Update dependency black to v26 #10

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BlazingNeutron merged 1 commit from renovate/black-26.x into main 2026-10-29 14:01:37 -04:00

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renovate-bot commented 2026-10-29 13:08:35 -04:00

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This PR contains the following updates:

Package	Update	Change
black (changelog)	major	==22.12.0 → ==26.10.1

---

Release Notes

psf/black (black)

v26.10.1

Compare Source

Highlights

This release fixes a security issue in Black's bundled GitHub Action. Repositories that
use the action are encouraged to update to the latest version of Black immediately. This
update is received automatically when using psf/black@stable, and is independent of
the version of Black installed by the action.

When the GitHub Action reads version specifiers from tool.black.required-version, it
now only accepts released versions of Black, as it already did for black requirements
in dependency lists. Other values, such as URL references, are now rejected. This issue
has been registered as GHSA-cg8m-r9f2-5wm2; a CVE identifier is pending.

Stable style

• Fix a long Jupyter notebook assignment magic (for example x = !ls -la) being wrapped
  in parentheses, which IPython can no longer run; such cells are now left unchanged
  (#​5481)
• Keep repeated lines outside the selected --line-ranges unchanged (#​5436)
• Fix --line-ranges formatting lines that follow a statement when formatting joins or
  re-indents that statement (#​5484)
• Fix --line-ranges crashing with an internal error when an unselected statement has a
  # fmt: skip comment on the last line before a closing bracket (#​5477)
• Prevent moving an encoding declaration (for example # -*- coding: latin-1 -*-) onto
  the first two lines of a file (#​5487)
• Fix adding an extra trailing blank line inside a multi-line module docstring when its
  last line is near the line length limit (#​5494)
• Keep the parentheses around a walrus that is the only item in a set (for example
  {(x := f())}) when targeting Python 3.9 or older, since Python 3.8 and 3.9.0 can't
  parse it without them (#​5502)

Preview style

• Do not split short expressions on delimiters (such as binary operators, comparisons,
  or comprehensions) inside brackets when preceded by a standalone comment (#​5455)
• Fix the unstable string_processing feature removing backslash-newline sequences from
  raw strings, which changed their value (#​5482)
• Avoid adding unnecessary parentheses around unbreakable right-hand side expressions in
  assignments (such as annotated assignments or subscript targets) (#​5473)
• Parenthesize expressions with parameter comments when they exceed the line length
  under --preview (#​5442)
• Fix wrap_long_dict_values_in_parens dropping the parentheses around a right-hand
  side that contains a dictionary, leaving a line over the length limit (#​5492)
• Fix the unstable string_processing feature adding a space after * or ** in a PEP
  695 type parameter (* Ts = ...) when it splits a string in the parameter's default
  (#​5504)
• Avoid unnecessary line splits of trailers (such as indexing/subscripts) when an
  earlier bracket split exceeds the line length only due to a trailing comment (#​5498)

Configuration

• Add --cache-dir to configure the cache directory from the command line (#​5433)
• Don't cache a file as formatted after formatting or checking it with --line-ranges,
  which made a later full black --check pass and black skip the unformatted lines
  (#​5476)
• Respect a .gitignore that starts with a UTF-8 byte order mark. The mark became part
  of the first pattern, so that pattern never matched and Black formatted files that git
  ignores (#​5497)

Performance

• Avoid quadratic runtime when splitting very long lines with many trailing bracket
  pairs (such as consecutive subscripts) (#​5475)

Integrations

• Fix the GitHub Action crashing on dependency-group includes when use_pyproject is
  enabled (#​5479)
• When the GitHub Action reads version specifiers from tool.black.required-version, it
  now only accepts released versions of Black, as it already did for black
  requirements in dependency lists. Other values, such as URL references, are now
  rejected. (#​5510)

v26.10.0

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Stable style

• --line-ranges no longer inserts an empty line after a docstring when the range
  covers only the docstring itself (#​5312)
• Fix # fmt: skip on a bracketed ternary turning the surrounding tuple into a call
  (#​5464)
• Fix crash when # fmt: skip is placed on a one-line function or class with PEP 695
  type parameters (#​5429)
• Fix an inline comment after the closing bracket of optional parentheses being moved
  inside the parentheses when the parenthesized expression contains own-line comments
  (#​5395)
• Fix unparseable output when # fmt: skip is placed on a bracket of an if, while,
  for, or with header (#​5401, #​5405)
• Fix crash when formatting parenthesized expressions with multiple inline comments and
  # fmt: skip (#​5414)
• Fix parsing Jupyter notebook assignment magics when non-ASCII characters appear
  earlier on the line (#​5381)
• Preserve blank lines that come immediately before a # fmt: on comment (#​5300)
• Keep the parentheses around the target of an annotated assignment (e.g.
  (x): int = 5), which prevent CPython from including the name in __annotations__
  (#​5321)
• Stop treating a t-string in docstring position as a docstring (e.g. t" spam " as
  the first statement of a module, class or function) (#​5287)
• Fix unparseable output for a t-string whose replacement field contains a quote (e.g.
  t'\'{a["b"]}\'') (#​5265)
• Fix unparseable output for a triple-quoted string whose body ends in an
  already-escaped double quote (e.g. '''\'''\"''') (#​5262)
• Fix --skip-magic-trailing-comma dropping the trailing comma from a split
  single-element tuple used as a lambda parameter default (#​5246)
• Fix unstable formatting when an inline comment sits on optional parentheses (e.g. a
  parenthesized assert message) (#​5241)
• Fix --skip-magic-trailing-comma dropping the trailing comma of a one-element
  subscript (a[x,]) when the line is long enough to be split and contains a power
  operator (#​5272)
• Fix crash when a standalone comment sits between tokens of a comprehension or lambda
  (#​5144)
• Fix inline comments on a bracket inside a comprehension being dropped (#​5330)
• Respect the magic trailing comma in a PEP 695 type parameter list containing a
  *TypeVarTuple or **ParamSpec (#​5244)
• Fix crash when a comment-only # fmt: off/# fmt: on block is followed by a with
  statement after another standalone comment (#​5189)
• Fix a crash when splitting case case if ... match patterns at very small line
  lengths (#​5147)
• Fix multiline docstring indentation when leading tabs are used inside indented
  docstrings (#​5148)
• Respect # fmt: skip on a line that opens a bracket (e.g.
  from x import ( # fmt: skip) when a standalone comment is among the bracket's
  contents (#​5161)
• Fix an AST safety error when separate # type: ignore comments in a parenthesized
  attribute chain were merged onto one physical line (#​5297)
• Preserve comments and blank lines outside requested ranges when formatting with
  --line-ranges (#​5175)
• Fix crash when # fmt: skip is used on one-line async def, async with, and
  async for statements containing a semicolon (#​5311)
• Stop converting form feeds or other similar characters in docstrings into newlines
  (#​5461)
• Fix --skip-source-first-line turning the skipped line's CRLF ending into \r\r\n
  when reformatting a file with CRLF line endings (#​5438)

Preview style

New preview features

• Add missing blank lines after classes whose last method has an ellipsis body (#​5439)
• Split only the brackets holding a magic trailing comma when more trailers follow them
  (e.g. stop splitting inside the [2] of [1,][2](3)) (#​5448)
• Keep dictionary keys containing operators together on one line when the value can be
  wrapped onto a new line instead (#​5435)
• Remove redundant parentheses around individual variables in unpacking targets (e.g.
  for (x), (y) in points: becomes for x, y in points:) (#​5416)
• Normalize uppercase T prefixes on t-strings to lowercase (#​5425)
• Remove redundant parentheses around generator expressions (#​5304, #​5369)
• Preserve two blank lines before a top-level class starting inside a # fmt: off block
  after an import (#​5238)
• Fix unnecessary parentheses around short right-hand expressions in indexed assignments
  (e.g. x[key] = expr) (#​5095)
• Parenthesize tuple expressions in yield statements for consistency with function
  calls and returns (#​5170)
• Stop splitting between a variable and its operator (not in, ==, is, ...) when
  the right-hand side is a bracketed expression, and instead split inside the brackets
  (#​5135)
• In .pyi stub files, enforce a blank line after a function or method that has a
  docstring-only body when another comment or statement follows it (#​5158)

Updates to existing preview features

• Fix crash in stub files when # fmt: skip is placed on a function in a group of
  same-name decorated functions (e.g. @overloads or a property setter) (#​5430)
• Keep the parentheses around a lambda used as the iterable of a comprehension (e.g.
  [x for x in (lambda: 0) if x]) (#​5176, #​5200)

Updates to existing unstable features

• Do not treat multi-line expressions with merged strings and trailing # type: ignore
  comments as single-line unsplittable expressions (#​5466)
• Fix duplicated inline comment when stripping the parentheses around a string or
  merging a backslash-continued string on the same line (#​5449)
• Split long stringified return annotations even when the function has parameters
  (#​5427)
• Don't hug brackets when doing so would join two # type: ignore comments onto one
  line (#​5271)
• Fix a crash when # type: ignore is lost during formatting of a long parenthesized
  string (#​5329)
• Fix only the first part of an implicitly concatenated unmergeable string (e.g.
  r"..." r"...") being wrapped in parentheses (#​5434)

Configuration

• Add support for NO_COLOR environment variable to disable ANSI output (#​5129)
• Remove spurious target version warning when runtime version is included in a
  --target-version flag (#​5167)
• Fix --force-exclude not excluding files whose path contains .. (e.g.
  black ../generated/file.py run from a subdirectory) (#​5471)
• Fall back to the default configuration, with a warning, when the given sources share
  no common project root (e.g. they are on different drives on Windows) instead of
  crashing (#​5386)
• Fix loading a stale cached pyproject.toml path when --code is used from different
  working directories in the same process (#​5152)
• Add validation for --line-ranges values (#​5107)
• Ignore empty cache files instead of raising an EOFError (#​5192)
• Reject non-string include and force-exclude values in pyproject.toml (#​5193)
• Validate BLACK_NUM_WORKERS values and report invalid values as usage errors instead
  of crashing (#​5211)
• Ignore permission errors when reading cache (#​5258)

Packaging

• Reduce the size of Linux standalone binaries by stripping debug symbols during the
  PyInstaller release build (#​5223)
• Black is now released using GitHub
  Immutable Releases
  (#​5296)

Performance

• Fix superlinear runtime growth with the number of input files (#​5450)
• Improve performance on strings containing many consecutive backslashes (#​5163)
• Improve performance on files with many # fmt: skip/# fmt: off/# fmt: on comments
  (#​5169, #​5190, #​5232)
• Improve performance on long calls and collections (#​5177)
• Improve performance on multiline strings inside large collections (e.g. a dict literal
  with triple-quoted strings as values) (#​5188)
• Improve performance on files with many soft keywords (e.g. match/case blocks)
  (#​5186)
• Improve performance on long semicolon-separated statements (in the stable style) and
  large dict literals (in --preview) (#​5184)
• Improve performance of --line-ranges on files with many sibling blocks (a long
  if/elif chain, a match with many cases, or many top-level definitions) (#​5213)
• Improve performance on deeply nested bracketed expressions (#​5171, #​5242)
• Improve performance on lists and subscripts holding one long expression without
  operators (e.g. a long run of implicitly concatenated strings inside []) (#​5239)
• Improve performance on deeply chained operations (e.g. a long a ** b ** c ** ...
  chain) (#​5235)
• Improve performance on long if/elif chains and other compound statements with many
  clauses (#​5322)
• Improve performance of string_processing:
  • when merging implicitly concatenated f-strings containing long string literals
    (#​5165)
  • when merging long implicitly concatenated strings (#​5173, #​5194)
  • when rewriting large nodes (e.g. "%s ..." % (a, b, c, ...)) (#​5178, #​5199, #​5220)
  • when splitting long string literals (#​5183)

Output

• Report parser failures using editor-friendly path:line:column locations (#​5237)
• Fix crash when writing formatted code or diffs to a sys.stdout that has no buffer
  attribute (e.g. in Jupyter notebooks) (#​5411)
• Report parse failures on Black's own output as internal errors (#​5383)

Blackd

• Return HTTP 400 instead of 500 when the X-Python-Variant header is empty or has an
  empty entry (e.g. a trailing comma) (#​5428)
• Allow optional whitespace around comma-separated versions and pyi in the
  X-Python-Variant header (#​5441)

Integrations

• Remove unused migrate-black script (#​5319)
• Support PEP 440 version specifiers in tool.black.required-version for the GitHub
  Action (#​5399)
• Add outputs (is_formatted, change_count, same_count, failure_count) to GitHub
  Action runs (#​5408)

Documentation

• Document vim-python-pep8-indent, which provides an indentexpr for Black-style
  insert-mode indentation (#​5288)

v26.5.1

Compare Source

Stable style

• Fix unstable formatting of annotated assignments whose subscript annotation contains
  an inline comment (e.g. x: list[ # pyright: ignore[...]) (#​5130)
• Preserve inline comments (including # type: ignore) immediately before a
  # fmt: skip line, avoiding AST equivalence failures (#​5139)

Packaging

• Correct the version in the published executables (#​5137)

Documentation

• Add Neovim integration guide covering conform.nvim, ALE, and simple command approaches
  (#​5124)

v26.5.0

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Highlights

• Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 (#​5048)
• Python 3.15 is now supported. Compiled wheels are not yet provided for Python 3.15, so
  performance may be slower than on existing Python versions. Wheels will be provided
  once Python 3.15 is later in its release cycle. (#​5127)

Stable style

• Fix # fmt: skip being ignored in nested if expressions with parenthesized in
  clauses (#​4903)
• Add syntactic support for Python 3.15 (#​5048)
• Fix crash when an f-string follows a # fmt: off comment inside brackets (#​5097)
• Preserve multiline compound statement headers when # fmt: skip is placed on the
  colon line (#​5117)

Preview style

• Improve heuristics around whether blank lines should appear before, within and after
  groups of same-name decorated functions (such as @overload groups) in .pyi stub
  files (#​5021)
• Fix blank lines being removed between a function and a decorated class in .pyi stub
  files (#​5092)
• Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. # type: ignore) follows the closing bracket (#​5096)

Packaging

• Run CI on 3.15 (#​5127)

Output

• Improve parse error readability by showing multi-line output with an error pointer.
  (#​5068)
• Add SourceASTParseError to distinguish source parse failures from internal safety
  errors, improving error reporting when Black's lenient parser accepts input that
  ast.parse() rejects (#​5080)

Blackd

• Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors (#​5080)

Integrations

• Added documentation for doctest formatting tools and updated the integrations index to
  match (#​4916)

Documentation

• Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  (#​5063)
• Note in the editor integrations that the SublimeText sublack plugin is archived and
  unmaintained (#​5082)

v26.3.1

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Stable style

• Prevent Jupyter notebook magic masking collisions from corrupting cells by using
  exact-length placeholders for short magics and aborting if a placeholder can no longer
  be unmasked safely (#​5038)

Configuration

• Always hash cache filename components derived from --python-cell-magics so custom
  magic names cannot affect cache paths (#​5038)

Blackd

• Disable browser-originated requests by default, add configurable origin allowlisting
  and request body limits, and bound executor submissions to improve backpressure
  (#​5039)

v26.3.0

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Stable style

• Don't double-decode input, causing non-UTF-8 files to be corrupted (#​4964)
• Fix crash on standalone comment in lambda default arguments (#​4993)
• Preserve parentheses when # type: ignore comments would be merged with other
  comments on the same line, preventing AST equivalence failures (#​4888)

Preview style

• Fix bug where if guards in case blocks were incorrectly split when the pattern had
  a trailing comma (#​4884)
• Fix string_processing crashing on unassigned long string literals with trailing
  commas (one-item tuples) (#​4929)
• Simplify implementation of the power operator "hugging" logic (#​4918)

Packaging

• Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in
  frozen environments (#​4930)

Performance

• Introduce winloop for windows as an alternative to uvloop (#​4996)
• Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop()
  (#​4996)
• Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop
  installation and creation of either a uvloop/winloop eventloop or default eventloop
  (#​4996)

