolved parent configuration (#8864)

Configuration

[pylint] Default max-positional-args to max-args (#8998)
[pylint] Add allow-dunder-method-names setting for bad-dunder-method-name (PLW3201) (#8812)
[isort] Add support for from-first setting (#8663)
[isort] Add support for length-sort settings (#8841)

Bug fixes

Add support for @functools.singledispatch (#8934)
Avoid off-by-one error in stripping noqa following multi-byte char (#8979)
Avoid off-by-one error in with-item named expressions (#8915)
Avoid syntax error via invalid ur string prefix (#8971)
Avoid underflow in get_model matching (#8965)
Avoid unnecessary index diagnostics when value is modified (#8970)
Convert over-indentation rule to use number of characters (#8983)
Detect implicit returns in auto-return-types (#8952)
Fix start >= end error in over-indentation (#8982)
Ignore @overload and @override methods for too-many-arguments checks (#8954)
Lexer start of line is false only for Mode::Expression (#8880)
Mark pydantic_settings.BaseSettings as having default copy semantics (#8793)
Respect dictionary unpacking in NamedTuple assignments (#8810)
Respect local subclasses in flake8-type-checking (#8768)
Support type alias statements in simple statement positions (#8916)
[flake8-annotations] Avoid filtering out un-representable types in return annotation (#8881)
[flake8-pie] Retain extra ellipses in protocols and abstract methods (#8769)
[flake8-pyi] Respect local enum subclasses in simple-defaults (PYI052) (#8767)
[flake8-trio] Use correct range for TRIO115 fix (#8933)
[flake8-trio] Use full arguments range for zero-sleep-call (#8936)
[isort] fix: mark __main__ as first-party import (#8805)
[pep8-naming] Avoid N806 errors for type alias statements (#8785)
[perflint] Avoid PERF101 if there's an append in loop body (#8809)
[pycodestyle] Allow space-before-colon after end-of-slice (#8838)
[pydocstyle] Avoid non-character breaks in over-indentation (D208) (#8866)
[pydocstyle] Ignore underlines when determining docstring logical lines (#8929)
[pylint] Extend self-assigning-variable to multi-target assignments (#8839)
[tryceratops] Avoid repeated triggers in nested tryceratops diagnostics (#8772)

Documentation

Add advice for fixing RUF008 when mutability is not desired (#8853)
Added the command to run ruff using pkgx to the installation.md (#8955)
Document fix safety for flake8-comprehensions and some pyupgrade rules (#8918)
Fix doc formatting for zero-sleep-call (#8937)
Remove duplicate imports from os-stat documentation (#8930)
Replace generated reference to MkDocs (#8806)
Update Arch Linux package URL in installation.md (#8802)
[flake8-pyi] Fix error in t-suffixed-type-alias (PYI043) example (#8963)
[flake8-pyi] Improve motivation for custom-type-var-return-type (PYI019) (#8766)

0.1.6

Preview features

[flake8-boolean-trap] Extend boolean-type-hint-positional-argument (FBT001) to include booleans in unions (#7501)
[flake8-pie] Extend reimplemented-list-builtin (PIE807) to dict reimplementations (#8608)
[flake8-pie] Extend unnecessary-pass (PIE790) to include ellipses (...) (#8641)
[flake8-pie] Implement fix for unnecessary-spread (PIE800) (#8668)
[flake8-quotes] Implement unnecessary-escaped-quote (Q004) (#8630)
[pycodestyle] Implement fix for multiple-spaces-after-keyword (E271) and multiple-spaces-before-keyword (E272) (#8622)
[pycodestyle] Implement fix for multiple-spaces-after-operator (E222) and multiple-spaces-before-operator (E221) (#8623)
[pyflakes] Extend is-literal (F632) to include comparisons against mutable initializers (#8607)
[pylint] Implement redefined-argument-from-local (PLR1704) (#8159)
[pylint] Implement fix for unnecessary-lambda (PLW0108) (#8621)
[refurb] Implement if-expr-min-max (FURB136) (#8664)
[refurb] Implement math-constant (FURB152) (#8727)

