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[pyupgrade] Don't offer fix for Optional[None] in non-pep604-annotation-optional (UP045) or non-pep604-annotation-union (UP007) #18545

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robsdedude
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@robsdedude robsdedude commented Jun 8, 2025

Summary

As suggested here #18508 (comment), this PR makes UP045/UP007 not offer a fix for Optional[None]. Because

  1. rewriting it to None | None is not helpful or desired
  2. the user's intention is not clear

Related Issue

#18508

@robsdedude robsdedude marked this pull request as draft June 8, 2025 08:05
@robsdedude robsdedude changed the title [pyupgrade] Ignore Optional[None] in non-pep604-annotation-optional (UP045) and non-pep604-annotation-union (UP007) [pyupgrade] Don't offer fix for Optional[None] in non-pep604-annotation-optional (UP045) or non-pep604-annotation-union (UP007) Jun 8, 2025
@robsdedude robsdedude force-pushed the fix/18508-up045-ignore-optional-none branch from 954e2a0 to 3756987 Compare June 8, 2025 08:10
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github-actions bot commented Jun 8, 2025

ruff-ecosystem results

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✅ ecosystem check detected no linter changes.

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✅ ecosystem check detected no linter changes.

@robsdedude robsdedude marked this pull request as ready for review June 8, 2025 08:33
@MichaReiser MichaReiser added the fixes Related to suggested fixes for violations label Jun 11, 2025
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Thank you

@MichaReiser MichaReiser merged commit 0724bee into astral-sh:main Jun 11, 2025
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@robsdedude robsdedude deleted the fix/18508-up045-ignore-optional-none branch June 11, 2025 06:30
dcreager added a commit that referenced this pull request Jun 12, 2025
* main:
  [ty] Add some "inside string" tests for `object.<CURSOR>` completions
  [ty] Pull types on synthesized Python files created by mdtest (#18539)
  Update Rust crate anstyle to v1.0.11 (#18583)
  [`pyupgrade`] Fix `super(__class__, self)` detection in UP008 (super-call-with-parameters) (#18478)
  [ty] Generate the top and bottom materialization of a type (#18594)
  `SourceOrderVisitor` should visit the `Identifier` part of the `PatternKeyword` node (#18635)
  Update salsa (#18636)
  [ty] Update mypy_primer doc (#18638)
  [ty] Improve support for `object.<CURSOR>` completions
  [ty] Add `CoveringNode::find_last`
  [ty] Refactor covering node representation
  [ty] Infer the Python version from `--python=<system installation>` on Unix (#18550)
  [`flake8-return`] Fix `RET504` autofix generating a syntax error (#18428)
  Fix incorrect salsa `return_ref` attribute (#18605)
  Move corpus tests to `ty_python_semantic` (#18609)
  [`pyupgrade`] Don't offer fix for `Optional[None]` in non-pep604-annotation-optional (`UP045)` or non-pep604-annotation-union (`UP007`) (#18545)
  [`pep8-naming`] Suppress fix for `N804` and `N805` if the recommend name is already used (#18472)
  [`ruff`] skip fix for `RUF059` if dummy name is already bound (unused-unpacked-variable) (#18509)
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