Fix crash when f-string follows # fmt: off inside brackets by ParamChordiya · Pull Request #5097 · psf/black

ParamChordiya · 2026-04-12T20:43:33Z

Summary

Black crashes with an AssertionError when formatting code that contains an f-string after a # fmt: off comment inside brackets:

(
# fmt: off
f"""
"""
# fmt: on
)

Error:

error: cannot format: {' ', 'r', 'f', 'o', ':', 'm', 't', '#', '\n'} is NOT a subset of {'U', 'r', 'f', 'u', 'F', 'R', 'b', 'B'}.

Root Cause

normalize_fmt_off runs before line generation and converts content between # fmt: off/# fmt: on into STANDALONE_COMMENT nodes. When this content is inside an f-string node, the f-string's children (FSTRING_START, FSTRING_MIDDLE, FSTRING_END) get replaced with a single STANDALONE_COMMENT leaf.

When visit_fstring is later called for this modified node, it calls fstring_tstring_to_string() which does str(node)[len(node.prefix):]. This produces a value like # fmt: off\nf"""\n""" — the comment text becomes part of the "string value", which fails the string prefix assertion.

Fix

Added a guard in visit_fstring (and visit_tstring) to detect when the node contains a STANDALONE_COMMENT child (indicating it was modified by normalize_fmt_off). In that case, fall back to visit_default instead of attempting the f-string-to-string conversion.

Test plan

Added regression tests in tests/data/cases/fmtonoff6.py for both triple-quoted and single-line f-strings with # fmt: off inside brackets
All 209 existing formatting tests pass
Verified the fix produces idempotent output

When an f-string appeared after a `# fmt: off` comment inside brackets, Black would crash with an AssertionError about invalid string prefix characters. The root cause: `normalize_fmt_off` (which runs before line generation) converts content between `# fmt: off` and `# fmt: on` into STANDALONE_COMMENT nodes. When this content is inside an f-string node, the f-string's children get replaced with a STANDALONE_COMMENT leaf. However, `visit_fstring` still tried to call `fstring_tstring_to_string` on the modified node, producing a "string" value like `# fmt: off\nf"""\n"""` which fails the string prefix assertion. The fix adds a guard in `visit_fstring` (and `visit_tstring`) to detect when the node has been modified by `normalize_fmt_off` and fall back to `visit_default` instead of attempting the f-string-to-string conversion. Fixes psf#4511.

github-actions · 2026-04-13T00:18:01Z

diff-shades results comparing this PR (67adc97) to main (06e496a):

--preview style: no changes

--stable style: no changes

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

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cobaltt7 · 2026-04-13T01:25:27Z

+
+# Same as above but unindented inside brackets.
+(
+    # fmt: off


Ideally the comments wouldn't move. Would that be a lot of extra work? If so it's fine like this.

Please also add a changelog entry

The comment movement (re-indenting # fmt: off/# fmt: on to match bracket depth) is existing Black behavior for any comment inside brackets — it's not introduced by this PR. Changing that would require modifying the general comment normalization/line generation logic, which feels out of scope for this crash fix. Happy to look into it as a follow-up if you think it's worth pursuing.

Added a changelog entry under Stable style in 67adc97.

Sounds good. Thank you!

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.tainton.uk/repos/webexmemebot/pulls/585 Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk> Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.tainton.uk/repos/PwnedPW/pulls/334 Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk> Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.tainton.uk/repos/epage/pulls/220 Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk> Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.tainton.uk/luke/instant-msg-api/pulls/258 Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk> Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  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>

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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  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>

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[...]`) ([#5130](psf/black#5130)) - Preserve inline comments (including `# type: ignore`) immediately before a `# fmt: skip` line, avoiding AST equivalence failures ([#5139](psf/black#5139)) ##### Packaging - Correct the version in the published executables ([#5137](psf/black#5137)) ##### Documentation - Add Neovim integration guide covering conform.nvim, ALE, and simple command approaches ([#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 ([#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. ([#5127](psf/black#5127)) ##### Stable style - Fix `# fmt: skip` being ignored in nested `if` expressions with parenthesized `in` clauses ([#4903](psf/black#4903)) - Add syntactic support for Python 3.15 ([#5048](psf/black#5048)) - Fix crash when an f-string follows a `# fmt: off` comment inside brackets ([#5097](psf/black#5097)) - Preserve multiline compound statement headers when `# fmt: skip` is placed on the colon line ([#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 ([#5021](psf/black#5021)) - Fix blank lines being removed between a function and a decorated class in `.pyi` stub files ([#5092](psf/black#5092)) - Prevent string merger from creating unsplittable long lines when a pragma comment (e.g. `# type: ignore`) follows the closing bracket ([#5096](psf/black#5096)) ##### Packaging - Run CI on 3.15 ([#5127](psf/black#5127)) ##### Output - Improve parse error readability by showing multi-line output with an error pointer. ([#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 ([#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 ([#5080](psf/black#5080)) ##### Integrations - Added documentation for doctest formatting tools and updated the integrations index to match ([#4916](psf/black#4916)) ##### Documentation - Use "Version X.Y.Z" headings in changelog for stable permalink anchors on ReadTheDocs ([#5063](psf/black#5063)) - Note in the editor integrations that the SublimeText `sublack` plugin is archived and unmaintained ([#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. ([#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)`). ([#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 ([#1298](pytest-dev/pytest-asyncio#1298)) - Only import `asyncio.AbstractEventLoopPolicy` for type checking to avoid raising a DeprecationWarning. ([#1394](pytest-dev/pytest-asyncio#1394)) - Updated minimum supported pytest version to v8.4.0. ([#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. ([#724](pytest-dev/pytest-asyncio#724)) #### Notes for Downstream Packagers - Added dependency on `sphinx-tabs >= 3.5` to organize documentation examples into tabs. ([#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> --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  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>

cobaltt7 reviewed Apr 12, 2026

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Comment thread tests/data/cases/fmtonoff6.py

Add unindented test cases for f-string with # fmt: off inside brackets

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cobaltt7 reviewed Apr 13, 2026

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Add changelog entry for f-string fmt: off crash fix

67adc97

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

JelleZijlstra approved these changes Apr 13, 2026

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cobaltt7 merged commit fc33c25 into psf:main Apr 13, 2026
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Fix crash when f-string follows # fmt: off inside brackets#5097

Fix crash when f-string follows # fmt: off inside brackets#5097
cobaltt7 merged 3 commits into
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ParamChordiya:fix/fstring-fmtoff-crash

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ParamChordiya commented Apr 12, 2026

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