Rule changes

[flake8-annotations] Add autotyping-like return type inference for annotation rules (#8643)
[flake8-future-annotations] Implement fix for future-required-type-annotation (FA102) (#8711)
[flake8-implicit-namespace-package] Avoid missing namespace violations in scripts with shebangs (#8710)
[pydocstyle] Update over-indentation (D208) to preserve indentation offsets when fixing overindented lines (#8699)
[pyupgrade] Refine timeout-error-alias (UP041) to remove false positives (#8587)

Formatter

Fix instability in await formatting with fluent style (#8676)
Compare formatted and unformatted ASTs during formatter tests (#8624)
Preserve trailing semicolon for Notebooks (#8590)

CLI

Improve debug printing for resolving origin of config settings (#8729)
Write unchanged, excluded files to stdout when read via stdin (#8596)

Configuration

[isort] Support disabling sections with no-sections = true (#8657)
[pep8-naming] Support local and dynamic class- and static-method decorators (#8592)
[pydocstyle] Allow overriding pydocstyle convention rules (#8586)

Bug fixes

Avoid syntax error via importing trio.lowlevel (#8730)
Omit unrolled augmented assignments in PIE794 (#8634)
Slice source code instead of generating it for EM fixes (#7746)
Allow whitespace around colon in slices for whitespace-before-punctuation (E203) (#8654)
Use function range for no-self-use (#8637)
F-strings doesn't contain bytes literal for PLW0129 (#8675)
Improve detection of TYPE_CHECKING blocks imported from typing_extensions or _typeshed (#8429)
Treat display as a builtin in IPython (#8707)
Avoid FURB113 autofix if comments are present (#8494)
Consider the new f-string tokens for flake8-commas (#8582)
Remove erroneous bad-dunder-name reference (#8742)
Avoid recommending Self usages in metaclasses (#8639)
Detect runtime-evaluated base classes defined in the current file (#8572)
Avoid inserting trailing commas within f-strings (#8574)
Remove incorrect deprecation label for stdout and stderr (#8743)
Fix unnecessary parentheses in UP007 fix (#8610)
Remove repeated and erroneous scoped settings headers in docs (#8670)
Trim trailing empty strings when converting to f-strings (#8712)
Fix ordering for force-sort-within-sections (#8665)
Run unicode prefix rule over tokens (#8709)
Update UP032 to unescape curly braces in literal parts of converted strings (#8697)
List all ipython builtins (#8719)

Documentation

Document conventions in the FAQ (#8638)
Redirect from rule codes to rule pages in docs (#8636)
Fix permalink to convention setting (#8575)

0.1.5

Preview features

[flake8-bandit] Implement mako-templates (S702) (#8533)
[flake8-trio] Implement TRIO105 (#8490)
[flake8-trio] Implement TRIO109 (#8534)
[flake8-trio] Implement TRIO110 (#8537)
[flake8-trio] Implement TRIO115 (#8486)
[refurb] Implement type-none-comparison (FURB169) (#8487)
Flag all comparisons against builtin types in E721 (#8491)
Make SIM118 fix as safe when the expression is a known dictionary (#8525)

Formatter

Fix multiline lambda expression statement formatting (#8466)

CLI

Add hidden --extension to override inference of source type from file extension (#8373)

Configuration

Account for selector specificity when merging extend_unsafe_fixes and override extend_safe_fixes (#8444)
Add support for disabling cache with RUFF_NO_CACHE environment variable (#8538)

Bug fixes

[E721] Flag comparisons to memoryview (#8485)
Allow collapsed-ellipsis bodies in other statements (#8499)
Avoid D301 autofix for u prefixed strings (#8495)
Only flag flake8-trio rules when trio import is present (#8550)
Reject more syntactically invalid Python programs (#8524)
Avoid raising TRIO115 violations for trio.sleep(...) calls with non-number values (#8532)
Fix F841 false negative on assignment to multiple variables (#8489)

