# Black changelog

> The uncompromising Python code formatter.

- Vendor: Python Software Foundation
- Category: Developer Tools
- Official site: https://black.readthedocs.io
- Tracked by: What's New (https://whatsnew.fyi/product/black)
- Harvested from: GitHub (psf/black)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## Releases

### 26.5.1

- Date: 2026-05-18
- Version: 26.5.1
- Original notes: https://github.com/psf/black/releases/tag/26.5.1
- Permalink: https://whatsnew.fyi/product/black/releases/26.5.1

- **fixed** — Fix unstable formatting of annotated assignments whose subscript annotation contains an inline comment
- **fixed** — Preserve inline comments (including # type: ignore) immediately before a # fmt: skip line, avoiding AST equivalence failures
- **fixed** — Correct the version in the published executables
- **added** — Add Neovim integration guide covering conform.nvim, ALE, and simple command approaches

###### 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)

### 26.5.0

- Date: 2026-05-16
- Version: 26.5.0
- Original notes: https://github.com/psf/black/releases/tag/26.5.0
- Permalink: https://whatsnew.fyi/product/black/releases/26.5.0

- **added** — Support for unpacking in comprehensions (PEP 798) and lazy imports (PEP 810), new syntactic features in Python 3.15
- **added** — Python 3.15 support
- **fixed** — Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses
- **fixed** — Fix crash when an f-string follows a `# fmt: off` comment inside brackets
- **fixed** — Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line
- **changed** — Improve heuristics around blank lines before, within and after groups of same-name decorated functions (such as `@overload` groups) in `.pyi` stub files
- **fixed** — Fix blank lines being removed between a function and a decorated class in `.pyi` stub files
- **fixed** — Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket
- **changed** — Improve parse error readability by showing multi-line output with an error pointer
- **added** — Add `SourceASTParseError` to distinguish source parse failures from internal safety errors
- **changed** — Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500 in Blackd, keeping HTTP 500 only for genuine internal safety errors

###### 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)

### 26.3.1

- Date: 2026-03-12
- Version: 26.3.1
- Original notes: https://github.com/psf/black/releases/tag/26.3.1
- Permalink: https://whatsnew.fyi/product/black/releases/26.3.1

- **fixed** — 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
- **changed** — Always hash cache filename components derived from --python-cell-magics so custom magic names cannot affect cache paths
- **changed** — Disable browser-originated requests by default in Blackd, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure

###### 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)

### 26.3.0

- Date: 2026-03-06
- Version: 26.3.0
- Original notes: https://github.com/psf/black/releases/tag/26.3.0
- Permalink: https://whatsnew.fyi/product/black/releases/26.3.0

- **fixed** — Don't double-decode input, causing non-UTF-8 files to be corrupted
- **fixed** — Fix crash on standalone comment in lambda default arguments
- **fixed** — Preserve parentheses when # type: ignore comments would be merged with other comments on the same line, preventing AST equivalence failures
- **fixed** — Fix bug where if guards in case blocks were incorrectly split when the pattern had a trailing comma
- **fixed** — Fix string_processing crashing on unassigned long string literals with trailing commas
- **changed** — Simplify implementation of the power operator "hugging" logic
- **fixed** — Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments
- **added** — Introduce winloop for Windows as an alternative to uvloop
- **removed** — Remove deprecated function uvloop.install() in favor of uvloop.new_event_loop()
- **changed** — Rename maybe_install_uvloop function to maybe_use_uvloop to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop
- **changed** — Emit a clear warning when the target Python version is newer than the running Python version, since AST safety checks cannot parse newer syntax, and replace the misleading "INTERNAL ERROR" message with an actionable error explaining the version mismatch
- **added** — Introduce winloop to be used when Windows is in use which enables blackd to run faster on Windows when winloop is installed
- **removed** — Remove unused gallery script
- **security** — 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

###### 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 evenloop 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)

### 26.1.0

- Date: 2026-01-18
- Version: 26.1.0
- Original notes: https://github.com/psf/black/releases/tag/26.1.0
- Permalink: https://whatsnew.fyi/product/black/releases/26.1.0

