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Fix blackd error handling: split SourceASTParseError from ASTSafetyError#5080

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cobaltt7 merged 3 commits into
psf:mainfrom
Bahtya:fix/blackd-source-ast-parse-error
Apr 27, 2026
Merged

Fix blackd error handling: split SourceASTParseError from ASTSafetyError#5080
cobaltt7 merged 3 commits into
psf:mainfrom
Bahtya:fix/blackd-source-ast-parse-error

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@Bahtya

@Bahtya Bahtya commented Apr 6, 2026 •
edited by cobaltt7
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Summary

Per @JelleZijlstra's review feedback on #5074, this PR splits the error handling instead of treating all ASTSafetyError as 400.

Changes

  1. New exception: SourceASTParseError (src/black/parsing.py)

    • Raised when the source file cannot be parsed by ast.parse() but was accepted by Black's more lenient lib2to3 parser
    • This is a user input issue, not a Black bug

  2. Updated assert_equivalent (src/black/__init__.py)

    • Source AST parse failure → SourceASTParseError (user input issue)
    • Dest AST parse failure → ASTSafetyError (Black bug → 500)
    • Non-equivalent output → ASTSafetyError (Black bug → 500)

  3. Updated blackd (src/blackd/__init__.py)

    • SourceASTParseError → 400 Bad Request
    • ASTSafetyError → 500 Internal Server Error (unchanged, caught by generic Exception handler)

Closes

Fixes #3616

Analysis of all ASTSafetyError uses

Location Cause Error type blackd status
assert_equivalent src AST parse fail User input (lenient parser) SourceASTParseError 400
assert_equivalent dest AST parse fail Black bug ASTSafetyError 500
assert_equivalent src ≠ dst Black bug ASTSafetyError 500
check_stability_and_equivalence re-raise Depends on underlying Propagated 400 or 500

@Bahtya
Split SourceASTParseError from ASTSafetyError for blackd error handling
69e5ac7 
- Add SourceASTParseError exception for source file AST parse failures
  (user input issue, not a Black bug)
- Keep ASTSafetyError for Black output issues (invalid code, non-equivalent)
- In blackd, return 400 for SourceASTParseError, 500 for ASTSafetyError
- Per @JelleZijlstra review feedback on #5074
@Bahtya

Bahtya commented Apr 11, 2026

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Hi team, just wanted to follow up on this PR. Would appreciate any feedback!

@cobaltt7

cobaltt7 commented Apr 12, 2026 •
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The code looks good to me, could you just add changelog entries (one in the Output section about the new error, and one in the Blackd section about the corrected handling) and updated tests?

@cobaltt7 cobaltt7 requested a review from JelleZijlstra April 12, 2026 19:14
@github-actions

github-actions Bot commented Apr 12, 2026 •
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diff-shades results comparing this PR (edd0aae) to main (e079b7e):

--preview style: no changes

--stable style: no changes

What is this? | Workflow run | diff-shades documentation

@JelleZijlstra

JelleZijlstra commented Apr 14, 2026

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Looks good, but please add a changelog entry.

@Bahtya

Bahtya commented Apr 14, 2026

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Thanks @cobaltt7 @JelleZijlstra for the review! I will add the changelog entries (Output section for the new error, Blackd section for the corrected handling) and update the tests. Pushing changes shortly.

@cobaltt7 cobaltt7 merged commit 9fd9ea2 into psf:main Apr 27, 2026
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@cobaltt7

cobaltt7 commented Apr 27, 2026

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Thanks!

luketainton pushed a commit to luketainton/repos_webexmemebot that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#585)
d25d755 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

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<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xODEuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE4MS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJ0eXBlL2RlcGVuZGVuY2llcyJdfQ==-->

Reviewed-on: https://git.tainton.uk/repos/webexmemebot/pulls/585
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luketainton pushed a commit to luketainton/repos_PwnedPW that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#334)
aa8315c 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

### Configuration

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  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

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🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

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luketainton pushed a commit to luketainton/repos_epage that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#220)
d91d7b6 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

### Configuration

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- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

