OPT: Update dependency black to v25 ⬆️ - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
black (changelog)	24.10.0 → 25.12.0

---

Release Notes

psf/black (black)

v25.12.0

Compare Source

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

Compare Source

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

Compare Source

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

Compare Source

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)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.70%. Comparing base (aa48168) to head (78a4db3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #163   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files          33       33           
  Lines         891      891           
  Branches       49       49           
=======================================
  Hits          826      826           
  Misses         47       47           
  Partials       18       18           

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