Bump black from 25.12.0 to 26.1.0

[dependabot]

Bumps black from 25.12.0 to 26.1.0.

Release notes

Sourced from black's releases.

26.1.0

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

... (truncated)

Changelog

Sourced from black's changelog.

26.1.0

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

... (truncated)

Commits

• 6305bf1 Prepare 2026.1.0 release (#4892)
• e71305b Bump pypa/cibuildwheel from 3.3.0 to 3.3.1 (#4961)
• 21a2a8c Fix Shutdown multiprocessing Manager in schedule_formatting (#4952)
• e3146ce Bump docker/setup-buildx-action from 3.11.1 to 3.12.0 (#4919)
• fe1fbc4 Bump actions/upload-artifact from 5.0.0 to 6.0.0 (#4923)
• 2b4b7fc Bump actions/download-artifact from 6.0.0 to 7.0.0 (#4922)
• d745be6 docs: document --force-exclude for pre-commit workflows (#4957)
• b41acd6 Various CI and doc refactors (#4928)
• 6f43612 Handle pathspec v1 changes (#4958)
• 200c550 Bump furo from 2025.9.25 to 2025.12.19 in /docs (#4933)
• Additional commits viewable in compare view

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---

Resolves #4892
Resolves #4489
Resolves #4800
Resolves #4764
Resolves #4777
Resolves #1879
Resolves #4710
Resolves #4720
Resolves #4865
Resolves #4645
Resolves #4253
Resolves #4958
Resolves #4961
Resolves #4952
Resolves #4919
Resolves #4923
Resolves #4922
Resolves #4957
Resolves #4928
Resolves #4933

[github-actions]

🤖 Claude Code Review

---

Code Review: Bump black from 25.12.0 to 26.1.0

Code Quality

✅ Code follows our style guide - This is a dependency version update in pyproject.toml, not application code. The file formatting is correct and consistent.

✅ No commented-out code - N/A for this change type.

✅ Meaningful variable names - N/A for this change type.

✅ DRY principle followed - N/A for this change type.

✅ Identify Defects - No defects found. This is a straightforward dependency version bump from black==25.12.0 to black==26.1.0 on line 73 of pyproject.toml. The change only applies to Python versions > 3.11 as intended. This is an automated Dependabot update for a code formatter, which poses minimal risk.

✅ Project memory claude configuration - The .claude/CLAUDE.md file contains appropriate general project guidance and does not contain environment-specific configurations.

Testing

⚠️ Unit tests for new functions - N/A for dependency updates, but should verify linting still passes after the major version bump.

⚠️ Integration tests for new endpoints - N/A

⚠️ Edge cases covered - N/A

⚠️ Test coverage > 80% - N/A for this change, but recommend running the lint command to verify: pylint $(git ls-files '*.py' ':!:docs/source/*') and running black to ensure no unexpected formatting changes occur with the major version bump (25.x → 26.x).

Documentation

❌ Readme updated if needed - N/A for this type of change.

❌ API docs updated - N/A

❌ Inline comments for complex logic - N/A

❌ CHANGELOG.md updated - The CHANGELOG.md has not been updated to reflect this dependency upgrade. While dependency bumps are often not included in user-facing changelogs, for a major version bump (25 → 26) of a linting tool, it may be worth noting in case formatting behavior changes.

✅ Markdown files follow CommonMark - Not applicable to this PR (no markdown changes).

Security

✅ No hardcoded credentials - N/A

✅ Input validation implemented - N/A

✅ Proper error handling - N/A

✅ No sensitive data in logs - N/A

✅ Flag any checked in license files (.lic) - No .lic files or AQAAAD strings detected in this diff.

---

Summary

Overall Assessment: ✅ APPROVED with recommendations

This is a clean, automated dependency update from Dependabot. The change is minimal and well-scoped:

File: pyproject.toml:73
Change: black==25.12.0 → black==26.1.0 (for Python > 3.11)

Recommendations:

1. Verify linting passes - Since this is a major version bump of the Black formatter, run the lint command before merging to ensure no unexpected formatting changes:

   pylint $(git ls-files '*.py' ':!:docs/source/*')

2. Consider CHANGELOG update - While not strictly required for dev dependency updates, documenting major version bumps of tools can help track potential formatting differences.

3. CI should catch issues - Assuming CI runs linting, any breaking changes from Black 26.1.0 will be caught automatically.

No blocking issues found. The change is safe to merge once CI passes.

Automated code review analyzing defects and coding standards