Output

• Emit a clear warning when the target Python version is newer than the running Python
  version, since AST safety checks cannot parse newer syntax. Also replace the
  misleading "INTERNAL ERROR" message with an actionable error explaining the version
  mismatch (#​4983)

Blackd

• Introduce winloop to be used when windows in use which enables blackd to run faster on
  windows when winloop is installed. (#​4996)

Integrations

• Remove unused gallery script (#​5030)
• Harden parsing of black requirements in the GitHub Action when use_pyproject is
  enabled so that only version specifiers are accepted and direct references such as
  black @ https://... are rejected. Users should upgrade to the latest version of the
  action as soon as possible. This update is received automatically when using
  psf/black@stable, and is independent of the version of Black installed by the
  action. (#​5031)

Documentation

• Expand preview style documentation with detailed examples for wrap_comprehension_in,
  simplify_power_operator_hugging, and wrap_long_dict_values_in_parens features
  (#​4987)
• Add detailed documentation for formatting Jupyter Notebooks (#​5009)

v26.1.0

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Highlights

Introduces the 2026 stable style (#​4892), stabilizing the following changes:

• always_one_newline_after_import: Always force one blank line after import
  statements, except when the line after the import is a comment or an import statement
  (#​4489)
• fix_fmt_skip_in_one_liners: Fix # fmt: skip behavior on one-liner declarations,
  such as def foo(): return "mock" # fmt: skip, where previously the declaration would
  have been incorrectly collapsed (#​4800)
• fix_module_docstring_detection: Fix module docstrings being treated as normal
  strings if preceded by comments (#​4764)
• fix_type_expansion_split: Fix type expansions split in generic functions (#​4777)
• multiline_string_handling: Make expressions involving multiline strings more compact
  (#​1879)
• normalize_cr_newlines: Add \r style newlines to the potential newlines to
  normalize file newlines both from and to (#​4710)
• remove_parens_around_except_types: Remove parentheses around multiple exception
  types in except and except* without as (#​4720)
• remove_parens_from_assignment_lhs: Remove unnecessary parentheses from the left-hand
  side of assignments while preserving magic trailing commas and intentional multiline
  formatting (#​4865)
• standardize_type_comments: Format type comments which have zero or more spaces
  between # and type: or between type: and value to # type: (value) (#​4645)

The following change was not in any previous stable release:

• Regenerated the _width_table.py and added tests for the Khmer language (#​4253)

This release also bumps pathspec to v1 and fixes inconsistencies with Git's
.gitignore logic (#​4958). Now, files will be ignored if a pattern matches them, even
if the parent directory is directly unignored. For example, Black would previously
format exclude/not_this/foo.py with this .gitignore:

exclude/
!exclude/not_this/

Now, exclude/not_this/foo.py will remain ignored. To ensure exclude/not_this/ and
all of its children are included in formatting (and in Git), use this .gitignore:

*/exclude/*
!*/exclude/not_this/

This new behavior matches Git. The leading */ are only necessary if you wish to ignore
matching subdirectories (like the previous behavior did), and not just matching root
directories.

Output

• Explicitly shutdown the multiprocessing manager when run in diff mode too (#​4952)

Integrations

• Upgraded PyPI upload workflow to use Trusted Publishing (#​4611)

v25.12.0

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Highlights

• Black no longer supports running with Python 3.9 (#​4842)

Stable style

• Fix bug where comments preceding # fmt: off/# fmt: on blocks were incorrectly
  removed, particularly affecting Jupytext's # %% [markdown] comments (#​4845)
• Fix crash when multiple # fmt: skip comments are used in a multi-part if-clause, on
  string literals, or on dictionary entries with long lines (#​4872)
• Fix possible crash when fmt: directives aren't on the top level (#​4856)

Preview style

• Fix fmt: skip skipping the line after instead of the line it's on (#​4855)
• Remove unnecessary parentheses from the left-hand side of assignments while preserving
  magic trailing commas and intentional multiline formatting (#​4865)
• Fix fix_fmt_skip_in_one_liners crashing on with statements (#​4853)
• Fix fix_fmt_skip_in_one_liners crashing on annotated parameters (#​4854)
• Fix new lines being added after imports with # fmt: skip on them (#​4894)

Packaging

• Releases now include arm64 Windows binaries and wheels (#​4814)

Integrations

• Add output-file input to GitHub Action psf/black to write formatter output to a
  file for artifact capture and log cleanliness (#​4824)

v25.11.0

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Highlights

• Enable base 3.14 support (#​4804)
• Add support for the new Python 3.14 t-string syntax introduced by PEP 750 (#​4805)

Stable style

• Fix bug where comments between # fmt: off and # fmt: on were reformatted (#​4811)
• Comments containing fmt directives now preserve their exact formatting instead of
  being normalized (#​4811)

Preview style

• Move multiline_string_handling from --unstable to --preview (#​4760)
• Fix bug where module docstrings would be treated as normal strings if preceded by
  comments (#​4764)
• Fix bug where python 3.12 generics syntax split line happens weirdly (#​4777)
• Standardize type comments to form # type: <value> (#​4645)
• Fix fix_fmt_skip_in_one_liners preview feature to respect # fmt: skip for compound
  statements with semicolon-separated bodies (#​4800)

Configuration

• Add no_cache option to control caching behavior. (#​4803)

Packaging

• Releases now include arm64 Linux binaries (#​4773)

Output

• Write unchanged content to stdout when excluding formatting from stdin using pipes
  (#​4610)

Blackd

• Implemented BlackDClient. This simple python client allows to easily send formatting
  requests to blackd (#​4774)

Integrations

• Enable 3.14 base CI (#​4804)
• Enhance GitHub Action psf/black to support the required-version major-version-only
  "stability" format when using pyproject.toml (#​4770)
• Improve error message for vim plugin users. It now handles independently vim version
• Vim: Warn on unsupported Vim and Python versions independently (#​4772)
• Vim: Print the import paths when importing black fails (#​4675)
• Vim: Fix handling of virtualenvs that have a different Python version (#​4675)

v25.9.0

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Highlights

• Remove support for pre-python 3.7 await/async as soft keywords/variable names
  (#​4676)

Stable style

• Fix crash while formatting a long del statement containing tuples (#​4628)
• Fix crash while formatting expressions using the walrus operator in complex with
  statements (#​4630)
• Handle # fmt: skip followed by a comment at the end of file (#​4635)
• Fix crash when a tuple appears in the as clause of a with statement (#​4634)
• Fix crash when tuple is used as a context manager inside a with statement (#​4646)
• Fix crash when formatting a \ followed by a \r followed by a comment (#​4663)
• Fix crash on a \\r\n (#​4673)
• Fix crash on await ... (where ... is a literal Ellipsis) (#​4676)
• Fix crash on parenthesized expression inside a type parameter bound (#​4684)
• Fix crash when using line ranges excluding indented single line decorated items
  (#​4670)

Preview style

• Fix a bug where one-liner functions/conditionals marked with # fmt: skip would still
  be formatted (#​4552)
• Improve multiline_string_handling with ternaries and dictionaries (#​4657)
• Fix a bug where string_processing would not split f-strings directly after
  expressions (#​4680)
• Wrap the in clause of comprehensions across lines if necessary (#​4699)
• Remove parentheses around multiple exception types in except and except* without
  as. (#​4720)
• Add \r style newlines to the potential newlines to normalize file newlines both from
  and to (#​4710)

Parser

• Rewrite tokenizer to improve performance and compliance (#​4536)
• Fix bug where certain unusual expressions (e.g., lambdas) were not accepted in type
  parameter bounds and defaults. (#​4602)

Performance

• Avoid using an extra process when running with only one worker (#​4734)

Integrations

• Fix the version check in the vim file to reject Python 3.8 (#​4567)
• Enhance GitHub Action psf/black to read Black version from an additional section in
  pyproject.toml: [project.dependency-groups] (#​4606)
• Build gallery docker image with python3-slim and reduce image size (#​4686)

Documentation

• Add FAQ entry for windows emoji not displaying (#​4714)

v25.1.0

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Highlights

This release introduces the new 2025 stable style (#​4558), stabilizing the following
changes:

• Normalize casing of Unicode escape characters in strings to lowercase (#​2916)
• Fix inconsistencies in whether certain strings are detected as docstrings (#​4095)
• Consistently add trailing commas to typed function parameters (#​4164)
• Remove redundant parentheses in if guards for case blocks (#​4214)
• Add parentheses to if clauses in case blocks when the line is too long (#​4269)
• Whitespace before # fmt: skip comments is no longer normalized (#​4146)
• Fix line length computation for certain expressions that involve the power operator
  (#​4154)
• Check if there is a newline before the terminating quotes of a docstring (#​4185)
• Fix type annotation spacing between * and more complex type variable tuple (#​4440)

The following changes were not in any previous release:

• Remove parentheses around sole list items (#​4312)
• Generic function definitions are now formatted more elegantly: parameters are split
  over multiple lines first instead of type parameter definitions (#​4553)

Stable style

• Fix formatting cells in IPython notebooks with magic methods and starting or trailing
  empty lines (#​4484)
• Fix crash when formatting with statements containing tuple generators/unpacking
  (#​4538)

Preview style

• Fix/remove string merging changing f-string quotes on f-strings with internal quotes
  (#​4498)
• Collapse multiple empty lines after an import into one (#​4489)
• Prevent string_processing and wrap_long_dict_values_in_parens from removing
  parentheses around long dictionary values (#​4377)
• Move wrap_long_dict_values_in_parens from the unstable to preview style (#​4561)

Packaging

• Store license identifier inside the License-Expression metadata field, see
  PEP 639. (#​4479)

Performance

• Speed up the is_fstring_start function in Black's tokenizer (#​4541)

Integrations

• If using stdin with --stdin-filename set to a force excluded path, stdin won't be
  formatted. (#​4539)

v24.10.0

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Highlights

• Black is now officially tested with Python 3.13 and provides Python 3.13
  mypyc-compiled wheels. (#​4436) (#​4449)
• Black will issue an error when used with Python 3.12.5, due to an upstream memory
  safety issue in Python 3.12.5 that can cause Black's AST safety checks to fail. Please
  use Python 3.12.6 or Python 3.12.4 instead. (#​4447)
• Black no longer supports running with Python 3.8 (#​4452)

Stable style

• Fix crashes involving comments in parenthesised return types or X | Y style unions.
  (#​4453)
• Fix skipping Jupyter cells with unknown %% magic (#​4462)

Preview style

• Fix type annotation spacing between * and more complex type variable tuple (i.e.
  def fn(*args: *tuple[*Ts, T]) -> None: pass) (#​4440)

Caching

• Fix bug where the cache was shared between runs with and without --unstable (#​4466)

Packaging

• Upgrade version of mypyc used to 1.12 beta (#​4450) (#​4449)
• blackd now requires a newer version of aiohttp. (#​4451)

Output

• Added Python target version information on parse error (#​4378)
• Add information about Black version to internal error messages (#​4457)

v24.8.0

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Stable style

• Fix crash when # fmt: off is used before a closing parenthesis or bracket. (#​4363)

Packaging

• Packaging metadata updated: docs are explicitly linked, the issue tracker is now also
  linked. This improves the PyPI listing for Black. (#​4345)

Parser

• Fix regression where Black failed to parse a multiline f-string containing another
  multiline string (#​4339)
• Fix regression where Black failed to parse an escaped single quote inside an f-string
  (#​4401)
• Fix bug with Black incorrectly parsing empty lines with a backslash (#​4343)
• Fix bugs with Black's tokenizer not handling \{ inside f-strings very well (#​4422)
• Fix incorrect line numbers in the tokenizer for certain tokens within f-strings
  (#​4423)

Performance

• Improve performance when a large directory is listed in .gitignore (#​4415)

Blackd

• Fix blackd (and all extras installs) for docker container (#​4357)

v24.4.2

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This is a bugfix release to fix two regressions in the new f-string parser introduced in
24.4.1.

Parser

• Fix regression where certain complex f-strings failed to parse (#​4332)

Performance

• Fix bad performance on certain complex string literals (#​4331)

v24.4.1

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Highlights

• Add support for the new Python 3.12 f-string syntax introduced by PEP 701 (#​3822)

Stable style

• Fix crash involving indented dummy functions containing newlines (#​4318)

Parser

• Add support for type parameter defaults, a new syntactic feature added to Python 3.13
  by PEP 696 (#​4327)

Integrations

• Github Action now works even when git archive is skipped (#​4313)

v24.4.0

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Stable style

• Fix unwanted crashes caused by AST equivalency check (#​4290)

Preview style

• if guards in case blocks are now wrapped in parentheses when the line is too long.
  (#​4269)
• Stop moving multiline strings to a new line unless inside brackets (#​4289)

Integrations

• Add a new option use_pyproject to the GitHub Action psf/black. This will read the
  Black version from pyproject.toml. (#​4294)

v24.3.0

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Highlights

This release is a milestone: it fixes Black's first CVE security vulnerability. If you
run Black on untrusted input, or if you habitually put thousands of leading tab
characters in your docstrings, you are strongly encouraged to upgrade immediately to fix
CVE-2024-21503.

This release also fixes a bug in Black's AST safety check that allowed Black to make
incorrect changes to certain f-strings that are valid in Python 3.12 and higher.

Stable style

• Don't move comments along with delimiters, which could cause crashes (#​4248)
• Strengthen AST safety check to catch more unsafe changes to strings. Previous versions
  of Black would incorrectly format the contents of certain unusual f-strings containing
  nested strings with the same quote type. Now, Black will crash on such strings until
  support for the new f-string syntax is implemented. (#​4270)
• Fix a bug where line-ranges exceeding the last code line would not work as expected
  (#​4273)

Performance

• Fix catastrophic performance on docstrings that contain large numbers of leading tab
  characters. This fixes
  CVE-2024-21503.
  (#​4278)

Documentation

• Note what happens when --check is used with --quiet (#​4236)

v24.2.0

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Stable style

• Fixed a bug where comments where mistakenly removed along with redundant parentheses
  (#​4218)

Preview style

• Move the hug_parens_with_braces_and_square_brackets feature to the unstable style
  due to an outstanding crash and proposed formatting tweaks (#​4198)
• Fixed a bug where base expressions caused inconsistent formatting of ** in ternary
  expression (#​4154)
• Checking for newline before adding one on docstring that is almost at the line limit
  (#​4185)
• Remove redundant parentheses in case statement if guards (#​4214).

Configuration

• Fix issue where Black would ignore input files in the presence of symlinks (#​4222)
• Black now ignores pyproject.toml that is missing a tool.black section when
  discovering project root and configuration. Since Black continues to use version
  control as an indicator of project root, this is expected to primarily change behavior
  for users in a monorepo setup (desirably). If you wish to preserve previous behavior,
  simply add an empty [tool.black] to the previously discovered pyproject.toml
  (#​4204)

Output

• Black will swallow any SyntaxWarnings or DeprecationWarnings produced by the ast
  module when performing equivalence checks (#​4189)

Integrations

• Add a JSONSchema and provide a validate-pyproject entry-point (#​4181)

v24.1.1

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Bugfix release to fix a bug that made Black unusable on certain file systems with strict
limits on path length.

Preview style

• Consistently add trailing comma on typed parameters (#​4164)

Configuration

• Shorten the length of the name of the cache file to fix crashes on file systems that
  do not support long paths (#​4176)

v24.1.0

Compare Source

Highlights

This release introduces the new 2024 stable style (#​4106), stabilizing the following
changes:

• Add parentheses around if-else expressions (#​2278)
• Dummy class and function implementations consisting only of ... are formatted more
  compactly (#​3796)
• If an assignment statement is too long, we now prefer splitting on the right-hand side
  (#​3368)
• Hex codes in Unicode escape sequences are now standardized to lowercase (#​2916)
• Allow empty first lines at the beginning of most blocks (#​3967, #​4061)
• Add parentheses around long type annotations (#​3899)
• Enforce newline after module docstrings (#​3932, #​4028)
• Fix incorrect magic trailing comma handling in return types (#​3916)
• Remove blank lines before class docstrings (#​3692)
• Wrap multiple context managers in parentheses if combined in a single with statement
  (#​3489)
• Fix bug in line length calculations for power operations (#​3942)
• Add trailing commas to collection literals even if there's a comment after the last
  entry (#​3393)
• When using --skip-magic-trailing-comma or -C, trailing commas are stripped from
  subscript expressions with more than 1 element (#​3209)
• Add extra blank lines in stubs in a few cases (#​3564, #​3862)
• Accept raw strings as docstrings (#​3947)
• Split long lines in case blocks (#​4024)
• Stop removing spaces from walrus operators within subscripts (#​3823)
• Fix incorrect formatting of certain async statements (#​3609)
• Allow combining # fmt: skip with other comments (#​3959)

There are already a few improvements in the --preview style, which are slated for the
2025 stable style. Try them out and
share your feedback. In the past, the preview
style has included some features that we were not able to stabilize. This year, we're
adding a separate --unstable style for features with known problems. Now, the
--preview style only includes features that we actually expect to make it into next
year's stable style.