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Reviewed-on: https://git.tainton.uk/repos/epage/pulls/220
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luketainton pushed a commit to luketainton/luke_instant-msg-api that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#258)
f6868eb 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

### Configuration

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- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

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Reviewed-on: https://git.tainton.uk/luke/instant-msg-api/pulls/258
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
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luketainton pushed a commit to luketainton/repos_pypilot that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#446)
d02df29 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

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Reviewed-on: https://git.tainton.uk/repos/pypilot/pulls/446
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>
luketainton pushed a commit to luketainton/repos_roboluke that referenced this pull request May 17, 2026
@luketainton
chore(deps): update dependency black to <26.5.1,>=26.5.0 (#448)
ca86f07 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | `<26.3.2,>=26.3.1` → `<26.5.1,>=26.5.0` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/black/26.5.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/black/26.3.1/26.5.0?slim=true) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xODEuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE4MS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJ0eXBlL2RlcGVuZGVuY2llcyJdfQ==-->

Reviewed-on: https://git.tainton.uk/repos/roboluke/pulls/448
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>
736-c41-2c1-e464fc974 pushed a commit to Swiss-Armed-Forces/Loom that referenced this pull request Jun 6, 2026
@736-c41-2c1-e464fc974
chore(deps): update root dev dependencies (minor)
318e15d 
This MR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [black](https://github.com/psf/black) ([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) | dev | minor | `26.3.1` → `26.5.1` | [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/psf/black/badge)](https://securityscorecards.dev/viewer/?uri=github.com/psf/black) |
| [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) ([changelog](https://pytest-asyncio.readthedocs.io/en/stable/reference/changelog.html)) | test | minor | `1.3.0` → `1.4.0` | [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/pytest-dev/pytest-asyncio/badge)](https://securityscorecards.dev/viewer/?uri=github.com/pytest-dev/pytest-asyncio) |
| [python-gitlab](https://github.com/python-gitlab/python-gitlab) ([changelog](https://github.com/python-gitlab/python-gitlab/blob/main/CHANGELOG.md)) | dev | minor | `8.3.0` → `8.4.0` | [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/python-gitlab/python-gitlab/badge)](https://securityscorecards.dev/viewer/?uri=github.com/python-gitlab/python-gitlab) |

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

### [`v26.5.1`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2651)

[Compare Source](psf/black@26.5.0...26.5.1)

##### Stable style

- Fix unstable formatting of annotated assignments whose subscript annotation contains
  an inline comment (e.g. `x: list[  # pyright: ignore[...]`) ([#&#8203;5130](psf/black#5130))
- Preserve inline comments (including `# type: ignore`) immediately before a
  `# fmt: skip` line, avoiding AST equivalence failures ([#&#8203;5139](psf/black#5139))

##### Packaging

- Correct the version in the published executables ([#&#8203;5137](psf/black#5137))

##### Documentation

- Add Neovim integration guide covering conform.nvim, ALE, and simple command approaches
  ([#&#8203;5124](psf/black#5124))

### [`v26.5.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#Version-2650)

[Compare Source](psf/black@26.3.1...26.5.0)

##### Highlights

- Add support for unpacking in comprehensions (PEP 798) and for lazy imports (PEP 810),
  both new syntactic features in Python 3.15 ([#&#8203;5048](psf/black#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. ([#&#8203;5127](psf/black#5127))

##### Stable style

- Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in`
  clauses ([#&#8203;4903](psf/black#4903))
- Add syntactic support for Python 3.15 ([#&#8203;5048](psf/black#5048))
- Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#&#8203;5097](psf/black#5097))
- Preserve multiline compound statement headers when `# fmt: skip` is placed on the
  colon line ([#&#8203;5117](psf/black#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 ([#&#8203;5021](psf/black#5021))
- Fix blank lines being removed between a function and a decorated class in `.pyi` stub
  files ([#&#8203;5092](psf/black#5092))
- Prevent string merger from creating unsplittable long lines when a pragma comment
  (e.g. `# type: ignore`) follows the closing bracket ([#&#8203;5096](psf/black#5096))

##### Packaging

- Run CI on 3.15 ([#&#8203;5127](psf/black#5127))