Documentation

Fix link to isort known-first-party (#8562)
Add notes on fix safety to a few rules (#8500)
Add missing toml config tabs (#8512)
Add instructions for configuration of Emacs (#8488)
Improve detail link contrast in dark mode (#8548)
Fix typo in example (#8506)
Added tabs for configuration files in the documentation (#8480)
Recommend project.requires-python over target-version (#8513)
Add singleton escape hatch to B008 documentation (#8501)
Fix tab configuration docs (#8502)

0.1.4

Preview features

[flake8-trio] Implement timeout-without-await (TRIO001) (#8439)
[numpy] Implement NumPy 2.0 migration rule (NPY200) (#7702)
[pylint] Implement bad-open-mode (W1501) (#8294)
[pylint] Implement import-outside-toplevel (C0415) rule (#5180)
[pylint] Implement useless-with-lock (W2101) (#8321)
[pyupgrade] Implement timeout-error-alias (UP041) (#8476)
[refurb] Implement isinstance-type-none (FURB168) (#8308)
Detect confusable Unicode-to-Unicode units in RUF001, RUF002, and RUF003 (#4430)
Add newline after module docstrings in preview style (#8283)

Formatter

Add a note on line-too-long to the formatter docs (#8314)
Preserve trailing statement semicolons when using fmt: skip (#8273)
Preserve trailing semicolons when using fmt: off (#8275)
Avoid duplicating linter-formatter compatibility warnings (#8292)
Avoid inserting a newline after function docstrings (#8375)
Insert newline between docstring and following own line comment (#8216)
Split tuples in return positions by comma first (#8280)
Avoid treating byte strings as docstrings (#8350)
Add --line-length option to format command (#8363)
Avoid parenthesizing unsplittable because of comments (#8431)

CLI

Add --output-format to ruff rule and ruff linter (#8203)

Bug fixes

Respect --force-exclude in lint.exclude and format.exclude (#8393)
Respect --extend-per-file-ignores on the CLI (#8329)
Extend bad-dunder-method-name to permit __index__ (#8300)
Fix panic with 8 in octal escape (#8356)
Avoid raising D300 when both triple quote styles are present (#8462)
Consider unterminated f-strings in FStringRanges (#8154)
Avoid including literal shell=True for truthy, non-True diagnostics (#8359)
Avoid triggering single-element test for starred expressions (#8433)
Detect and ignore Jupyter automagics (#8398)
Fix invalid E231 error with f-strings (#8369)
Avoid triggering NamedTuple rewrite with starred annotation (#8434)
Avoid un-setting bracket flag in logical lines (#8380)
Place 'r' prefix before 'f' for raw format strings (#8464)
Remove trailing periods from NumPy 2.0 code actions (#8475)
Fix bug where PLE1307 was raised when formatting %c with characters (#8407)
Remove unicode flag from comparable (#8440)
Improve B015 message (#8295)
Use fixedOverflowWidgets for playground popover (#8458)
Mark byte_bounds as a non-backwards-compatible NumPy 2.0 change (#8474)

Internals

Add a dedicated cache directory per Ruff version (#8333)
Allow selective caching for --fix and --diff (#8316)
Improve performance of comment parsing (#8193)
Improve performance of string parsing (#8227)
Use a dedicated sort key for isort import sorting (#7963)

0.1.3

This release includes a variety of improvements to the Ruff formatter, removing several known and unintentional deviations from Black.