Stable style

Several bug fixes were made in features that are moved to the stable style in this
release:

• Fix comment handling when parenthesising conditional expressions (#​4134)
• Fix bug where spaces were not added around parenthesized walruses in subscripts,
  unlike other binary operators (#​4109)
• Remove empty lines before docstrings in async functions (#​4132)
• Address a missing case in the change to allow empty lines at the beginning of all
  blocks, except immediately before a docstring (#​4130)
• For stubs, fix logic to enforce empty line after nested classes with bodies (#​4141)

Preview style

• Add --unstable style, covering preview features that have known problems that would
  block them from going into the stable style. Also add the --enable-unstable-feature
  flag; for example, use
  --enable-unstable-feature hug_parens_with_braces_and_square_brackets to apply this
  preview feature throughout 2024, even if a later Black release downgrades the feature
  to unstable (#​4096)
• Format module docstrings the same as class and function docstrings (#​4095)
• Fix crash when using a walrus in a dictionary (#​4155)
• Fix unnecessary parentheses when wrapping long dicts (#​4135)
• Stop normalizing spaces before # fmt: skip comments (#​4146)

Configuration

• Print warning when configuration in pyproject.toml contains an invalid key (#​4165)
• Fix symlink handling, properly ignoring symlinks that point outside of root (#​4161)
• Fix cache mtime logic that resulted in false positive cache hits (#​4128)
• Remove the long-deprecated --experimental-string-processing flag. This feature can
  currently be enabled with --preview --enable-unstable-feature string_processing.
  (#​4096)

Integrations

• Revert the change to run Black's pre-commit integration only on specific git hooks
  (#​3940) for better compatibility with older versions of pre-commit (#​4137)

v23.12.1

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Packaging

• Fixed a bug that included dependencies from the d extra by default (#​4108)

v23.12.0

Compare Source

Highlights

It's almost 2024, which means it's time for a new edition of Black's stable style!
Together with this release, we'll put out an alpha release 24.1a1 showcasing the draft
2024 stable style, which we'll finalize in the January release. Please try it out and
share your feedback.

This release (23.12.0) will still produce the 2023 style. Most but not all of the
changes in --preview mode will be in the 2024 stable style.

Stable style

• Fix bug where # fmt: off automatically dedents when used with the --line-ranges
  option, even when it is not within the specified line range. (#​4084)
• Fix feature detection for parenthesized context managers (#​4104)

Preview style

• Prefer more equal signs before a break when splitting chained assignments (#​4010)
• Standalone form feed characters at the module level are no longer removed (#​4021)
• Additional cases of immediately nested tuples, lists, and dictionaries are now
  indented less (#​4012)
• Allow empty lines at the beginning of all blocks, except immediately before a
  docstring (#​4060)
• Fix crash in preview mode when using a short --line-length (#​4086)
• Keep suites consisting of only an ellipsis on their own lines if they are not
  functions or class definitions (#​4066) (#​4103)

Configuration

• --line-ranges now skips Black's internal stability check in --safe mode. This
  avoids a crash on rare inputs that have many unformatted same-content lines. (#​4034)

Packaging

• Upgrade to mypy 1.7.1 (#​4049) (#​4069)
• Faster compiled wheels are now available for CPython 3.12 (#​4070)

Integrations

• Enable 3.12 CI (#​4035)
• Build docker images in parallel (#​4054)
• Build docker images with 3.12 (#​4055)

v23.11.0

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Highlights

• Support formatting ranges of lines with the new --line-ranges command-line option
  (#​4020)

Stable style

• Fix crash on formatting bytes strings that look like docstrings (#​4003)
• Fix crash when whitespace followed a backslash before newline in a docstring (#​4008)
• Fix standalone comments inside complex blocks crashing Black (#​4016)
• Fix crash on formatting code like await (a ** b) (#​3994)
• No longer treat leading f-strings as docstrings. This matches Python's behaviour and
  fixes a crash (#​4019)

Preview style

• Multiline dicts and lists that are the sole argument to a function are now indented
  less (#​3964)
• Multiline unpacked dicts and lists as the sole argument to a function are now also
  indented less (#​3992)
• In f-string debug expressions, quote types that are visible in the final string are
  now preserved (#​4005)
• Fix a bug where long case blocks were not split into multiple lines. Also enable
  general trailing comma rules on case blocks (#​4024)
• Keep requiring two empty lines between module-level docstring and first function or
  class definition (#​4028)
• Add support for single-line format skip with other comments on the same line (#​3959)

Configuration

• Consistently apply force exclusion logic before resolving symlinks (#​4015)
• Fix a bug in the matching of absolute path names in --include (#​3976)

Performance

• Fix mypyc builds on arm64 on macOS (#​4017)

Integrations

• Black's pre-commit integration will now run only on git hooks appropriate for a code
  formatter (#​3940)

v23.10.1

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Highlights

• Maintenance release to get a fix out for GitHub Action edge case (#​3957)

Preview style

• Fix merging implicit multiline strings that have inline comments (#​3956)
• Allow empty first line after block open before a comment or compound statement (#​3967)

Packaging

• Change Dockerfile to hatch + compile black (#​3965)

Integrations

• The summary output for GitHub workflows is now suppressible using the summary
  parameter. (#​3958)
• Fix the action failing when Black check doesn't pass (#​3957)

Documentation

• It is known Windows documentation CI is broken
  #​3968

v23.10.0

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Stable style

• Fix comments getting removed from inside parenthesized strings (#​3909)

Preview style

• Fix long lines with power operators getting split before the line length (#​3942)
• Long type hints are now wrapped in parentheses and properly indented when split across
  multiple lines (#​3899)
• Magic trailing commas are now respected in return types. (#​3916)
• Require one empty line after module-level docstrings. (#​3932)
• Treat raw triple-quoted strings as docstrings (#​3947)

Configuration

• Fix cache versioning logic when BLACK_CACHE_DIR is set (#​3937)

Parser

• Fix bug where attributes named type were not accepted inside match statements
  (#​3950)
• Add support for PEP 695 type aliases containing lambdas and other unusual expressions
  (#​3949)

Output

• Black no longer attempts to provide special errors for attempting to format Python 2
  code (#​3933)
• Black will more consistently print stacktraces on internal errors in verbose mode
  (#​3938)

Integrations

• The action output displayed in the job summary is now wrapped in Markdown (#​3914)

v23.9.1

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Due to various issues, the previous release (23.9.0) did not include compiled mypyc
wheels, which make Black significantly faster. These issues have now been fixed, and
this release should come with compiled wheels once again.

There will be no wheels for Python 3.12 due to a bug in mypyc. We will provide 3.12
wheels in a future release as soon as the mypyc bug is fixed.

Packaging

• Upgrade to mypy 1.5.1 (#​3864)

Performance

• Store raw tuples instead of NamedTuples in Black's cache, improving performance and
  decreasing the size of the cache (#​3877)

v23.9.0

Compare Source

Preview style

• More concise formatting for dummy implementations (#​3796)
• In stub files, add a blank line between a statement with a body (e.g an
  if sys.version_info > (3, x):) and a function definition on the same level (#​3862)
• Fix a bug whereby spaces were removed from walrus operators within subscript(#​3823)

Configuration

• Black now applies exclusion and ignore logic before resolving symlinks (#​3846)

Performance

• Avoid importing IPython if notebook cells do not contain magics (#​3782)
• Improve caching by comparing file hashes as fallback for mtime and size (#​3821)

Blackd

• Fix an issue in blackd with single character input (#​3558)

Integrations

• Black now has an
  official pre-commit mirror. Swapping
  https://github.com/psf/black to https://github.com/psf/black-pre-commit-mirror in
  your .pre-commit-config.yaml will make Black about 2x faster (#​3828)
• The .black.env folder specified by ENV_PATH will now be removed on the completion
  of the GitHub Action (#​3759)

v23.7.0

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Highlights

• Runtime support for Python 3.7 has been removed. Formatting 3.7 code will still be
  supported until further notice (#​3765)

Stable style

• Fix a bug where an illegal trailing comma was added to return type annotations using
  PEP 604 unions (#​3735)
• Fix several bugs and crashes where comments in stub files were removed or mishandled
  under some circumstances (#​3745)
• Fix a crash with multi-line magic comments like type: ignore within parentheses
  (#​3740)
• Fix error in AST validation when Black removes trailing whitespace in a type comment
  (#​3773)

Preview style

• Implicitly concatenated strings used as function args are no longer wrapped inside
  parentheses (#​3640)
• Remove blank lines between a class definition and its docstring (#​3692)

Configuration

• The --workers argument to Black can now be specified via the BLACK_NUM_WORKERS
  environment variable (#​3743)
• .pytest_cache, .ruff_cache and .vscode are now excluded by default (#​3691)
• Fix Black not honouring pyproject.toml settings when running --stdin-filename
  and the pyproject.toml found isn't in the current working directory (#​3719)
• Black will now error if exclude and extend-exclude have invalid data types in
  pyproject.toml, instead of silently doing the wrong thing (#​3764)

Packaging

• Upgrade mypyc from 0.991 to 1.3 (#​3697)
• Remove patching of Click that mitigated errors on Python 3.6 with LANG=C (#​3768)

Parser

• Add support for the new PEP 695 syntax in Python 3.12 (#​3703)

Performance

• Speed up Black significantly when the cache is full (#​3751)
• Avoid importing IPython in a case where we wouldn't need it (#​3748)

Output

• Use aware UTC datetimes internally, avoids deprecation warning on Python 3.12 (#​3728)
• Change verbose logging to exactly mirror Black's logic for source discovery (#​3749)

Blackd

• The blackd argument parser now shows the default values for options in their help
  text (#​3712)

Integrations

• Black is now tested with
  PYTHONWARNDEFAULTENCODING = 1
  (#​3763)
• Update GitHub Action to display black output in the job summary (#​3688)

Documentation

• Add a CITATION.cff file to the root of the repository, containing metadata on how to
  cite this software (#​3723)
• Update the classes and exceptions documentation in Developer reference to match
  the latest code base (#​3755)

v23.3.0

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Highlights

This release fixes a longstanding confusing behavior in Black's GitHub action, where the
version of the action did not determine the version of Black being run (issue #​3382). In
addition, there is a small bug fix around imports and a number of improvements to the
preview style.

Please try out the
preview style
with black --preview and tell us your feedback. All changes in the preview style are
expected to become part of Black's stable style in January 2024.

Stable style

• Import lines with # fmt: skip and # fmt: off no longer have an extra blank line
  added when they are right after another import line (#​3610)

Preview style

• Add trailing commas to collection literals even if there's a comment after the last
  entry (#​3393)
• async def, async for, and async with statements are now formatted consistently
  compared to their non-async version. (#​3609)
• with statements that contain two context managers will be consistently wrapped in
  parentheses (#​3589)
• Let string splitters respect East Asian Width
  (#​3445)
• Now long string literals can be split after East Asian commas and periods (、 U+3001
  IDEOGRAPHIC COMMA, 。 U+3002 IDEOGRAPHIC FULL STOP, & ， U+FF0C FULLWIDTH COMMA)
  besides before spaces (#​3445)
• For stubs, enforce one blank line after a nested class with a body other than just
  ... (#​3564)
• Improve handling of multiline strings by changing line split behavior (#​1879)

Parser

• Added support for formatting files with invalid type comments (#​3594)

Integrations

• Update GitHub Action to use the version of Black equivalent to action's version if
  version input is not specified (#​3543)
• Fix missing Python binary path in autoload script for vim (#​3508)

Documentation

• Document that only the most recent release is supported for security issues;
  vulnerabilities should be reported through Tidelift (#​3612)

v23.1.0

Compare Source

Highlights

This is the first release of 2023, and following our
stability policy,
it comes with a number of improvements to our stable style, including improvements to
empty line handling, removal of redundant parentheses in several contexts, and output
that highlights implicitly concatenated strings better.

There are also many changes to the preview style; try out black --preview and give us
feedback to help us set the stable style for next year.

In addition to style changes, Black now automatically infers the supported Python
versions from your pyproject.toml file, removing the need to set Black's target
versions separately.

Stable style

• Introduce the 2023 stable style, which incorporates most aspects of last year's
  preview style (#​3418). Specific changes:
  • Enforce empty lines before classes and functions with sticky leading comments
    (#​3302) (22.12.0)
  • Reformat empty and whitespace-only files as either an empty file (if no newline is
    present) or as a single newline character (if a newline is present) (#​3348)
    (22.12.0)
  • Implicitly concatenated strings used as function args are now wrapped inside
    parentheses (#​3307) (22.12.0)
  • Correctly handle trailing commas that are inside a line's leading non-nested parens
    (#​3370) (22.12.0)
  • --skip-string-normalization / -S now prevents docstring prefixes from being
    normalized as expected (#​3168) (since 22.8.0)
  • When using --skip-magic-trailing-comma or -C, trailing commas are stripped from
    subscript expressions with more than 1 element (#​3209) (22.8.0)
  • Implicitly concatenated strings inside a list, set, or tuple are now wrapped inside
    parentheses (#​3162) (22.8.0)
  • Fix a string merging/split issue when a comment is present in the middle of
    implicitly concatenated strings on its own line (#​3227) (22.8.0)
  • Docstring quotes are no longer moved if it would violate the line length limit
    (#​3044, #​3430) (22.6.0)
  • Parentheses around return annotations are now managed (#​2990) (22.6.0)
  • Remove unnecessary parentheses around awaited objects (#​2991) (22.6.0)
  • Remove unnecessary parentheses in with statements (#​2926) (22.6.0)
  • Remove trailing newlines after code block open (#​3035) (22.6.0)
  • Code cell separators #%% are now standardised to # %% (#​2919) (22.3.0)
  • Remove unnecessary parentheses from except statements (#​2939) (22.3.0)
  • Remove unnecessary parentheses from tuple unpacking in for loops (#​2945) (22.3.0)
  • Avoid magic-trailing-comma in single-element subscripts (#​2942) (22.3.0)
• Fix a crash when a colon line is marked between # fmt: off and # fmt: on (#​3439)

Preview style

• Format hex codes in unicode escape sequences in string literals (#​2916)
• Add parentheses around if-else expressions (#​2278)
• Improve performance on large expressions that contain many strings (#​3467)
• Fix a crash in preview style with assert + parenthesized string (#​3415)
• Fix crashes in preview style with walrus operators used in function return annotations
  and except clauses (#​3423)
• Fix a crash in preview advanced string processing where mixed implicitly concatenated
  regular and f-strings start with an empty span (#​3463)
• Fix a crash in preview advanced string processing where a standalone comment is placed
  before a dict's value (#​3469)
• Fix an issue where extra empty lines are added when a decorator has # fmt: skip
  applied or there is a standalone comment between decorators (#​3470)
• Do not put the closing quotes in a docstring on a separate line, even if the line is
  too long (#​3430)
• Long values in dict literals are now wrapped in parentheses; correspondingly
  unnecessary parentheses around short values in dict literals are now removed; long
  string lambda values are now wrapped in parentheses (#​3440)
• Fix two crashes in preview style involving edge cases with docstrings (#​3451)
• Exclude string type annotations from improved string processing; fix crash when the
  return type annotation is stringified and spans across multiple lines (#​3462)
• Wrap multiple context managers in parentheses when targeting Python 3.9+ (#​3489)
• Fix several crashes in preview style with walrus operators used in with statements
  or tuples (#​3473)
• Fix an invalid quote escaping bug in f-string expressions where it produced invalid
  code. Implicitly concatenated f-strings with different quotes can now be merged or
  quote-normalized by changing the quotes used in expressions. (#​3509)
• Fix crash on await (yield) when Black is compiled with mypyc (#​3533)

Configuration

• Black now tries to infer its --target-version from the project metadata specified in
  pyproject.toml (#​3219)

Packaging

• Upgrade mypyc from 0.971 to 0.991 so mypycified Black can be built on armv7
  (#​3380)
  • This also fixes some crashes while using compiled Black with a debug build of
    CPython
• Drop specific support for the tomli requirement on 3.11 alpha releases, working
  around a bug that would cause the requirement not to be installed on any non-final
  Python releases (#​3448)
• Black now depends on packaging version 22.0 or later. This is required for new
  functionality that needs to parse part of the project metadata (#​3219)

Output

• Calling black --help multiple times will return the same help contents each time
  (#​3516)
• Verbose logging now shows the values of pyproject.toml configuration variables
  (#​3392)
• Fix false symlink detection messages in verbose output due to using an incorrect
  relative path to the project root (#​3385)

Integrations

• Move 3.11 CI to normal flow now that all dependencies support 3.11 (#​3446)
• Docker: Add new latest_prerelease tag automation to follow latest black alpha
  release on docker images (#​3465)

Documentation

• Expand vim-plug installation instructions to offer more explicit options (#​3468)

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This PR has been generated by Mend Renovate CLI.