##### Output

- Improve parse error readability by showing multi-line output with an error pointer.
  ([#&#8203;5068](psf/black#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 ([#&#8203;5080](psf/black#5080))

##### *Blackd*

- Return HTTP 400 (Bad Request) for source parse failures instead of HTTP 500, keeping
  HTTP 500 only for genuine internal safety errors ([#&#8203;5080](psf/black#5080))

##### Integrations

- Added documentation for doctest formatting tools and updated the integrations index to
  match ([#&#8203;4916](psf/black#4916))

##### Documentation

- Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs
  ([#&#8203;5063](psf/black#5063))
- Note in the editor integrations that the SublimeText `sublack` plugin is archived and
  unmaintained ([#&#8203;5082](psf/black#5082))

</details>

<details>
<summary>pytest-dev/pytest-asyncio (pytest-asyncio)</summary>

### [`v1.4.0`](https://github.com/pytest-dev/pytest-asyncio/releases/tag/v1.4.0): pytest-asyncio v1.4.0

[Compare Source](pytest-dev/pytest-asyncio@v1.3.0...v1.4.0)

### [1.4.0](https://github.com/pytest-dev/pytest-asyncio/tree/1.4.0) - 2026-05-26

#### Deprecated

- Overriding the *event\_loop\_policy* fixture is deprecated. Use the `pytest_asyncio_loop_factories` hook instead. ([#&#8203;1419](pytest-dev/pytest-asyncio#1419))

#### Added

- Added the `pytest_asyncio_loop_factories` hook to parametrize asyncio tests with custom event loop factories.

  The hook returns a mapping of factory names to loop factories, and `pytest.mark.asyncio(loop_factories=[...])` selects a subset of configured factories per test. When a single factory is configured, test names are unchanged.

  Synchronous `@pytest_asyncio.fixture` functions now see the correct event loop when custom loop factories are configured, even when test code disrupts the current event loop (e.g., via `asyncio.run()` or `asyncio.set_event_loop(None)`). ([#&#8203;1164](pytest-dev/pytest-asyncio#1164))

#### Changed

- Improved the readability of the warning message that is displayed when `asyncio_default_fixture_loop_scope` is unset ([#&#8203;1298](pytest-dev/pytest-asyncio#1298))
- Only import `asyncio.AbstractEventLoopPolicy` for type checking to avoid raising
  a DeprecationWarning. ([#&#8203;1394](pytest-dev/pytest-asyncio#1394))
- Updated minimum supported pytest version to v8.4.0. ([#&#8203;1397](pytest-dev/pytest-asyncio#1397))

#### Fixed

- Fixed a `ResourceWarning: unclosed event loop` warning that could occur when a synchronous test called `asyncio.run()` or otherwise unset the current event loop after pytest-asyncio had run an async test or fixture. ([#&#8203;724](pytest-dev/pytest-asyncio#724))

#### Notes for Downstream Packagers

- Added dependency on `sphinx-tabs >= 3.5` to organize documentation examples into tabs. ([#&#8203;1395](pytest-dev/pytest-asyncio#1395))

</details>

<details>
<summary>python-gitlab/python-gitlab (python-gitlab)</summary>

### [`v8.4.0`](https://github.com/python-gitlab/python-gitlab/blob/HEAD/CHANGELOG.md#v840-2026-05-28)

[Compare Source](python-gitlab/python-gitlab@v8.3.0...v8.4.0)

##### Features

- **const**: Add new Security Manager role
  ([`3738bb2`](python-gitlab/python-gitlab@3738bb2))

##### Testing

- **const**: Add tests for AccessLevel
  ([`2ab6d9f`](python-gitlab/python-gitlab@2ab6d9f))

</details>

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box

---

This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
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See merge request swiss-armed-forces/cyber-command/cea/loom!526

Co-authored-by: Loom MR Pipeline Trigger <group_103951964_bot_9504bb8dead6d4e406ad817a607f24be@noreply.gitlab.com>
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(🐞) blackd bad f-string fragment causes 500 response

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@Bahtya @cobaltt7 @JelleZijlstra