Formatter

Avoid space around pow for None, True and False (#8189)
Avoid sorting all paths in the format command (#8181)
Insert necessary blank line between class and leading comments (#8224)
Avoid introducing new parentheses in annotated assignments (#8233)
Refine the warnings about incompatible linter options (#8196)
Add test and basic implementation for formatter preview mode (#8044)
Refine warning about incompatible isort settings (#8192)
Only omit optional parentheses for starting or ending with parentheses (#8238)
Use source type to determine parser mode for formatting (#8205)
Don't warn about magic trailing comma when isort.force-single-line is true (#8244)
Use SourceKind::diff for formatter (#8240)
Fix fmt:off with trailing child comment (#8234)
Formatter parentheses support for IpyEscapeCommand (#8207)

Linter

[pylint] Add buffer methods to bad-dunder-method-name (PLW3201) exclusions (#8190)
Match rule prefixes from external codes setting in unused-noqa (#8177)
Use line-length setting for isort in lieu of pycodestyle.max-line-length (#8235)
Update fix for unnecessary-paren-on-raise-exception to unsafe for unknown types (#8231)
Correct quick fix message for W605 (#8255)

Documentation

Fix typo in max-doc-length documentation (#8201)
Improve documentation around linter-formatter conflicts (#8257)
Fix link to error suppression documentation in unused-noqa (#8172)
Add external option to unused-noqa documentation (#8171)
Add title attribute to icons (#8060)
Clarify unsafe case in RSE102 (#8256)
Fix skipping formatting examples (#8210)
docs: fix name of magic-trailing-comma option in README (#8200)
Add note about scope of rule changing in versioning policy (#8169)
Document: Fix default lint rules (#8218)
Fix a wrong setting in configuration.md (#8186)
Fix misspelled TOML headers in the tutorial (#8209)

0.1.2

This release includes the Beta version of the Ruff formatter — an extremely fast, Black-compatible Python formatter. Try it today with ruff format! Check out the blog post and read the docs.

Preview features

[pylint] Implement non-ascii-module-import (C2403) (#8056)
[pylint] implement non-ascii-name (C2401) (#8038)
[pylint] Implement unnecessary-lambda (W0108) (#7953)
[refurb] Implement read-whole-file (FURB101) (#7682)
Add fix for E223, E224, and E242 (#8143)
Add fix for E225, E226, E227, and E228 (#8136)
Add fix for E252 (#8142)
Add fix for E261 (#8114)
Add fix for E273 and E274 (#8144)
Add fix for E275 (#8133)
Update SIM401 to catch ternary operations (#7415)
Update E721 to allow is and is not for direct type comparisons (#7905)

Rule changes

Add backports.strenum to deprecated-imports (#8113)
Update SIM112 to ignore https_proxy, http_proxy, and no_proxy (#8140)
Update fix for literal-membership (PLR6201) to be unsafe (#8097)
Update fix for mutable-argument-defaults (B006) to be unsafe (#8108)

Formatter

Change line-ending default to auto (#8057)
Respect parenthesized generators in has_own_parentheses (#8100)
Add caching to formatter (#8089)
Remove --line-length option from format command (#8131)
Add formatter to line-length documentation (#8150)
Warn about incompatible formatter options (#8088)
Fix range of unparenthesized tuple subject in match statement (#8101)
Remove experimental formatter warning (#8148)
Don't move type param opening parenthesis comment (#8163)
Update versions in format benchmark script (#8110)
Avoid loading files for cached format results (#8134)

CLI

Show the ruff format command in help menus (#8167)
Add ruff version command with long version display (#8034)

Configuration

New pycodestyle.max-line-length option (#8039)

Bug fixes

Detect sys.version_info slices in outdated-version-block (#8112)
Avoid if-else simplification for TYPE_CHECKING blocks (#8072)
Avoid false-positive print separator diagnostic with starred argument (#8079)

Documentation

Fix message for too-many-arguments lint (#8092)
Fix extend-unsafe-fixes and extend-safe-fixes example (#8139)
Add links to flake8-import-conventions options (#8115)
Rework the documentation to incorporate the Ruff formatter (#7732)
Fix Options JSON schema description (#8081)
Fix typo (pytext -> pytest) (#8117)
Improve magic-value-comparison example in docs (#8111)

0.1.1

Rule changes

Add unsafe fix for escape-sequence-in-docstring (D301) (#7970)