This PR contains the following updates: | Package | Update | Change | |---|---|---| | [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | major | `==22.12.0` → `==26.10.1` | --- ### Release Notes <details> <summary>psf/black (black)</summary> ### [`v26.10.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-26101) [Compare Source](https://github.com/psf/black/compare/26.10.0...26.10.1) ##### Highlights This release fixes a security issue in Black's bundled GitHub Action. Repositories that use the action are encouraged to update to the latest version of Black immediately. This update is received automatically when using `psf/black@stable`, and is independent of the version of Black installed by the action. When the GitHub Action reads version specifiers from `tool.black.required-version`, it now only accepts released versions of Black, as it already did for `black` requirements in dependency lists. Other values, such as URL references, are now rejected. This issue has been registered as `GHSA-cg8m-r9f2-5wm2`; a CVE identifier is pending. ##### Stable style - Fix a long Jupyter notebook assignment magic (for example `x = !ls -la`) being wrapped in parentheses, which IPython can no longer run; such cells are now left unchanged ([#&#8203;5481](https://github.com/psf/black/issues/5481)) - Keep repeated lines outside the selected `--line-ranges` unchanged ([#&#8203;5436](https://github.com/psf/black/issues/5436)) - Fix `--line-ranges` formatting lines that follow a statement when formatting joins or re-indents that statement ([#&#8203;5484](https://github.com/psf/black/issues/5484)) - Fix `--line-ranges` crashing with an internal error when an unselected statement has a `# fmt: skip` comment on the last line before a closing bracket ([#&#8203;5477](https://github.com/psf/black/issues/5477)) - Prevent moving an encoding declaration (for example `# -*- coding: latin-1 -*-`) onto the first two lines of a file ([#&#8203;5487](https://github.com/psf/black/issues/5487)) - Fix adding an extra trailing blank line inside a multi-line module docstring when its last line is near the line length limit ([#&#8203;5494](https://github.com/psf/black/issues/5494)) - Keep the parentheses around a walrus that is the only item in a set (for example `{(x := f())}`) when targeting Python 3.9 or older, since Python 3.8 and 3.9.0 can't parse it without them ([#&#8203;5502](https://github.com/psf/black/issues/5502)) ##### Preview style - Do not split short expressions on delimiters (such as binary operators, comparisons, or comprehensions) inside brackets when preceded by a standalone comment ([#&#8203;5455](https://github.com/psf/black/issues/5455)) - Fix the unstable `string_processing` feature removing backslash-newline sequences from raw strings, which changed their value ([#&#8203;5482](https://github.com/psf/black/issues/5482)) - Avoid adding unnecessary parentheses around unbreakable right-hand side expressions in assignments (such as annotated assignments or subscript targets) ([#&#8203;5473](https://github.com/psf/black/issues/5473)) - Parenthesize expressions with parameter comments when they exceed the line length under `--preview` ([#&#8203;5442](https://github.com/psf/black/issues/5442)) - Fix `wrap_long_dict_values_in_parens` dropping the parentheses around a right-hand side that contains a dictionary, leaving a line over the length limit ([#&#8203;5492](https://github.com/psf/black/issues/5492)) - Fix the unstable `string_processing` feature adding a space after `*` or `**` in a PEP 695 type parameter (`* Ts = ...`) when it splits a string in the parameter's default ([#&#8203;5504](https://github.com/psf/black/issues/5504)) - Avoid unnecessary line splits of trailers (such as indexing/subscripts) when an earlier bracket split exceeds the line length only due to a trailing comment ([#&#8203;5498](https://github.com/psf/black/issues/5498)) ##### Configuration - Add `--cache-dir` to configure the cache directory from the command line ([#&#8203;5433](https://github.com/psf/black/issues/5433)) - Don't cache a file as formatted after formatting or checking it with `--line-ranges`, which made a later full `black --check` pass and `black` skip the unformatted lines ([#&#8203;5476](https://github.com/psf/black/issues/5476)) - Respect a `.gitignore` that starts with a UTF-8 byte order mark. The mark became part of the first pattern, so that pattern never matched and Black formatted files that git ignores ([#&#8203;5497](https://github.com/psf/black/issues/5497)) ##### Performance - Avoid quadratic runtime when splitting very long lines with many trailing bracket pairs (such as consecutive subscripts) ([#&#8203;5475](https://github.com/psf/black/issues/5475)) ##### Integrations - Fix the GitHub Action crashing on dependency-group includes when `use_pyproject` is enabled ([#&#8203;5479](https://github.com/psf/black/issues/5479)) - When the GitHub Action reads version specifiers from `tool.black.required-version`, it now only accepts released versions of Black, as it already did for `black` requirements in dependency lists. Other values, such as URL references, are now rejected. ([#&#8203;5510](https://github.com/psf/black/issues/5510)) ### [`v26.10.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-26100) [Compare Source](https://github.com/psf/black/compare/26.5.1...26.10.0) ##### Stable style - `--line-ranges` no longer inserts an empty line after a docstring when the range covers only the docstring itself ([#&#8203;5312](https://github.com/psf/black/issues/5312)) - Fix `# fmt: skip` on a bracketed ternary turning the surrounding tuple into a call ([#&#8203;5464](https://github.com/psf/black/issues/5464)) - Fix crash when `# fmt: skip` is placed on a one-line function or class with PEP 695 type parameters ([#&#8203;5429](https://github.com/psf/black/issues/5429)) - Fix an inline comment after the closing bracket of optional parentheses being moved inside the parentheses when the parenthesized expression contains own-line comments ([#&#8203;5395](https://github.com/psf/black/issues/5395)) - Fix unparseable output when `# fmt: skip` is placed on a bracket of an `if`, `while`, `for`, or `with` header ([#&#8203;5401](https://github.com/psf/black/issues/5401), [#&#8203;5405](https://github.com/psf/black/issues/5405)) - Fix crash when formatting parenthesized expressions with multiple inline comments and `# fmt: skip` ([#&#8203;5414](https://github.com/psf/black/issues/5414)) - Fix parsing Jupyter notebook assignment magics when non-ASCII characters appear earlier on the line ([#&#8203;5381](https://github.com/psf/black/issues/5381)) - Preserve blank lines that come immediately before a `# fmt: on` comment ([#&#8203;5300](https://github.com/psf/black/issues/5300)) - Keep the parentheses around the target of an annotated assignment (e.g. `(x): int = 5`), which prevent CPython from including the name in `__annotations__` ([#&#8203;5321](https://github.com/psf/black/issues/5321)) - Stop treating a t-string in docstring position as a docstring (e.g. `t" spam "` as the first statement of a module, class or function) ([#&#8203;5287](https://github.com/psf/black/issues/5287)) - Fix unparseable output for a t-string whose replacement field contains a quote (e.g. `t'\'{a["b"]}\''`) ([#&#8203;5265](https://github.com/psf/black/issues/5265)) - Fix unparseable output for a triple-quoted string whose body ends in an already-escaped double quote (e.g. `'''\'''\"'''`) ([#&#8203;5262](https://github.com/psf/black/issues/5262)) - Fix `--skip-magic-trailing-comma` dropping the trailing comma from a split single-element tuple used as a lambda parameter default ([#&#8203;5246](https://github.com/psf/black/issues/5246)) - Fix unstable formatting when an inline comment sits on optional parentheses (e.g. a parenthesized assert message) ([#&#8203;5241](https://github.com/psf/black/issues/5241)) - Fix `--skip-magic-trailing-comma` dropping the trailing comma of a one-element subscript (`a[x,]`) when the line is long enough to be split and contains a power operator ([#&#8203;5272](https://github.com/psf/black/issues/5272)) - Fix crash when a standalone comment sits between tokens of a comprehension or lambda ([#&#8203;5144](https://github.com/psf/black/issues/5144)) - Fix inline comments on a bracket inside a comprehension being dropped ([#&#8203;5330](https://github.com/psf/black/issues/5330)) - Respect the magic trailing comma in a PEP 695 type parameter list containing a `*TypeVarTuple` or `**ParamSpec` ([#&#8203;5244](https://github.com/psf/black/issues/5244)) - Fix crash when a comment-only `# fmt: off`/`# fmt: on` block is followed by a `with` statement after another standalone comment ([#&#8203;5189](https://github.com/psf/black/issues/5189)) - Fix a crash when splitting `case case if ...` match patterns at very small line lengths ([#&#8203;5147](https://github.com/psf/black/issues/5147)) - Fix multiline docstring indentation when leading tabs are used inside indented docstrings ([#&#8203;5148](https://github.com/psf/black/issues/5148)) - Respect `# fmt: skip` on a line that opens a bracket (e.g. `from x import ( # fmt: skip`) when a standalone comment is among the bracket's contents ([#&#8203;5161](https://github.com/psf/black/issues/5161)) - Fix an AST safety error when separate `# type: ignore` comments in a parenthesized attribute chain were merged onto one physical line ([#&#8203;5297](https://github.com/psf/black/issues/5297)) - Preserve comments and blank lines outside requested ranges when formatting with `--line-ranges` ([#&#8203;5175](https://github.com/psf/black/issues/5175)) - Fix crash when `# fmt: skip` is used on one-line `async def`, `async with`, and `async for` statements containing a semicolon ([#&#8203;5311](https://github.com/psf/black/issues/5311)) - Stop converting form feeds or other similar characters in docstrings into newlines ([#&#8203;5461](https://github.com/psf/black/issues/5461)) - Fix `--skip-source-first-line` turning the skipped line's CRLF ending into `\r\r\n` when reformatting a file with CRLF line endings ([#&#8203;5438](https://github.com/psf/black/issues/5438)) ##### Preview style ##### New preview features - Add missing blank lines after classes whose last method has an ellipsis body ([#&#8203;5439](https://github.com/psf/black/issues/5439)) - Split only the brackets holding a magic trailing comma when more trailers follow them (e.g. stop splitting inside the `[2]` of `[1,][2](3)`) ([#&#8203;5448](https://github.com/psf/black/issues/5448)) - Keep dictionary keys containing operators together on one line when the value can be wrapped onto a new line instead ([#&#8203;5435](https://github.com/psf/black/issues/5435)) - Remove redundant parentheses around individual variables in unpacking targets (e.g. `for (x), (y) in points:` becomes `for x, y in points:`) ([#&#8203;5416](https://github.com/psf/black/issues/5416)) - Normalize uppercase `T` prefixes on t-strings to lowercase ([#&#8203;5425](https://github.com/psf/black/issues/5425)) - Remove redundant parentheses around generator expressions ([#&#8203;5304](https://github.com/psf/black/issues/5304), [#&#8203;5369](https://github.com/psf/black/issues/5369)) - Preserve two blank lines before a top-level class starting inside a `# fmt: off` block after an import ([#&#8203;5238](https://github.com/psf/black/issues/5238)) - Fix unnecessary parentheses around short right-hand expressions in indexed assignments (e.g. `x[key] = expr`) ([#&#8203;5095](https://github.com/psf/black/issues/5095)) - Parenthesize tuple expressions in `yield` statements for consistency with function calls and returns ([#&#8203;5170](https://github.com/psf/black/issues/5170)) - Stop splitting between a variable and its operator (`not in`, `==`, `is`, ...) when the right-hand side is a bracketed expression, and instead split inside the brackets ([#&#8203;5135](https://github.com/psf/black/issues/5135)) - In `.pyi` stub files, enforce a blank line after a function or method that has a docstring-only body when another comment or statement follows it ([#&#8203;5158](https://github.com/psf/black/issues/5158)) ##### Updates to existing preview features - Fix crash in stub files when `# fmt: skip` is placed on a function in a group of same-name decorated functions (e.g. `@overload`s or a property setter) ([#&#8203;5430](https://github.com/psf/black/issues/5430)) - Keep the parentheses around a lambda used as the iterable of a comprehension (e.g. `[x for x in (lambda: 0) if x]`) ([#&#8203;5176](https://github.com/psf/black/issues/5176), [#&#8203;5200](https://github.com/psf/black/issues/5200)) ##### Updates to existing unstable features - Do not treat multi-line expressions with merged strings and trailing `# type: ignore` comments as single-line unsplittable expressions ([#&#8203;5466](https://github.com/psf/black/issues/5466)) - Fix duplicated inline comment when stripping the parentheses around a string or merging a backslash-continued string on the same line ([#&#8203;5449](https://github.com/psf/black/issues/5449)) - Split long stringified return annotations even when the function has parameters ([#&#8203;5427](https://github.com/psf/black/issues/5427)) - Don't hug brackets when doing so would join two `# type: ignore` comments onto one line ([#&#8203;5271](https://github.com/psf/black/issues/5271)) - Fix a crash when `# type: ignore` is lost during formatting of a long parenthesized string ([#&#8203;5329](https://github.com/psf/black/issues/5329)) - Fix only the first part of an implicitly concatenated unmergeable string (e.g. `r"..." r"..."`) being wrapped in parentheses ([#&#8203;5434](https://github.com/psf/black/issues/5434)) ##### Configuration - Add support for `NO_COLOR` environment variable to disable ANSI output ([#&#8203;5129](https://github.com/psf/black/issues/5129)) - Remove spurious target version warning when runtime version is included in a `--target-version` flag ([#&#8203;5167](https://github.com/psf/black/issues/5167)) - Fix `--force-exclude` not excluding files whose path contains `..` (e.g. `black ../generated/file.py` run from a subdirectory) ([#&#8203;5471](https://github.com/psf/black/issues/5471)) - Fall back to the default configuration, with a warning, when the given sources share no common project root (e.g. they are on different drives on Windows) instead of crashing ([#&#8203;5386](https://github.com/psf/black/issues/5386)) - Fix loading a stale cached `pyproject.toml` path when `--code` is used from different working directories in the same process ([#&#8203;5152](https://github.com/psf/black/issues/5152)) - Add validation for `--line-ranges` values ([#&#8203;5107](https://github.com/psf/black/issues/5107)) - Ignore empty cache files instead of raising an `EOFError` ([#&#8203;5192](https://github.com/psf/black/issues/5192)) - Reject non-string `include` and `force-exclude` values in `pyproject.toml` ([#&#8203;5193](https://github.com/psf/black/issues/5193)) - Validate `BLACK_NUM_WORKERS` values and report invalid values as usage errors instead of crashing ([#&#8203;5211](https://github.com/psf/black/issues/5211)) - Ignore permission errors when reading cache ([#&#8203;5258](https://github.com/psf/black/issues/5258)) ##### Packaging - Reduce the size of Linux standalone binaries by stripping debug symbols during the PyInstaller release build ([#&#8203;5223](https://github.com/psf/black/issues/5223)) - Black is now released using GitHub [Immutable Releases](https://docs.github.com/code-security/concepts/supply-chain-security/immutable-releases) ([#&#8203;5296](https://github.com/psf/black/issues/5296)) ##### Performance - Fix superlinear runtime growth with the number of input files ([#&#8203;5450](https://github.com/psf/black/issues/5450)) - Improve performance on strings containing many consecutive backslashes ([#&#8203;5163](https://github.com/psf/black/issues/5163)) - Improve performance on files with many `# fmt: skip`/`# fmt: off`/`# fmt: on` comments ([#&#8203;5169](https://github.com/psf/black/issues/5169), [#&#8203;5190](https://github.com/psf/black/issues/5190), [#&#8203;5232](https://github.com/psf/black/issues/5232)) - Improve performance on long calls and collections ([#&#8203;5177](https://github.com/psf/black/issues/5177)) - Improve performance on multiline strings inside large collections (e.g. a dict literal with triple-quoted strings as values) ([#&#8203;5188](https://github.com/psf/black/issues/5188)) - Improve performance on files with many soft keywords (e.g. `match`/`case` blocks) ([#&#8203;5186](https://github.com/psf/black/issues/5186)) - Improve performance on long semicolon-separated statements (in the stable style) and large dict literals (in `--preview`) ([#&#8203;5184](https://github.com/psf/black/issues/5184)) - Improve performance of `--line-ranges` on files with many sibling blocks (a long `if`/`elif` chain, a `match` with many cases, or many top-level definitions) ([#&#8203;5213](https://github.com/psf/black/issues/5213)) - Improve performance on deeply nested bracketed expressions ([#&#8203;5171](https://github.com/psf/black/issues/5171), [#&#8203;5242](https://github.com/psf/black/issues/5242)) - Improve performance on lists and subscripts holding one long expression without operators (e.g. a long run of implicitly concatenated strings inside `[]`) ([#&#8203;5239](https://github.com/psf/black/issues/5239)) - Improve performance on deeply chained operations (e.g. a long `a ** b ** c ** ...