- **added** — Introduce the 2026 stable style with always_one_newline_after_import to force one blank line after import statements except when followed by a comment or import
- **fixed** — Fix fmt: skip behavior on one-liner declarations to prevent incorrect collapsing
- **fixed** — Fix module docstrings being treated as normal strings if preceded by comments
- **fixed** — Fix type expansions split in generic functions
- **added** — Add multiline_string_handling to make expressions involving multiline strings more compact
- **added** — Add normalize_cr_newlines to normalize file newlines with \r style newlines
- **added** — Add remove_parens_around_except_types to remove parentheses around multiple exception types in except and except* without as
- **added** — Add remove_parens_from_assignment_lhs to remove unnecessary parentheses from the left-hand side of assignments while preserving magic trailing commas
- **added** — Add standardize_type_comments to format type comments to # type: (value) style
- **changed** — Regenerate the _width_table.py with added tests for the Khmer language
- **changed** — Bump pathspec to v1 and fix inconsistencies with Git's .gitignore logic to match Git behavior for ignored patterns
- **fixed** — Explicitly shutdown the multiprocessing manager when run in diff mode

###### 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 alo 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 it's 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)

### 26.1a1

- Date: 2025-12-08
- Version: 26.1a1
- Original notes: https://github.com/psf/black/releases/tag/26.1a1
- Permalink: https://whatsnew.fyi/product/black/releases/26.1a1
- Labels: Pre-release

- **added** — always_one_newline_after_import option to always force one blank line after import statements, except when the line after the import is a comment or an import statement
- **fixed** — fix_fmt_skip_in_one_liners to correct # fmt: skip behavior on one-liner declarations such as def foo(): return "mock" # fmt: skip where the declaration would have been incorrectly collapsed
- **fixed** — fix_module_docstring_detection to prevent module docstrings from being treated as normal strings if preceded by comments
- **fixed** — fix_type_expansion_split to correct type expansions split in generic functions
- **added** — multiline_string_handling option to make expressions involving multiline strings more compact
- **added** — normalize_cr_newlines option to add \r style newlines to the potential newlines to normalize file newlines both from and to
- **added** — remove_parens_around_except_types option to remove parentheses around multiple exception types in except and except* without as
- **added** — remove_parens_from_assignment_lhs option to remove unnecessary parentheses from the left-hand side of assignments while preserving magic trailing commas and intentional multiline formatting
- **added** — standardize_type_comments option to format type comments which have zero or more spaces between # and type: or between type: and value to # type: (value)
- **changed** — Regenerated the _width_table.py and added tests for the Khmer language

This is a preview of the Black stable style for 2026 (#4892). Please test it and
[share your feedback](https://github.com/psf/black/issues/4042)!

The following formatting changes are included:

- `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`. See PEP 758 for details (#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)
- Regenerated the `_width_table.py` and added tests for the Khmer language (#4253)

### 25.12.0

- Date: 2025-12-08
- Version: 25.12.0
- Original notes: https://github.com/psf/black/releases/tag/25.12.0
- Permalink: https://whatsnew.fyi/product/black/releases/25.12.0

- **removed** — Black no longer supports running with Python 3.9
- **fixed** — Fix bug where comments preceding # fmt: off/# fmt: on blocks were incorrectly removed, particularly affecting Jupytext's # %% [markdown] comments
- **fixed** — 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
- **fixed** — Fix possible crash when fmt: directives aren't on the top level
- **fixed** — Fix # fmt: skip skipping the line after instead of the line it's on
- **changed** — Remove unnecessary parentheses from the left-hand side of assignments while preserving magic trailing commas and intentional multiline formatting
- **fixed** — Fix fix_fmt_skip_in_one_liners crashing on with statements
- **fixed** — Fix fix_fmt_skip_in_one_liners crashing on annotated parameters
- **fixed** — Fix new lines being added after imports with # fmt: skip on them
- **added** — Releases now include arm64 Windows binaries and wheels
- **added** — Add output-file input to GitHub Action psf/black to write formatter output to a file for artifact capture and log cleanliness

Please test out the draft 2026 style in version 26.1a1! This style will be finalized in
the January release (26.1.0). Most of the changes in `--preview` will be in the 2026
stable style, but not all.
[Please share your feedback!](https://github.com/psf/black/issues/4042)

This release (25.12.0) will still produce the 2025 style.