Configuration

Respect #(deprecated) attribute in configuration options (#8035)
Add [format|lint].exclude options (#8000)
Respect tab-size setting in formatter (#8006)
Add lint.preview (#8002)

Preview features

[pylint] Implement literal-membership (PLR6201) (#7973)
[pylint] Implement too-many-boolean-expressions (PLR0916) (#7975)
[pylint] Implement misplaced-bare-raise (E0704) (#7961)
[pylint] Implement global-at-module-level (W0604) (#8058)
[pylint] Implement unspecified-encoding (PLW1514) (#7939)
Add fix for triple-single-quotes (D300) (#7967)

Formatter

New code style badge for ruff format (#7878)
Fix comments outside expression parentheses (#7873)
Add --target-version to ruff format (#8055)
Skip over parentheses when detecting in keyword (#8054)
Add --diff option to ruff format (#7937)
Insert newline after nested function or class statements (#7946)
Use pass over ellipsis in non-function/class contexts (#8049)

Bug fixes

Lazily evaluate all PEP 695 type alias values (#8033)
Avoid failed assertion when showing fixes from stdin (#8029)
Avoid flagging HTTP and HTTPS literals in urllib-open (#8046)
Avoid flagging bad-dunder-method-name for _ (#8015)
Remove Python 2-only methods from URLOpen audit (#8047)
Use set bracket replacement for iteration-over-set to preserve whitespace and comments (#8001)

Documentation

Update tutorial to match revised Ruff defaults (#8066)
Update rule B005 docs (#8028)
Update GitHub actions example in docs to use --output-format (#8014)
Document lint.preview and format.preview (#8032)
Clarify that new rules should be added to RuleGroup::Preview. (#7989)

0.1.0

This is the first release which uses the CHANGELOG file. See GitHub Releases for prior changelog entries.

Read Ruff's new versioning policy.

Breaking changes

Unsafe fixes are no longer displayed or applied without opt-in (#7769)
Drop formatting specific rules from the default set (#7900)
The deprecated format setting has been removed (#7984)
- The format setting cannot be used to configure the output format, use output-format instead
- The RUFF_FORMAT environment variable is ignored, use RUFF_OUTPUT_FORMAT instead
- The --format option has been removed from ruff check, use --output-format instead

Rule changes

Extend reimplemented-starmap (FURB140) to catch calls with a single and starred argument (#7768)
Improve cases covered by RUF015 (#7848)
Update SIM15 to allow open followed by close (#7916)
Respect msgspec.Struct default-copy semantics in RUF012 (#7786)
Add sqlalchemy methods to `flake8-boolean-trap`` exclusion list (#7874)
Add fix for PLR1714 (#7910)
Add fix for PIE804 (#7884)
Add fix for PLC0208 (#7887)
Add fix for PYI055 (#7886)
Update non-pep695-type-alias to require --unsafe-fixes outside of stub files (#7836)
Improve fix message for UP018 (#7913)
Update PLW3201 to support Enum sunder names (#7987)

Preview features

Only show warnings for empty preview selectors when enabling rules (#7842)
Add unnecessary-key-check to simplify key in dct and dct[key] to dct.get(key) (#7895)
Add assignment-in-assert to prevent walrus expressions in assert statements (#7856)
[refurb] Add single-item-membership-test (FURB171) (#7815)
[pylint] Add and-or-ternary (R1706) (#7811)

New rules are added in preview.