` chain) ([#&#8203;5235](https://github.com/psf/black/issues/5235)) - Improve performance on long `if`/`elif` chains and other compound statements with many clauses ([#&#8203;5322](https://github.com/psf/black/issues/5322)) - Improve performance of `string_processing`: - when merging implicitly concatenated f-strings containing long string literals ([#&#8203;5165](https://github.com/psf/black/issues/5165)) - when merging long implicitly concatenated strings ([#&#8203;5173](https://github.com/psf/black/issues/5173), [#&#8203;5194](https://github.com/psf/black/issues/5194)) - when rewriting large nodes (e.g. `"%s ..." % (a, b, c, ...)`) ([#&#8203;5178](https://github.com/psf/black/issues/5178), [#&#8203;5199](https://github.com/psf/black/issues/5199), [#&#8203;5220](https://github.com/psf/black/issues/5220)) - when splitting long string literals ([#&#8203;5183](https://github.com/psf/black/issues/5183)) ##### Output - Report parser failures using editor-friendly `path:line:column` locations ([#&#8203;5237](https://github.com/psf/black/issues/5237)) - Fix crash when writing formatted code or diffs to a `sys.stdout` that has no `buffer` attribute (e.g. in Jupyter notebooks) ([#&#8203;5411](https://github.com/psf/black/issues/5411)) - Report parse failures on Black's own output as internal errors ([#&#8203;5383](https://github.com/psf/black/issues/5383)) ##### *Blackd* - Return HTTP 400 instead of 500 when the `X-Python-Variant` header is empty or has an empty entry (e.g. a trailing comma) ([#&#8203;5428](https://github.com/psf/black/issues/5428)) - Allow optional whitespace around comma-separated versions and `pyi` in the `X-Python-Variant` header ([#&#8203;5441](https://github.com/psf/black/issues/5441)) ##### Integrations - Remove unused `migrate-black` script ([#&#8203;5319](https://github.com/psf/black/issues/5319)) - Support PEP 440 version specifiers in `tool.black.required-version` for the GitHub Action ([#&#8203;5399](https://github.com/psf/black/issues/5399)) - Add outputs (`is_formatted`, `change_count`, `same_count`, `failure_count`) to GitHub Action runs ([#&#8203;5408](https://github.com/psf/black/issues/5408)) ##### Documentation - Document `vim-python-pep8-indent`, which provides an `indentexpr` for Black-style insert-mode indentation ([#&#8203;5288](https://github.com/psf/black/issues/5288)) ### [`v26.5.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2651) [Compare Source](https://github.com/psf/black/compare/26.5.0...26.5.1) ##### Stable style - Fix unstable formatting of annotated assignments whose subscript annotation contains an inline comment (e.g. `x: list[ # pyright: ignore[...]`) ([#&#8203;5130](https://github.com/psf/black/issues/5130)) - Preserve inline comments (including `# type: ignore`) immediately before a `# fmt: skip` line, avoiding AST equivalence failures ([#&#8203;5139](https://github.com/psf/black/issues/5139)) ##### Packaging - Correct the version in the published executables ([#&#8203;5137](https://github.com/psf/black/issues/5137)) ##### Documentation - Add Neovim integration guide covering conform.nvim, ALE, and simple command approaches ([#&#8203;5124](https://github.com/psf/black/issues/5124)) ### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650) [Compare Source](https://github.com/psf/black/compare/26.3.1...26.5.0) ##### Highlights - Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810), both new syntactic features in Python 3.15 ([#&#8203;5048](https://github.com/psf/black/issues/5048)) - Python 3.15 is now supported. Compiled wheels are not yet provided for Python 3.15, so performance may be slower than on existing Python versions. Wheels will be provided once Python 3.15 is later in its release cycle. ([#&#8203;5127](https://github.com/psf/black/issues/5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#&#8203;4903](https://github.com/psf/black/issues/4903)) - Add syntactic support for Python 3.15 ([#&#8203;5048](https://github.com/psf/black/issues/5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](https://github.com/psf/black/issues/5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#&#8203;5117](https://github.com/psf/black/issues/5117)) ##### Preview style - Improve heuristics around whether blank lines should appear before, within and after groups of same-name decorated functions (such as `@overload` groups) in `.pyi` stub files ([#&#8203;5021](https://github.com/psf/black/issues/5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#&#8203;5092](https://github.com/psf/black/issues/5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](https://github.com/psf/black/issues/5096)) ##### Packaging - Run CI on 3.15 ([#&#8203;5127](https://github.com/psf/black/issues/5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#&#8203;5068](https://github.com/psf/black/issues/5068)) - Add `SourceASTParseError` to distinguish source parse failures from internal safety errors, improving error reporting when Black's lenient parser accepts input that `ast.parse()` rejects ([#&#8203;5080](https://github.com/psf/black/issues/5080)) ##### *Blackd* - Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping HTTP 500 only for genuine internal safety errors ([#&#8203;5080](https://github.com/psf/black/issues/5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#&#8203;4916](https://github.com/psf/black/issues/4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#&#8203;5063](https://github.com/psf/black/issues/5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#&#8203;5082](https://github.com/psf/black/issues/5082)) ### [`v26.3.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2631) [Compare Source](https://github.com/psf/black/compare/26.3.0...26.3.1) ##### Stable style - Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely ([#&#8203;5038](https://github.com/psf/black/issues/5038)) ##### Configuration - Always hash cache filename components derived from `--python-cell-magics` so custom magic names cannot affect cache paths ([#&#8203;5038](https://github.com/psf/black/issues/5038)) ##### *Blackd* - Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure ([#&#8203;5039](https://github.com/psf/black/issues/5039)) ### [`v26.3.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2630) [Compare Source](https://github.com/psf/black/compare/26.1.0...26.3.0) ##### Stable style - Don't double-decode input, causing non-UTF-8 files to be corrupted ([#&#8203;4964](https://github.com/psf/black/issues/4964)) - Fix crash on standalone comment in lambda default arguments ([#&#8203;4993](https://github.com/psf/black/issues/4993)) - Preserve parentheses when `# type: ignore` comments would be merged with other comments on the same line, preventing AST equivalence failures ([#&#8203;4888](https://github.com/psf/black/issues/4888)) ##### Preview style - Fix bug where `if` guards in `case` blocks were incorrectly split when the pattern had a trailing comma ([#&#8203;4884](https://github.com/psf/black/issues/4884)) - Fix `string_processing` crashing on unassigned long string literals with trailing commas (one-item tuples) ([#&#8203;4929](https://github.com/psf/black/issues/4929)) - Simplify implementation of the power operator "hugging" logic ([#&#8203;4918](https://github.com/psf/black/issues/4918)) ##### Packaging - Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments ([#&#8203;4930](https://github.com/psf/black/issues/4930)) ##### Performance - Introduce winloop for windows as an alternative to uvloop ([#&#8203;4996](https://github.com/psf/black/issues/4996)) - Remove deprecated function `uvloop.install()` in favor of `uvloop.new_event_loop()` ([#&#8203;4996](https://github.com/psf/black/issues/4996)) - Rename `maybe_install_uvloop` function to `maybe_use_uvloop` to simplify loop installation and creation of either a uvloop/winloop eventloop or default eventloop ([#&#8203;4996](https://github.com/psf/black/issues/4996)) ##### Output - Emit a clear warning when the target Python version is newer than the running Python version, since AST safety checks cannot parse newer syntax. Also replace the misleading "INTERNAL ERROR" message with an actionable error explaining the version mismatch ([#&#8203;4983](https://github.com/psf/black/issues/4983)) ##### *Blackd* - Introduce winloop to be used when windows in use which enables blackd to run faster on windows when winloop is installed. ([#&#8203;4996](https://github.com/psf/black/issues/4996)) ##### Integrations - Remove unused gallery script ([#&#8203;5030](https://github.com/psf/black/issues/5030)) - Harden parsing of `black` requirements in the GitHub Action when `use_pyproject` is enabled so that only version specifiers are accepted and direct references such as `black @ https://...` are rejected. Users should upgrade to the latest version of the action as soon as possible. This update is received automatically when using `psf/black@stable`, and is independent of the version of Black installed by the action. ([#&#8203;5031](https://github.com/psf/black/issues/5031)) ##### Documentation - Expand preview style documentation with detailed examples for `wrap_comprehension_in`, `simplify_power_operator_hugging`, and `wrap_long_dict_values_in_parens` features ([#&#8203;4987](https://github.com/psf/black/issues/4987)) - Add detailed documentation for formatting Jupyter Notebooks ([#&#8203;5009](https://github.com/psf/black/issues/5009)) ### [`v26.1.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2610) [Compare Source](https://github.com/psf/black/compare/25.12.0...26.1.0) ##### Highlights Introduces the 2026 stable style ([#&#8203;4892](https://github.com/psf/black/issues/4892)), stabilizing the following changes: - `always_one_newline_after_import`: Always force one blank line after import statements, except when the line after the import is a comment or an import statement ([#&#8203;4489](https://github.com/psf/black/issues/4489)) - `fix_fmt_skip_in_one_liners`: Fix `# fmt: skip` behavior on one-liner declarations, such as `def foo(): return "mock" # fmt: skip`, where previously the declaration would have been incorrectly collapsed ([#&#8203;4800](https://github.com/psf/black/issues/4800)) - `fix_module_docstring_detection`: Fix module docstrings being treated as normal strings if preceded by comments ([#&#8203;4764](https://github.com/psf/black/issues/4764)) - `fix_type_expansion_split`: Fix type expansions split in generic functions ([#&#8203;4777](https://github.com/psf/black/issues/4777)) - `multiline_string_handling`: Make expressions involving multiline strings more compact ([#&#8203;1879](https://github.com/psf/black/issues/1879)) - `normalize_cr_newlines`: Add `\r` style newlines to the potential newlines to normalize file newlines both from and to ([#&#8203;4710](https://github.com/psf/black/issues/4710)) - `remove_parens_around_except_types`: Remove parentheses around multiple exception types in `except` and `except*` without `as` ([#&#8203;4720](https://github.com/psf/black/issues/4720)) - `remove_parens_from_assignment_lhs`: Remove unnecessary parentheses from the left-hand side of assignments while preserving magic trailing commas and intentional multiline formatting ([#&#8203;4865](https://github.com/psf/black/issues/4865)) - `standardize_type_comments`: Format type comments which have zero or more spaces between `#` and `type:` or between `type:` and value to `# type: (value)` ([#&#8203;4645](https://github.com/psf/black/issues/4645)) The following change was not in any previous stable release: - Regenerated the `_width_table.py` and added tests for the Khmer language ([#&#8203;4253](https://github.com/psf/black/issues/4253)) This release also bumps `pathspec` to v1 and fixes inconsistencies with Git's `.gitignore` logic ([#&#8203;4958](https://github.com/psf/black/issues/4958)). Now, files will be ignored if a pattern matches them, even if the parent directory is directly unignored. For example, Black would previously format `exclude/not_this/foo.py` with this `.gitignore`: ``` exclude/ !exclude/not_this/ ``` Now, `exclude/not_this/foo.py` will remain ignored. To ensure `exclude/not_this/` and all of its children are included in formatting (and in Git), use this `.gitignore`: ``` */exclude/* !*/exclude/not_this/ ``` This new behavior matches Git. The leading `*/` are only necessary if you wish to ignore matching subdirectories (like the previous behavior did), and not just matching root directories. ##### Output - Explicitly shutdown the multiprocessing manager when run in diff mode too ([#&#8203;4952](https://github.com/psf/black/issues/4952)) ##### Integrations - Upgraded PyPI upload workflow to use Trusted Publishing ([#&#8203;4611](https://github.com/psf/black/issues/4611)) ### [`v25.12.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-25120) [Compare Source](https://github.com/psf/black/compare/25.11.0...25.12.0) ##### Highlights - Black no longer supports running with Python 3.9 ([#&#8203;4842](https://github.com/psf/black/issues/4842)) ##### Stable style - Fix bug where comments preceding `# fmt: off`/`# fmt: on` blocks were incorrectly removed, particularly affecting Jupytext's `# %% [markdown]` comments ([#&#8203;4845](https://github.com/psf/black/issues/4845)) - Fix crash when multiple `# fmt: skip` comments are used in a multi-part if-clause, on string literals, or on dictionary entries with long lines ([#&#8203;4872](https://github.com/psf/black/issues/4872)) - Fix possible crash when `fmt: ` directives aren't on the top level ([#&#8203;4856](https://github.com/psf/black/issues/4856)) ##### Preview style - Fix `fmt: skip` skipping the line after instead of the line it's on ([#&#8203;4855](https://github.com/psf/black/issues/4855)) - Remove unnecessary parentheses from the left-hand side of assignments while preserving magic trailing commas and intentional multiline formatting ([#&#8203;4865](https://github.com/psf/black/issues/4865)) - Fix `fix_fmt_skip_in_one_liners` crashing on `with` statements ([#&#8203;4853](https://github.com/psf/black/issues/4853)) - Fix `fix_fmt_skip_in_one_liners` crashing on annotated parameters ([#&#8203;4854](https://github.com/psf/black/issues/4854)) - Fix new lines being added after imports with `# fmt: skip` on them ([#&#8203;4894](https://github.com/psf/black/issues/4894)) ##### Packaging - Releases now include arm64 Windows binaries and wheels ([#&#8203;4814](https://github.com/psf/black/issues/4814)) ##### Integrations - Add `output-file` input to GitHub Action `psf/black` to write formatter output to a file for artifact capture and log cleanliness ([#&#8203;4824](https://github.com/psf/black/issues/4824)) ### [`v25.11.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-25110) [Compare Source](https://github.com/psf/black/compare/25.9.0...25.11.0) ##### Highlights - Enable base 3.14 support ([#&#8203;4804](https://github.com/psf/black/issues/4804)) - Add support for the new Python 3.14 t-string syntax introduced by PEP 750 ([#&#8203;4805](https://github.com/psf/black/issues/4805)) ##### Stable style - Fix bug where comments between `# fmt: off` and `# fmt: on` were reformatted ([#&#8203;4811](https://github.com/psf/black/issues/4811)) - Comments containing fmt directives now preserve their exact formatting instead of being normalized ([#&#8203;4811](https://github.com/psf/black/issues/4811)) ##### Preview style - Move `multiline_string_handling` from `--unstable` to `--preview` ([#&#8203;4760](https://github.com/psf/black/issues/4760)) - Fix bug where module docstrings would be treated as normal strings if preceded by comments ([#&#8203;4764](https://github.com/psf/black/issues/4764)) - Fix bug where python 3.12 generics syntax split line happens weirdly ([#&#8203;4777](https://github.com/psf/black/issues/4777)) - Standardize type comments to form `# type: <value>` ([#&#8203;4645](https://github.com/psf/black/issues/4645)) - Fix `fix_fmt_skip_in_one_liners` preview feature to respect `# fmt: skip` for compound statements with semicolon-separated bodies ([#&#8203;4800](https://github.com/psf/black/issues/4800)) ##### Configuration - Add `no_cache` option to control caching behavior. ([#&#8203;4803](https://github.com/psf/black/issues/4803)) ##### Packaging - Releases now include arm64 Linux binaries ([#&#8203;4773](https://github.com/psf/black/issues/4773)) ##### Output - Write unchanged content to stdout when excluding formatting from stdin using pipes ([#&#8203;4610](https://github.com/psf/black/issues/4610)) ##### *Blackd* - Implemented BlackDClient. This simple python client allows to easily send formatting requests to blackd ([#&#8203;4774](https://github.com/psf/black/issues/4774)) ##### Integrations - Enable 3.14 base CI ([#&#8203;4804](https://github.com/psf/black/issues/4804)) - Enhance GitHub Action `psf/black` to support the `required-version` major-version-only "stability" format when using pyproject.toml ([#&#8203;4770](https://github.com/psf/black/issues/4770)) - Improve error message for vim plugin users. It now handles independently vim version - Vim: Warn on unsupported Vim and Python versions independently ([#&#8203;4772](https://github.com/psf/black/issues/4772)) - Vim: Print the import paths when importing black fails ([#&#8203;4675](https://github.com/psf/black/issues/4675)) - Vim: Fix handling of virtualenvs that have a different Python version ([#&#8203;4675](https://github.com/psf/black/issues/4675)) ### [`v25.9.