###### 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)

### 25.11.0

- Date: 2025-11-10
- Version: 25.11.0
- Original notes: https://github.com/psf/black/releases/tag/25.11.0
- Permalink: https://whatsnew.fyi/product/black/releases/25.11.0

- **added** — Enable base 3.14 support
- **added** — Add support for the new Python 3.14 t-string syntax introduced by PEP 750
- **fixed** — Fix bug where comments between # fmt: off and # fmt: on were reformatted
- **changed** — Comments containing fmt directives now preserve their exact formatting instead of being normalized
- **changed** — Move multiline_string_handling from --unstable to --preview
- **fixed** — Fix bug where module docstrings would be treated as normal strings if preceded by comments
- **fixed** — Fix bug where python 3.12 generics syntax split line happens weirdly
- **changed** — Standardize type comments to form # type: <value>
- **fixed** — Fix fix_fmt_skip_in_one_liners preview feature to respect # fmt: skip for compound statements with semicolon-separated bodies
- **added** — Add no_cache option to control caching behavior
- **added** — Releases now include arm64 Linux binaries
- **changed** — Write unchanged content to stdout when excluding formatting from stdin using pipes
- **added** — Implement BlackDClient, a simple python client to send formatting requests to blackd
- **changed** — Enhance GitHub Action psf/black to support the required-version major-version-only stability format when using pyproject.toml
- **changed** — Improve error message for vim plugin users and warn on unsupported Vim and Python versions independently
- **fixed** — Vim: Fix handling of virtualenvs that have a different Python version
- **changed** — Vim: Print the import paths when importing black fails

###### 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)

### 25.9.0

- Date: 2025-09-19
- Version: 25.9.0
- Original notes: https://github.com/psf/black/releases/tag/25.9.0
- Permalink: https://whatsnew.fyi/product/black/releases/25.9.0

- **removed** — Remove support for pre-python 3.7 await/async as soft keywords/variable names
- **fixed** — Fix crash while formatting a long del statement containing tuples
- **fixed** — Fix crash while formatting expressions using the walrus operator in complex with statements
- **fixed** — Handle # fmt: skip followed by a comment at the end of file
- **fixed** — Fix crash when a tuple appears in the as clause of a with statement
- **fixed** — Fix crash when tuple is used as a context manager inside a with statement
- **fixed** — Fix crash when formatting a \ followed by a \r followed by a comment
- **fixed** — Fix crash on a \\r\n
- **fixed** — Fix crash on await ... where ... is a literal Ellipsis
- **fixed** — Fix crash on parenthesized expression inside a type parameter bound
- **fixed** — Fix crash when using line ranges excluding indented single line decorated items
- **fixed** — Fix a bug where one-liner functions/conditionals marked with # fmt: skip would still be formatted
- **changed** — Improve multiline_string_handling with ternaries and dictionaries
- **fixed** — Fix a bug where string_processing would not split f-strings directly after expressions
- **changed** — Wrap the in clause of comprehensions across lines if necessary
- **changed** — Remove parentheses around multiple exception types in except and except* without as
- **changed** — Add \r style newlines to the potential newlines to normalize file newlines both from and to
- **changed** — Rewrite tokenizer to improve performance and compliance
- **fixed** — Fix bug where certain unusual expressions such as lambdas were not accepted in type parameter bounds and defaults
- **changed** — Avoid using an extra process when running with only one worker

###### 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)

### 25.1.0

- Date: 2025-01-29
- Version: 25.1.0
- Original notes: https://github.com/psf/black/releases/tag/25.1.0
- Permalink: https://whatsnew.fyi/product/black/releases/25.1.0

- **changed** — Normalize casing of Unicode escape characters in strings to lowercase
- **fixed** — Fix inconsistencies in whether certain strings are detected as docstrings
- **changed** — Consistently add trailing commas to typed function parameters
- **changed** — Remove redundant parentheses in if guards for case blocks
- **changed** — Add parentheses to if clauses in case blocks when the line is too long
- **changed** — Whitespace before # fmt: skip comments is no longer normalized
- **fixed** — Fix line length computation for certain expressions that involve the power operator
- **fixed** — Check if there is a newline before the terminating quotes of a docstring
- **fixed** — Fix type annotation spacing between * and more complex type variable tuple
- **changed** — Remove parentheses around sole list items
- **changed** — Generic function definitions are now formatted more elegantly with parameters split over multiple lines first instead of type parameter definitions
- **fixed** — Fix formatting cells in IPython notebooks with magic methods and starting or trailing empty lines
- **fixed** — Fix crash when formatting with statements containing tuple generators or unpacking
- **fixed** — Fix string merging changing f-string quotes on f-strings with internal quotes
- **changed** — Collapse multiple empty lines after an import into one
- **fixed** — Prevent string_processing and wrap_long_dict_values_in_parens from removing parentheses around long dictionary values
- **changed** — Move wrap_long_dict_values_in_parens from the unstable to preview style
- **changed** — Store license identifier inside the License-Expression metadata field
- **changed** — Speed up the is_fstring_start function in Black's tokenizer
- **changed** — If using stdin with --stdin-filename set to a force excluded path, stdin won't be formatted

###### 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](https://peps.python.org/pep-0639/). (#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)