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fix(deps): update pre-commit hook psf/black to v26

uis-devops-renovatebotrequested to merge
renovate/psf-black-26.x into main

This MR contains the following updates:

Package Type Update Change
psf/black repository major 25.1.0 → 26.1.0

Note: The pre-commit manager in Renovate is not supported by the pre-commit maintainers or community. Please do not report any problems there, instead create a Discussion in the Renovate repository if you have any questions.

Release Notes

psf/black (psf/black)

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 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)

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

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