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2590) [Compare Source](https://github.com/psf/black/compare/25.1.0...25.9.0) ##### Highlights - Remove support for pre-python 3.7 `await/async` as soft keywords/variable names ([#&#8203;4676](https://github.com/psf/black/issues/4676)) ##### Stable style - Fix crash while formatting a long `del` statement containing tuples ([#&#8203;4628](https://github.com/psf/black/issues/4628)) - Fix crash while formatting expressions using the walrus operator in complex `with` statements ([#&#8203;4630](https://github.com/psf/black/issues/4630)) - Handle `# fmt: skip` followed by a comment at the end of file ([#&#8203;4635](https://github.com/psf/black/issues/4635)) - Fix crash when a tuple appears in the `as` clause of a `with` statement ([#&#8203;4634](https://github.com/psf/black/issues/4634)) - Fix crash when tuple is used as a context manager inside a `with` statement ([#&#8203;4646](https://github.com/psf/black/issues/4646)) - Fix crash when formatting a `\` followed by a `\r` followed by a comment ([#&#8203;4663](https://github.com/psf/black/issues/4663)) - Fix crash on a `\\r\n` ([#&#8203;4673](https://github.com/psf/black/issues/4673)) - Fix crash on `await ...` (where `...` is a literal `Ellipsis`) ([#&#8203;4676](https://github.com/psf/black/issues/4676)) - Fix crash on parenthesized expression inside a type parameter bound ([#&#8203;4684](https://github.com/psf/black/issues/4684)) - Fix crash when using line ranges excluding indented single line decorated items ([#&#8203;4670](https://github.com/psf/black/issues/4670)) ##### Preview style - Fix a bug where one-liner functions/conditionals marked with `# fmt: skip` would still be formatted ([#&#8203;4552](https://github.com/psf/black/issues/4552)) - Improve `multiline_string_handling` with ternaries and dictionaries ([#&#8203;4657](https://github.com/psf/black/issues/4657)) - Fix a bug where `string_processing` would not split f-strings directly after expressions ([#&#8203;4680](https://github.com/psf/black/issues/4680)) - Wrap the `in` clause of comprehensions across lines if necessary ([#&#8203;4699](https://github.com/psf/black/issues/4699)) - Remove parentheses around multiple exception types in `except` and `except*` without `as`. ([#&#8203;4720](https://github.com/psf/black/issues/4720)) - Add `\r` style newlines to the potential newlines to normalize file newlines both from and to ([#&#8203;4710](https://github.com/psf/black/issues/4710)) ##### Parser - Rewrite tokenizer to improve performance and compliance ([#&#8203;4536](https://github.com/psf/black/issues/4536)) - Fix bug where certain unusual expressions (e.g., lambdas) were not accepted in type parameter bounds and defaults. ([#&#8203;4602](https://github.com/psf/black/issues/4602)) ##### Performance - Avoid using an extra process when running with only one worker ([#&#8203;4734](https://github.com/psf/black/issues/4734)) ##### Integrations - Fix the version check in the vim file to reject Python 3.8 ([#&#8203;4567](https://github.com/psf/black/issues/4567)) - Enhance GitHub Action `psf/black` to read Black version from an additional section in pyproject.toml: `[project.dependency-groups]` ([#&#8203;4606](https://github.com/psf/black/issues/4606)) - Build gallery docker image with python3-slim and reduce image size ([#&#8203;4686](https://github.com/psf/black/issues/4686)) ##### Documentation - Add FAQ entry for windows emoji not displaying ([#&#8203;4714](https://github.com/psf/black/issues/4714)) ### [`v25.1.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2510) [Compare Source](https://github.com/psf/black/compare/24.10.0...25.1.0) ##### Highlights This release introduces the new 2025 stable style ([#&#8203;4558](https://github.com/psf/black/issues/4558)), stabilizing the following changes: - Normalize casing of Unicode escape characters in strings to lowercase ([#&#8203;2916](https://github.com/psf/black/issues/2916)) - Fix inconsistencies in whether certain strings are detected as docstrings ([#&#8203;4095](https://github.com/psf/black/issues/4095)) - Consistently add trailing commas to typed function parameters ([#&#8203;4164](https://github.com/psf/black/issues/4164)) - Remove redundant parentheses in if guards for case blocks ([#&#8203;4214](https://github.com/psf/black/issues/4214)) - Add parentheses to if clauses in case blocks when the line is too long ([#&#8203;4269](https://github.com/psf/black/issues/4269)) - Whitespace before `# fmt: skip` comments is no longer normalized ([#&#8203;4146](https://github.com/psf/black/issues/4146)) - Fix line length computation for certain expressions that involve the power operator ([#&#8203;4154](https://github.com/psf/black/issues/4154)) - Check if there is a newline before the terminating quotes of a docstring ([#&#8203;4185](https://github.com/psf/black/issues/4185)) - Fix type annotation spacing between `*` and more complex type variable tuple ([#&#8203;4440](https://github.com/psf/black/issues/4440)) The following changes were not in any previous release: - Remove parentheses around sole list items ([#&#8203;4312](https://github.com/psf/black/issues/4312)) - Generic function definitions are now formatted more elegantly: parameters are split over multiple lines first instead of type parameter definitions ([#&#8203;4553](https://github.com/psf/black/issues/4553)) ##### Stable style - Fix formatting cells in IPython notebooks with magic methods and starting or trailing empty lines ([#&#8203;4484](https://github.com/psf/black/issues/4484)) - Fix crash when formatting `with` statements containing tuple generators/unpacking ([#&#8203;4538](https://github.com/psf/black/issues/4538)) ##### Preview style - Fix/remove string merging changing f-string quotes on f-strings with internal quotes ([#&#8203;4498](https://github.com/psf/black/issues/4498)) - Collapse multiple empty lines after an import into one ([#&#8203;4489](https://github.com/psf/black/issues/4489)) - Prevent `string_processing` and `wrap_long_dict_values_in_parens` from removing parentheses around long dictionary values ([#&#8203;4377](https://github.com/psf/black/issues/4377)) - Move `wrap_long_dict_values_in_parens` from the unstable to preview style ([#&#8203;4561](https://github.com/psf/black/issues/4561)) ##### Packaging - Store license identifier inside the `License-Expression` metadata field, see [PEP 639](https://peps.python.org/pep-0639/). ([#&#8203;4479](https://github.com/psf/black/issues/4479)) ##### Performance - Speed up the `is_fstring_start` function in Black's tokenizer ([#&#8203;4541](https://github.com/psf/black/issues/4541)) ##### Integrations - If using stdin with `--stdin-filename` set to a force excluded path, stdin won't be formatted. ([#&#8203;4539](https://github.com/psf/black/issues/4539)) ### [`v24.10.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-24100) [Compare Source](https://github.com/psf/black/compare/24.8.0...24.10.0) ##### Highlights - Black is now officially tested with Python 3.13 and provides Python 3.13 mypyc-compiled wheels. ([#&#8203;4436](https://github.com/psf/black/issues/4436)) ([#&#8203;4449](https://github.com/psf/black/issues/4449)) - Black will issue an error when used with Python 3.12.5, due to an upstream memory safety issue in Python 3.12.5 that can cause Black's AST safety checks to fail. Please use Python 3.12.6 or Python 3.12.4 instead. ([#&#8203;4447](https://github.com/psf/black/issues/4447)) - Black no longer supports running with Python 3.8 ([#&#8203;4452](https://github.com/psf/black/issues/4452)) ##### Stable style - Fix crashes involving comments in parenthesised return types or `X | Y` style unions. ([#&#8203;4453](https://github.com/psf/black/issues/4453)) - Fix skipping Jupyter cells with unknown `%%` magic ([#&#8203;4462](https://github.com/psf/black/issues/4462)) ##### Preview style - Fix type annotation spacing between \* and more complex type variable tuple (i.e. `def fn(*args: *tuple[*Ts, T]) -> None: pass`) ([#&#8203;4440](https://github.com/psf/black/issues/4440)) ##### Caching - Fix bug where the cache was shared between runs with and without `--unstable` ([#&#8203;4466](https://github.com/psf/black/issues/4466)) ##### Packaging - Upgrade version of mypyc used to 1.12 beta ([#&#8203;4450](https://github.com/psf/black/issues/4450)) ([#&#8203;4449](https://github.com/psf/black/issues/4449)) - `blackd` now requires a newer version of aiohttp. ([#&#8203;4451](https://github.com/psf/black/issues/4451)) ##### Output - Added Python target version information on parse error ([#&#8203;4378](https://github.com/psf/black/issues/4378)) - Add information about Black version to internal error messages ([#&#8203;4457](https://github.com/psf/black/issues/4457)) ### [`v24.8.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2480) [Compare Source](https://github.com/psf/black/compare/24.4.2...24.8.0) ##### Stable style - Fix crash when `# fmt: off` is used before a closing parenthesis or bracket. ([#&#8203;4363](https://github.com/psf/black/issues/4363)) ##### Packaging - Packaging metadata updated: docs are explicitly linked, the issue tracker is now also linked. This improves the PyPI listing for Black. ([#&#8203;4345](https://github.com/psf/black/issues/4345)) ##### Parser - Fix regression where Black failed to parse a multiline f-string containing another multiline string ([#&#8203;4339](https://github.com/psf/black/issues/4339)) - Fix regression where Black failed to parse an escaped single quote inside an f-string ([#&#8203;4401](https://github.com/psf/black/issues/4401)) - Fix bug with Black incorrectly parsing empty lines with a backslash ([#&#8203;4343](https://github.com/psf/black/issues/4343)) - Fix bugs with Black's tokenizer not handling `\{` inside f-strings very well ([#&#8203;4422](https://github.com/psf/black/issues/4422)) - Fix incorrect line numbers in the tokenizer for certain tokens within f-strings ([#&#8203;4423](https://github.com/psf/black/issues/4423)) ##### Performance - Improve performance when a large directory is listed in `.gitignore` ([#&#8203;4415](https://github.com/psf/black/issues/4415)) ##### *Blackd* - Fix blackd (and all extras installs) for docker container ([#&#8203;4357](https://github.com/psf/black/issues/4357)) ### [`v24.4.2`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2442) [Compare Source](https://github.com/psf/black/compare/24.4.1...24.4.2) This is a bugfix release to fix two regressions in the new f-string parser introduced in 24.4.1. ##### Parser - Fix regression where certain complex f-strings failed to parse ([#&#8203;4332](https://github.com/psf/black/issues/4332)) ##### Performance - Fix bad performance on certain complex string literals ([#&#8203;4331](https://github.com/psf/black/issues/4331)) ### [`v24.4.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2441) [Compare Source](https://github.com/psf/black/compare/24.4.0...24.4.1) ##### Highlights - Add support for the new Python 3.12 f-string syntax introduced by PEP 701 ([#&#8203;3822](https://github.com/psf/black/issues/3822)) ##### Stable style - Fix crash involving indented dummy functions containing newlines ([#&#8203;4318](https://github.com/psf/black/issues/4318)) ##### Parser - Add support for type parameter defaults, a new syntactic feature added to Python 3.13 by PEP 696 ([#&#8203;4327](https://github.com/psf/black/issues/4327)) ##### Integrations - Github Action now works even when `git archive` is skipped ([#&#8203;4313](https://github.com/psf/black/issues/4313)) ### [`v24.4.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2440) [Compare Source](https://github.com/psf/black/compare/24.3.0...24.4.0) ##### Stable style - Fix unwanted crashes caused by AST equivalency check ([#&#8203;4290](https://github.com/psf/black/issues/4290)) ##### Preview style - `if` guards in `case` blocks are now wrapped in parentheses when the line is too long. ([#&#8203;4269](https://github.com/psf/black/issues/4269)) - Stop moving multiline strings to a new line unless inside brackets ([#&#8203;4289](https://github.com/psf/black/issues/4289)) ##### Integrations - Add a new option `use_pyproject` to the GitHub Action `psf/black`. This will read the Black version from `pyproject.toml`. ([#&#8203;4294](https://github.com/psf/black/issues/4294)) ### [`v24.3.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2430) [Compare Source](https://github.com/psf/black/compare/24.2.0...24.3.0) ##### Highlights This release is a milestone: it fixes Black's first CVE security vulnerability. If you run Black on untrusted input, or if you habitually put thousands of leading tab characters in your docstrings, you are strongly encouraged to upgrade immediately to fix [CVE-2024-21503](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21503). This release also fixes a bug in Black's AST safety check that allowed Black to make incorrect changes to certain f-strings that are valid in Python 3.12 and higher. ##### Stable style - Don't move comments along with delimiters, which could cause crashes ([#&#8203;4248](https://github.com/psf/black/issues/4248)) - Strengthen AST safety check to catch more unsafe changes to strings. Previous versions of Black would incorrectly format the contents of certain unusual f-strings containing nested strings with the same quote type. Now, Black will crash on such strings until support for the new f-string syntax is implemented. ([#&#8203;4270](https://github.com/psf/black/issues/4270)) - Fix a bug where line-ranges exceeding the last code line would not work as expected ([#&#8203;4273](https://github.com/psf/black/issues/4273)) ##### Performance - Fix catastrophic performance on docstrings that contain large numbers of leading tab characters. This fixes [CVE-2024-21503](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21503). ([#&#8203;4278](https://github.com/psf/black/issues/4278)) ##### Documentation - Note what happens when `--check` is used with `--quiet` ([#&#8203;4236](https://github.com/psf/black/issues/4236)) ### [`v24.2.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2420) [Compare Source](https://github.com/psf/black/compare/24.1.1...24.2.0) ##### Stable style - Fixed a bug where comments where mistakenly removed along with redundant parentheses ([#&#8203;4218](https://github.com/psf/black/issues/4218)) ##### Preview style - Move the `hug_parens_with_braces_and_square_brackets` feature to the unstable style due to an outstanding crash and proposed formatting tweaks ([#&#8203;4198](https://github.com/psf/black/issues/4198)) - Fixed a bug where base expressions caused inconsistent formatting of \*\* in ternary expression ([#&#8203;4154](https://github.com/psf/black/issues/4154)) - Checking for newline before adding one on docstring that is almost at the line limit ([#&#8203;4185](https://github.com/psf/black/issues/4185)) - Remove redundant parentheses in `case` statement `if` guards ([#&#8203;4214](https://github.com/psf/black/issues/4214)). ##### Configuration - Fix issue where *Black* would ignore input files in the presence of symlinks ([#&#8203;4222](https://github.com/psf/black/issues/4222)) - *Black* now ignores `pyproject.toml` that is missing a `tool.black` section when discovering project root and configuration. Since *Black* continues to use version control as an indicator of project root, this is expected to primarily change behavior for users in a monorepo setup (desirably). If you wish to preserve previous behavior, simply add an empty `[tool.black]` to the previously discovered `pyproject.toml` ([#&#8203;4204](https://github.com/psf/black/issues/4204)) ##### Output - Black will swallow any `SyntaxWarning`s or `DeprecationWarning`s produced by the `ast` module when performing equivalence checks ([#&#8203;4189](https://github.com/psf/black/issues/4189)) ##### Integrations - Add a JSONSchema and provide a validate-pyproject entry-point ([#&#8203;4181](https://github.com/psf/black/issues/4181)) ### [`v24.1.