treeherder Bump black from 25.9.0 to 25.12.0

Bumps black from 25.9.0 to 25.12.0.

Release notes

25.12.0

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!

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

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)

... (truncated)

Changelog

Sourced from black's changelog.

25.12.0

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

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)

... (truncated)

Commits

782e560 Pin actions/[email protected] (#4895)
f0f4094 Fix new lines being added after imports with # fmt: skip on them (#4894)
70fc194 Revert "Fix # fmt: skip ignored in deeply nested expressions" (#4893)
7044b14 Prepare 25.12.0 release (#4891)
5b470f0 Fix # fmt: skip ignored in deeply nested expressions (#4883)
1b342ef Fix crash when multiple # fmt: skip comments are used in multi-part if-clau...
7b265f1 Pin Hatch to hopefully fix Docker builds (#4878)
c9523f4 Attempt to fix Docker build failures (#4876)
0f376e0 Fix crashes when fmt directives are indented (#4856)
a8bfcc1 Fix fmt: skip skipping the line after instead of the line it's on (#4855)
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Dec 08 '25 02:12 dependabot[bot]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 79.95%. Comparing base (5d64caf) to head (ca64b6a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9116   +/-   ##
=======================================
  Coverage   79.95%   79.95%           
=======================================
  Files         600      600           
  Lines       32560    32560           
  Branches     3310     3310           
=======================================
  Hits        26032    26032           
  Misses       6362     6362           
  Partials      166      166

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Dec 08 '25 02:12 codecov-commenter

@jmaher @Archaeopteryx

We use ruff for formatting and linting. Do we still need to keep black and keep updating it ?

Dec 08 '25 11:12 moijes12