Configuration

Add unsafe-fixes setting (#7769)
Add extend-safe-fixes and extend-unsafe-fixes for promoting and demoting fixes (#7841)

CLI

Added --unsafe-fixes option for opt-in to display and apply unsafe fixes (#7769)
Fix use of deprecated --format option in warning (#7837)
Show changed files when running under --check (#7788)
Write summary messages to stderr when fixing via stdin instead of omitting them (#7838)
Update fix summary message in check --diff to include unsafe fix hints (#7790)
Add notebook cell field to JSON output format (#7664)
Rename applicability levels to Safe, Unsafe, and Display (#7843)

Bug fixes

Fix bug where f-strings were allowed in match pattern literal (#7857)
Fix SIM110 with a yield in the condition (#7801)
Preserve trailing comments in C414 fixes (#7775)
Check sequence type before triggering unnecessary-enumerate len suggestion (#7781)
Use correct start location for class/function clause header (#7802)
Fix incorrect fixes for SIM101 (#7798)
Format comment before parameter default correctly (#7870)
Fix E251 false positive inside f-strings (#7894)
Allow bindings to be created and referenced within annotations (#7885)
Show per-cell diffs when analyzing notebooks over stdin (#7789)
Avoid curly brace escape in f-string format spec (#7780)
Fix lexing single-quoted f-string with multi-line format spec (#7787)
Consider nursery rules to be in-preview for ruff rule (#7812)
Report precise location for invalid conversion flag (#7809)
Visit pattern match guard as a boolean test (#7911)
Respect --unfixable in ISC rules (#7917)
Fix edge case with PIE804 (#7922)
Show custom message in PTH118 for Path.joinpath with starred arguments (#7852)
Fix false negative in outdated-version-block when using greater than comparisons (#7920)
Avoid converting f-strings within Django gettext calls (#7898)
Fix false positive in PLR6301 (#7933)
Treat type aliases as typing-only expressions e.g. resolves false positive in TCH004 (#7968)
Resolve cache-dir relative to project root (#7962)
Respect subscripted base classes in type-checking rules e.g. resolves false positive in TCH003 (#7954)
Fix JSON schema limit for line-length (#7883)
Fix commented-out coalesce keyword (#7876)

Documentation

Document reimplemented-starmap performance effects (#7846)
Default to following the system dark/light mode (#7888)
Add documentation for fixes (#7901)
Fix typo in docs of PLR6301 (#7831)
Update UP038 docs to note that it results in slower code (#7872)
crlf -> cr-lf (#7766)
Add an example of an unsafe fix (#7924)
Fix documented examples for unnecessary-subscript-reversal (#7774)
Correct error in tuple example in ruff formatter docs (#7822)
Add versioning policy to documentation (#7923)
Fix invalid code in FURB177 example (#7832)

Formatter

Less scary ruff format message (#7867)
Remove spaces from import statements (#7859)
Formatter quoting for f-strings with triple quotes (#7826)
Update ruff_python_formatter generate.py comment (#7850)
Document one-call chaining deviation (#7767)
Allow f-string modifications in line-shrinking cases (#7818)
Add trailing comment deviation to README (#7827)
Add trailing zero between dot and exponential (#7956)
Force parentheses for power operations in unary expressions (#7955)

Playground

Fix playground Quick Fix action (#7824)

Files

CHANGELOG.md

Latest commit

History

CHANGELOG.md

File metadata and controls

Changelog

0.4.4

Preview features

Rule changes

Server

Bug fixes

0.4.3

Enhancements

Preview features

Rule changes

Formatter

LSP

Bug fixes

Performance

0.4.2

Rule changes

Server

Bug fixes

Documentation

Performance

0.4.1

Preview features

Bug fixes

0.4.0

A new, hand-written parser

A new language server in Rust

Preview features

Rule changes

Linter

Server

Configuration

Bug fixes

0.3.7

Preview features

Bug fixes

0.3.6

Preview features

Rule changes

CLI

Configuration

Bug fixes

0.3.5

Preview features

Rule changes

Configuration

Bug fixes

Documentation

0.3.4

Preview features

Rule changes

Formatter

Bug fixes

0.3.3

Preview features

Rule changes

CLI

Bug fixes

Documentation

0.3.2

Preview features

Rule changes

Bug fixes

0.3.1

Preview features

Rule changes

CLI

Configuration

Bug fixes

0.3.0

Preview features

Rule changes

Formatter

CLI

Bug fixes