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2411) [Compare Source](https://github.com/psf/black/compare/24.1.0...24.1.1) Bugfix release to fix a bug that made Black unusable on certain file systems with strict limits on path length. ##### Preview style - Consistently add trailing comma on typed parameters ([#&#8203;4164](https://github.com/psf/black/issues/4164)) ##### Configuration - Shorten the length of the name of the cache file to fix crashes on file systems that do not support long paths ([#&#8203;4176](https://github.com/psf/black/issues/4176)) ### [`v24.1.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2410) [Compare Source](https://github.com/psf/black/compare/23.12.1...24.1.0) ##### Highlights This release introduces the new 2024 stable style ([#&#8203;4106](https://github.com/psf/black/issues/4106)), stabilizing the following changes: - Add parentheses around `if`-`else` expressions ([#&#8203;2278](https://github.com/psf/black/issues/2278)) - Dummy class and function implementations consisting only of `...` are formatted more compactly ([#&#8203;3796](https://github.com/psf/black/issues/3796)) - If an assignment statement is too long, we now prefer splitting on the right-hand side ([#&#8203;3368](https://github.com/psf/black/issues/3368)) - Hex codes in Unicode escape sequences are now standardized to lowercase ([#&#8203;2916](https://github.com/psf/black/issues/2916)) - Allow empty first lines at the beginning of most blocks ([#&#8203;3967](https://github.com/psf/black/issues/3967), [#&#8203;4061](https://github.com/psf/black/issues/4061)) - Add parentheses around long type annotations ([#&#8203;3899](https://github.com/psf/black/issues/3899)) - Enforce newline after module docstrings ([#&#8203;3932](https://github.com/psf/black/issues/3932), [#&#8203;4028](https://github.com/psf/black/issues/4028)) - Fix incorrect magic trailing comma handling in return types ([#&#8203;3916](https://github.com/psf/black/issues/3916)) - Remove blank lines before class docstrings ([#&#8203;3692](https://github.com/psf/black/issues/3692)) - Wrap multiple context managers in parentheses if combined in a single `with` statement ([#&#8203;3489](https://github.com/psf/black/issues/3489)) - Fix bug in line length calculations for power operations ([#&#8203;3942](https://github.com/psf/black/issues/3942)) - Add trailing commas to collection literals even if there's a comment after the last entry ([#&#8203;3393](https://github.com/psf/black/issues/3393)) - When using `--skip-magic-trailing-comma` or `-C`, trailing commas are stripped from subscript expressions with more than 1 element ([#&#8203;3209](https://github.com/psf/black/issues/3209)) - Add extra blank lines in stubs in a few cases ([#&#8203;3564](https://github.com/psf/black/issues/3564), [#&#8203;3862](https://github.com/psf/black/issues/3862)) - Accept raw strings as docstrings ([#&#8203;3947](https://github.com/psf/black/issues/3947)) - Split long lines in case blocks ([#&#8203;4024](https://github.com/psf/black/issues/4024)) - Stop removing spaces from walrus operators within subscripts ([#&#8203;3823](https://github.com/psf/black/issues/3823)) - Fix incorrect formatting of certain async statements ([#&#8203;3609](https://github.com/psf/black/issues/3609)) - Allow combining `# fmt: skip` with other comments ([#&#8203;3959](https://github.com/psf/black/issues/3959)) There are already a few improvements in the `--preview` style, which are slated for the 2025 stable style. Try them out and [share your feedback](https://github.com/psf/black/issues). In the past, the preview style has included some features that we were not able to stabilize. This year, we're adding a separate `--unstable` style for features with known problems. Now, the `--preview` style only includes features that we actually expect to make it into next year's stable style. ##### Stable style Several bug fixes were made in features that are moved to the stable style in this release: - Fix comment handling when parenthesising conditional expressions ([#&#8203;4134](https://github.com/psf/black/issues/4134)) - Fix bug where spaces were not added around parenthesized walruses in subscripts, unlike other binary operators ([#&#8203;4109](https://github.com/psf/black/issues/4109)) - Remove empty lines before docstrings in async functions ([#&#8203;4132](https://github.com/psf/black/issues/4132)) - Address a missing case in the change to allow empty lines at the beginning of all blocks, except immediately before a docstring ([#&#8203;4130](https://github.com/psf/black/issues/4130)) - For stubs, fix logic to enforce empty line after nested classes with bodies ([#&#8203;4141](https://github.com/psf/black/issues/4141)) ##### Preview style - Add `--unstable` style, covering preview features that have known problems that would block them from going into the stable style. Also add the `--enable-unstable-feature` flag; for example, use `--enable-unstable-feature hug_parens_with_braces_and_square_brackets` to apply this preview feature throughout 2024, even if a later Black release downgrades the feature to unstable ([#&#8203;4096](https://github.com/psf/black/issues/4096)) - Format module docstrings the same as class and function docstrings ([#&#8203;4095](https://github.com/psf/black/issues/4095)) - Fix crash when using a walrus in a dictionary ([#&#8203;4155](https://github.com/psf/black/issues/4155)) - Fix unnecessary parentheses when wrapping long dicts ([#&#8203;4135](https://github.com/psf/black/issues/4135)) - Stop normalizing spaces before `# fmt: skip` comments ([#&#8203;4146](https://github.com/psf/black/issues/4146)) ##### Configuration - Print warning when configuration in `pyproject.toml` contains an invalid key ([#&#8203;4165](https://github.com/psf/black/issues/4165)) - Fix symlink handling, properly ignoring symlinks that point outside of root ([#&#8203;4161](https://github.com/psf/black/issues/4161)) - Fix cache mtime logic that resulted in false positive cache hits ([#&#8203;4128](https://github.com/psf/black/issues/4128)) - Remove the long-deprecated `--experimental-string-processing` flag. This feature can currently be enabled with `--preview --enable-unstable-feature string_processing`. ([#&#8203;4096](https://github.com/psf/black/issues/4096)) ##### Integrations - Revert the change to run Black's pre-commit integration only on specific git hooks ([#&#8203;3940](https://github.com/psf/black/issues/3940)) for better compatibility with older versions of pre-commit ([#&#8203;4137](https://github.com/psf/black/issues/4137)) ### [`v23.12.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-23121) [Compare Source](https://github.com/psf/black/compare/23.12.0...23.12.1) ##### Packaging - Fixed a bug that included dependencies from the `d` extra by default ([#&#8203;4108](https://github.com/psf/black/issues/4108)) ### [`v23.12.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-23120) [Compare Source](https://github.com/psf/black/compare/23.11.0...23.12.0) ##### Highlights It's almost 2024, which means it's time for a new edition of *Black*'s stable style! Together with this release, we'll put out an alpha release 24.1a1 showcasing the draft 2024 stable style, which we'll finalize in the January release. Please try it out and [share your feedback](https://github.com/psf/black/issues/4042). This release (23.12.0) will still produce the 2023 style. Most but not all of the changes in `--preview` mode will be in the 2024 stable style. ##### Stable style - Fix bug where `# fmt: off` automatically dedents when used with the `--line-ranges` option, even when it is not within the specified line range. ([#&#8203;4084](https://github.com/psf/black/issues/4084)) - Fix feature detection for parenthesized context managers ([#&#8203;4104](https://github.com/psf/black/issues/4104)) ##### Preview style - Prefer more equal signs before a break when splitting chained assignments ([#&#8203;4010](https://github.com/psf/black/issues/4010)) - Standalone form feed characters at the module level are no longer removed ([#&#8203;4021](https://github.com/psf/black/issues/4021)) - Additional cases of immediately nested tuples, lists, and dictionaries are now indented less ([#&#8203;4012](https://github.com/psf/black/issues/4012)) - Allow empty lines at the beginning of all blocks, except immediately before a docstring ([#&#8203;4060](https://github.com/psf/black/issues/4060)) - Fix crash in preview mode when using a short `--line-length` ([#&#8203;4086](https://github.com/psf/black/issues/4086)) - Keep suites consisting of only an ellipsis on their own lines if they are not functions or class definitions ([#&#8203;4066](https://github.com/psf/black/issues/4066)) ([#&#8203;4103](https://github.com/psf/black/issues/4103)) ##### Configuration - `--line-ranges` now skips *Black*'s internal stability check in `--safe` mode. This avoids a crash on rare inputs that have many unformatted same-content lines. ([#&#8203;4034](https://github.com/psf/black/issues/4034)) ##### Packaging - Upgrade to mypy 1.7.1 ([#&#8203;4049](https://github.com/psf/black/issues/4049)) ([#&#8203;4069](https://github.com/psf/black/issues/4069)) - Faster compiled wheels are now available for CPython 3.12 ([#&#8203;4070](https://github.com/psf/black/issues/4070)) ##### Integrations - Enable 3.12 CI ([#&#8203;4035](https://github.com/psf/black/issues/4035)) - Build docker images in parallel ([#&#8203;4054](https://github.com/psf/black/issues/4054)) - Build docker images with 3.12 ([#&#8203;4055](https://github.com/psf/black/issues/4055)) ### [`v23.11.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-23110) [Compare Source](https://github.com/psf/black/compare/23.10.1...23.11.0) ##### Highlights - Support formatting ranges of lines with the new `--line-ranges` command-line option ([#&#8203;4020](https://github.com/psf/black/issues/4020)) ##### Stable style - Fix crash on formatting bytes strings that look like docstrings ([#&#8203;4003](https://github.com/psf/black/issues/4003)) - Fix crash when whitespace followed a backslash before newline in a docstring ([#&#8203;4008](https://github.com/psf/black/issues/4008)) - Fix standalone comments inside complex blocks crashing Black ([#&#8203;4016](https://github.com/psf/black/issues/4016)) - Fix crash on formatting code like `await (a ** b)` ([#&#8203;3994](https://github.com/psf/black/issues/3994)) - No longer treat leading f-strings as docstrings. This matches Python's behaviour and fixes a crash ([#&#8203;4019](https://github.com/psf/black/issues/4019)) ##### Preview style - Multiline dicts and lists that are the sole argument to a function are now indented less ([#&#8203;3964](https://github.com/psf/black/issues/3964)) - Multiline unpacked dicts and lists as the sole argument to a function are now also indented less ([#&#8203;3992](https://github.com/psf/black/issues/3992)) - In f-string debug expressions, quote types that are visible in the final string are now preserved ([#&#8203;4005](https://github.com/psf/black/issues/4005)) - Fix a bug where long `case` blocks were not split into multiple lines. Also enable general trailing comma rules on `case` blocks ([#&#8203;4024](https://github.com/psf/black/issues/4024)) - Keep requiring two empty lines between module-level docstring and first function or class definition ([#&#8203;4028](https://github.com/psf/black/issues/4028)) - Add support for single-line format skip with other comments on the same line ([#&#8203;3959](https://github.com/psf/black/issues/3959)) ##### Configuration - Consistently apply force exclusion logic before resolving symlinks ([#&#8203;4015](https://github.com/psf/black/issues/4015)) - Fix a bug in the matching of absolute path names in `--include` ([#&#8203;3976](https://github.com/psf/black/issues/3976)) ##### Performance - Fix mypyc builds on arm64 on macOS ([#&#8203;4017](https://github.com/psf/black/issues/4017)) ##### Integrations - Black's pre-commit integration will now run only on git hooks appropriate for a code formatter ([#&#8203;3940](https://github.com/psf/black/issues/3940)) ### [`v23.10.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-23101) [Compare Source](https://github.com/psf/black/compare/23.10.0...23.10.1) ##### Highlights - Maintenance release to get a fix out for GitHub Action edge case ([#&#8203;3957](https://github.com/psf/black/issues/3957)) ##### Preview style - Fix merging implicit multiline strings that have inline comments ([#&#8203;3956](https://github.com/psf/black/issues/3956)) - Allow empty first line after block open before a comment or compound statement ([#&#8203;3967](https://github.com/psf/black/issues/3967)) ##### Packaging - Change Dockerfile to hatch + compile black ([#&#8203;3965](https://github.com/psf/black/issues/3965)) ##### Integrations - The summary output for GitHub workflows is now suppressible using the `summary` parameter. ([#&#8203;3958](https://github.com/psf/black/issues/3958)) - Fix the action failing when Black check doesn't pass ([#&#8203;3957](https://github.com/psf/black/issues/3957)) ##### Documentation - It is known Windows documentation CI is broken [#&#8203;3968](https://github.com/psf/black/issues/3968) ### [`v23.10.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-23100) [Compare Source](https://github.com/psf/black/compare/23.9.1...23.10.0) ##### Stable style - Fix comments getting removed from inside parenthesized strings ([#&#8203;3909](https://github.com/psf/black/issues/3909)) ##### Preview style - Fix long lines with power operators getting split before the line length ([#&#8203;3942](https://github.com/psf/black/issues/3942)) - Long type hints are now wrapped in parentheses and properly indented when split across multiple lines ([#&#8203;3899](https://github.com/psf/black/issues/3899)) - Magic trailing commas are now respected in return types. ([#&#8203;3916](https://github.com/psf/black/issues/3916)) - Require one empty line after module-level docstrings. ([#&#8203;3932](https://github.com/psf/black/issues/3932)) - Treat raw triple-quoted strings as docstrings ([#&#8203;3947](https://github.com/psf/black/issues/3947)) ##### Configuration - Fix cache versioning logic when `BLACK_CACHE_DIR` is set ([#&#8203;3937](https://github.com/psf/black/issues/3937)) ##### Parser - Fix bug where attributes named `type` were not accepted inside `match` statements ([#&#8203;3950](https://github.com/psf/black/issues/3950)) - Add support for PEP 695 type aliases containing lambdas and other unusual expressions ([#&#8203;3949](https://github.com/psf/black/issues/3949)) ##### Output - Black no longer attempts to provide special errors for attempting to format Python 2 code ([#&#8203;3933](https://github.com/psf/black/issues/3933)) - Black will more consistently print stacktraces on internal errors in verbose mode ([#&#8203;3938](https://github.com/psf/black/issues/3938)) ##### Integrations - The action output displayed in the job summary is now wrapped in Markdown ([#&#8203;3914](https://github.com/psf/black/issues/3914)) ### [`v23.9.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2391) [Compare Source](https://github.com/psf/black/compare/23.9.0...23.9.1) Due to various issues, the previous release (23.9.0) did not include compiled mypyc wheels, which make Black significantly faster. These issues have now been fixed, and this release should come with compiled wheels once again. There will be no wheels for Python 3.12 due to a bug in mypyc. We will provide 3.12 wheels in a future release as soon as the mypyc bug is fixed. ##### Packaging - Upgrade to mypy 1.5.1 ([#&#8203;3864](https://github.com/psf/black/issues/3864)) ##### Performance - Store raw tuples instead of NamedTuples in Black's cache, improving performance and decreasing the size of the cache ([#&#8203;3877](https://github.com/psf/black/issues/3877)) ### [`v23.9.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2390) [Compare Source](https://github.com/psf/black/compare/23.7.0...23.9.0) ##### Preview style - More concise formatting for dummy implementations ([#&#8203;3796](https://github.com/psf/black/issues/3796)) - In stub files, add a blank line between a statement with a body (e.g an `if sys.version_info > (3, x):`) and a function definition on the same level ([#&#8203;3862](https://github.com/psf/black/issues/3862)) - Fix a bug whereby spaces were removed from walrus operators within subscript([#&#8203;3823](https://github.com/psf/black/issues/3823)) ##### Configuration - Black now applies exclusion and ignore logic before resolving symlinks ([#&#8203;3846](https://github.com/psf/black/issues/3846)) ##### Performance - Avoid importing `IPython` if notebook cells do not contain magics ([#&#8203;3782](https://github.com/psf/black/issues/3782)) - Improve caching by comparing file hashes as fallback for mtime and size ([#&#8203;3821](https://github.com/psf/black/issues/3821)) ##### *Blackd* - Fix an issue in `blackd` with single character input ([#&#8203;3558](https://github.com/psf/black/issues/3558)) ##### Integrations - Black now has an [official pre-commit mirror](https://github.com/psf/black-pre-commit-mirror). Swapping `https://github.com/psf/black` to `https://github.com/psf/black-pre-commit-mirror` in your `.pre-commit-config.yaml` will make Black about 2x faster ([#&#8203;3828](https://github.com/psf/black/issues/3828)) - The `.black.env` folder specified by `ENV_PATH` will now be removed on the completion of the GitHub Action ([#&#8203;3759](https://github.com/psf/black/issues/3759)) ### [`v23.7.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2370) [Compare Source](https://github.com/psf/black/compare/23.3.0...23.7.0) ##### Highlights - Runtime support for Python 3.7 has been removed. Formatting 3.7 code will still be supported until further notice ([#&#8203;3765](https://github.com/psf/black/issues/3765)) ##### Stable style - Fix a bug where an illegal trailing comma was added to return type annotations using PEP 604 unions ([#&#8203;3735](https://github.com/psf/black/issues/3735)) - Fix several bugs and crashes where comments in stub files were removed or mishandled under some circumstances ([#&#8203;3745](https://github.com/psf/black/issues/3745)) - Fix a crash with multi-line magic comments like `type: ignore` within parentheses ([#&#8203;3740](https://github.com/psf/black/issues/3740)) - Fix error in AST validation when *Black* removes trailing whitespace in a type comment ([#&#8203;3773](https://github.com/psf/black/issues/3773)) ##### Preview style - Implicitly concatenated strings used as function args are no longer wrapped inside parentheses ([#&#8203;3640](https://github.com/psf/black/issues/3640)) - Remove blank lines between a class definition and its docstring ([#&#8203;3692](https://github.com/psf/black/issues/3692)) ##### Configuration - The `--workers` argument to *Black* can now be specified via the `BLACK_NUM_WORKERS` environment variable ([#&#8203;3743](https://github.com/psf/black/issues/3743)) - `.pytest_cache`, `.ruff_cache` and `.vscode` are now excluded by default ([#&#8203;3691](https://github.com/psf/black/issues/3691)) - Fix *Black* not honouring `pyproject.toml` settings when running `--stdin-filename` and the `pyproject.toml` found isn't in the current working directory ([#&#8203;3719](https://github.com/psf/black/issues/3719)) - *Black* will now error if `exclude` and `extend-exclude` have invalid data types in `pyproject.toml`, instead of silently doing the wrong thing ([#&#8203;3764](https://github.com/psf/black/issues/3764)) ##### Packaging - Upgrade mypyc from 0.991 to 1.3 ([#&#8203;3697](https://github.com/psf/black/issues/3697)) - Remove patching of Click that mitigated errors on Python 3.6 with `LANG=C` ([#&#8203;3768](https://github.com/psf/black/issues/3768)) ##### Parser - Add support for the new PEP 695 syntax in Python 3.12 ([#&#8203;3703](https://github.com/psf/black/issues/3703)) ##### Performance - Speed up *Black* significantly when the cache is full ([#&#8203;3751](https://github.com/psf/black/issues/3751)) - Avoid importing `IPython` in a case where we wouldn't need it ([#&#8203;3748](https://github.com/psf/black/issues/3748)) ##### Output - Use aware UTC datetimes internally, avoids deprecation warning on Python 3.12 ([#&#8203;3728](https://github.com/psf/black/issues/3728)) - Change verbose logging to exactly mirror *Black*'s logic for source discovery ([#&#8203;3749](https://github.com/psf/black/issues/3749)) ##### *Blackd* - The `blackd` argument parser now shows the default values for options in their help text ([#&#8203;3712](https://github.com/psf/black/issues/3712)) ##### Integrations - Black is now tested with [`PYTHONWARNDEFAULTENCODING = 1`](https://docs.python.org/3/library/io.html#io-encoding-warning) ([#&#8203;3763](https://github.com/psf/black/issues/3763)) - Update GitHub Action to display black output in the job summary ([#&#8203;3688](https://github.com/psf/black/issues/3688)) ##### Documentation - Add a CITATION.cff file to the root of the repository, containing metadata on how to cite this software ([#&#8203;3723](https://github.com/psf/black/issues/3723)) - Update the *classes* and *exceptions* documentation in Developer reference to match the latest code base ([#&#8203;3755](https://github.com/psf/black/issues/3755)) ### [`v23.3.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2330) [Compare Source](https://github.com/psf/black/compare/23.1.0...23.3.0) ##### Highlights This release fixes a longstanding confusing behavior in Black's GitHub action, where the version of the action did not determine the version of Black being run (issue [#&#8203;3382](https://github.com/psf/black/issues/3382)). In addition, there is a small bug fix around imports and a number of improvements to the preview style. Please try out the [preview style](https://black.readthedocs.io/en/stable/the_black_code_style/future_style.html#preview-style) with `black --preview` and tell us your feedback. All changes in the preview style are expected to become part of Black's stable style in January 2024. ##### Stable style - Import lines with `# fmt: skip` and `# fmt: off` no longer have an extra blank line added when they are right after another import line ([#&#8203;3610](https://github.com/psf/black/issues/3610)) ##### Preview style - Add trailing commas to collection literals even if there's a comment after the last entry ([#&#8203;3393](https://github.com/psf/black/issues/3393)) - `async def`, `async for`, and `async with` statements are now formatted consistently compared to their non-async version. ([#&#8203;3609](https://github.com/psf/black/issues/3609)) - `with` statements that contain two context managers will be consistently wrapped in parentheses ([#&#8203;3589](https://github.com/psf/black/issues/3589)) - Let string splitters respect [East Asian Width](https://www.unicode.org/reports/tr11/) ([#&#8203;3445](https://github.com/psf/black/issues/3445)) - Now long string literals can be split after East Asian commas and periods (`、` U+3001 IDEOGRAPHIC COMMA, `。` U+3002 IDEOGRAPHIC FULL STOP, & `，` U+FF0C FULLWIDTH COMMA) besides before spaces ([#&#8203;3445](https://github.com/psf/black/issues/3445)) - For stubs, enforce one blank line after a nested class with a body other than just `...` ([#&#8203;3564](https://github.com/psf/black/issues/3564)) - Improve handling of multiline strings by changing line split behavior ([#&#8203;1879](https://github.com/psf/black/issues/1879)) ##### Parser - Added support for formatting files with invalid type comments ([#&#8203;3594](https://github.com/psf/black/issues/3594)) ##### Integrations - Update GitHub Action to use the version of Black equivalent to action's version if version input is not specified ([#&#8203;3543](https://github.com/psf/black/issues/3543)) - Fix missing Python binary path in autoload script for vim ([#&#8203;3508](https://github.com/psf/black/issues/3508)) ##### Documentation - Document that only the most recent release is supported for security issues; vulnerabilities should be reported through Tidelift ([#&#8203;3612](https://github.com/psf/black/issues/3612)) ### [`v23.1.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2310) [Compare Source](https://github.com/psf/black/compare/22.12.0...23.1.0) ##### Highlights This is the first release of 2023, and following our [stability policy](https://black.readthedocs.io/en/stable/the_black_code_style/index.html#stability-policy), it comes with a number of improvements to our stable style, including improvements to empty line handling, removal of redundant parentheses in several contexts, and output that highlights implicitly concatenated strings better. There are also many changes to the preview style; try out `black --preview` and give us feedback to help us set the stable style for next year. In addition to style changes, Black now automatically infers the supported Python versions from your `pyproject.toml` file, removing the need to set Black's target versions separately. ##### Stable style - Introduce the 2023 stable style, which incorporates most aspects of last year's preview style ([#&#8203;3418](https://github.com/psf/black/issues/3418)). Specific changes: - Enforce empty lines before classes and functions with sticky leading comments ([#&#8203;3302](https://github.com/psf/black/issues/3302)) (22.12.0) - Reformat empty and whitespace-only files as either an empty file (if no newline is present) or as a single newline character (if a newline is present) ([#&#8203;3348](https://github.com/psf/black/issues/3348)) (22.12.0) - Implicitly concatenated strings used as function args are now wrapped inside parentheses ([#&#8203;3307](https://github.com/psf/black/issues/3307)) (22.12.0) - Correctly handle trailing commas that are inside a line's leading non-nested parens ([#&#8203;3370](https://github.com/psf/black/issues/3370)) (22.12.0) - `--skip-string-normalization` / `-S` now prevents docstring prefixes from being normalized as expected ([#&#8203;3168](https://github.com/psf/black/issues/3168)) (since 22.8.0) - When using `--skip-magic-trailing-comma` or `-C`, trailing commas are stripped from subscript expressions with more than 1 element ([#&#8203;3209](https://github.com/psf/black/issues/3209)) (22.8.0) - Implicitly concatenated strings inside a list, set, or tuple are now wrapped inside parentheses ([#&#8203;3162](https://github.com/psf/black/issues/3162)) (22.8.0) - Fix a string merging/split issue when a comment is present in the middle of implicitly concatenated strings on its own line ([#&#8203;3227](https://github.com/psf/black/issues/3227)) (22.8.0) - Docstring quotes are no longer moved if it would violate the line length limit ([#&#8203;3044](https://github.com/psf/black/issues/3044), [#&#8203;3430](https://github.com/psf/black/issues/3430)) (22.6.0) - Parentheses around return annotations are now managed ([#&#8203;2990](https://github.com/psf/black/issues/2990)) (22.6.0) - Remove unnecessary parentheses around awaited objects ([#&#8203;2991](https://github.com/psf/black/issues/2991)) (22.6.0) - Remove unnecessary parentheses in `with` statements ([#&#8203;2926](https://github.com/psf/black/issues/2926)) (22.6.0) - Remove trailing newlines after code block open ([#&#8203;3035](https://github.com/psf/black/issues/3035)) (22.6.0) - Code cell separators `#%%` are now standardised to `# %%` ([#&#8203;2919](https://github.com/psf/black/issues/2919)) (22.3.0) - Remove unnecessary parentheses from `except` statements ([#&#8203;2939](https://github.com/psf/black/issues/2939)) (22.3.0) - Remove unnecessary parentheses from tuple unpacking in `for` loops ([#&#8203;2945](https://github.com/psf/black/issues/2945)) (22.3.0) - Avoid magic-trailing-comma in single-element subscripts ([#&#8203;2942](https://github.com/psf/black/issues/2942)) (22.3.0) - Fix a crash when a colon line is marked between `# fmt: off` and `# fmt: on` ([#&#8203;3439](https://github.com/psf/black/issues/3439)) ##### Preview style - Format hex codes in unicode escape sequences in string literals ([#&#8203;2916](https://github.com/psf/black/issues/2916)) - Add parentheses around `if`-`else` expressions ([#&#8203;2278](https://github.com/psf/black/issues/2278)) - Improve performance on large expressions that contain many strings ([#&#8203;3467](https://github.com/psf/black/issues/3467)) - Fix a crash in preview style with assert + parenthesized string ([#&#8203;3415](https://github.com/psf/black/issues/3415)) - Fix crashes in preview style with walrus operators used in function return annotations and except clauses ([#&#8203;3423](https://github.com/psf/black/issues/3423)) - Fix a crash in preview advanced string processing where mixed implicitly concatenated regular and f-strings start with an empty span ([#&#8203;3463](https://github.com/psf/black/issues/3463)) - Fix a crash in preview advanced string processing where a standalone comment is placed before a dict's value ([#&#8203;3469](https://github.com/psf/black/issues/3469)) - Fix an issue where extra empty lines are added when a decorator has `# fmt: skip` applied or there is a standalone comment between decorators ([#&#8203;3470](https://github.com/psf/black/issues/3470)) - Do not put the closing quotes in a docstring on a separate line, even if the line is too long ([#&#8203;3430](https://github.com/psf/black/issues/3430)) - Long values in dict literals are now wrapped in parentheses; correspondingly unnecessary parentheses around short values in dict literals are now removed; long string lambda values are now wrapped in parentheses ([#&#8203;3440](https://github.com/psf/black/issues/3440)) - Fix two crashes in preview style involving edge cases with docstrings ([#&#8203;3451](https://github.com/psf/black/issues/3451)) - Exclude string type annotations from improved string processing; fix crash when the return type annotation is stringified and spans across multiple lines ([#&#8203;3462](https://github.com/psf/black/issues/3462)) - Wrap multiple context managers in parentheses when targeting Python 3.9+ ([#&#8203;3489](https://github.com/psf/black/issues/3489)) - Fix several crashes in preview style with walrus operators used in `with` statements or tuples ([#&#8203;3473](https://github.com/psf/black/issues/3473)) - Fix an invalid quote escaping bug in f-string expressions where it produced invalid code. Implicitly concatenated f-strings with different quotes can now be merged or quote-normalized by changing the quotes used in expressions. ([#&#8203;3509](https://github.com/psf/black/issues/3509)) - Fix crash on `await (yield)` when Black is compiled with mypyc ([#&#8203;3533](https://github.com/psf/black/issues/3533)) ##### Configuration - Black now tries to infer its `--target-version` from the project metadata specified in `pyproject.toml` ([#&#8203;3219](https://github.com/psf/black/issues/3219)) ##### Packaging - Upgrade mypyc from `0.971` to `0.991` so mypycified *Black* can be built on armv7 ([#&#8203;3380](https://github.com/psf/black/issues/3380)) - This also fixes some crashes while using compiled Black with a debug build of CPython - Drop specific support for the `tomli` requirement on 3.11 alpha releases, working around a bug that would cause the requirement not to be installed on any non-final Python releases ([#&#8203;3448](https://github.com/psf/black/issues/3448)) - Black now depends on `packaging` version `22.0` or later. This is required for new functionality that needs to parse part of the project metadata ([#&#8203;3219](https://github.com/psf/black/issues/3219)) ##### Output - Calling `black --help` multiple times will return the same help contents each time ([#&#8203;3516](https://github.com/psf/black/issues/3516)) - Verbose logging now shows the values of `pyproject.toml` configuration variables ([#&#8203;3392](https://github.com/psf/black/issues/3392)) - Fix false symlink detection messages in verbose output due to using an incorrect relative path to the project root ([#&#8203;3385](https://github.com/psf/black/issues/3385)) ##### Integrations - Move 3.11 CI to normal flow now that all dependencies support 3.11 ([#&#8203;3446](https://github.com/psf/black/issues/3446)) - Docker: Add new `latest_prerelease` tag automation to follow latest black alpha release on docker images ([#&#8203;3465](https://github.com/psf/black/issues/3465)) ##### Documentation - Expand `vim-plug` installation instructions to offer more explicit options ([#&#8203;3468](https://github.com/psf/black/issues/3468)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xOTIuMiIsInVwZGF0ZWRJblZlciI6IjQ0LjE5Mi4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

renovate-bot added 1 commit 2026-10-29 13:08:35 -04:00

Update dependency black to v26 3f526df64b

BlazingNeutron manually merged commit 0044b6d025 into main 2026-10-29 14:01:37 -04:00

BlazingNeutron deleted branch renovate/black-26.x 2026-10-29 14:01:49 -04:00

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