GeezerVison

Sourced from ruff's releases.

0.17.4

Release Notes

Released on 2026-11-05.

Preview features

• [flake8-logging-format] Avoid behavior changes and syntax errors in fixes (G004) (#27419)
• [security] Implement tarfile-ignore-zeros-true (#28680)

Bug fixes

• Accept a bare raise before a semicolon (#29761)
• Allow match identifiers after a semicolon (#29760)
• Fix panic on BOM-prefixed files in diagnostic renderer (#30017)
• [flake8-simplify] Report collapsible elif clauses after a multi-statement if branch (SIM102) (#29814)

Rule changes

• Show more nonprinting characters in diagnostic fix diffs (#30062)

Performance

• Coalesce source slices when formatting attributes (#29841)
• Collect return statements with a statement-only visitor (#29911)
• [pyflakes] Defer value comparisons for repeated dictionary keys (F601, F602) (#29739)
• Format node fields directly when comment handling is unnecessary (#29853)
• Reduce formatter source-slice overhead (#29855)
• Reuse a callee's qualified name across lint rules (#29916)
• Skip invalid string character checks when the source contains none (#29883)
• Use a Bloom filter for formatter comment lookups (#29852)
• Use a concrete buffer for ordinary writes (#29819)

CLI

• Give NO_COLOR precedence in Ruff and ty diagnostics (#29898)
• Honor CLICOLOR=0 in Ruff and ty diagnostics (#29910)

Documentation

• Correct the documented version and src defaults for ruff-action (#29880)
• [flake8-bugbear] Make B014 example error out-of-the-box (#29941)
• [flake8-no-pep420] Document preview behavior (INP001) (#29764)
• [isort] Expand I001 documentation (#29843)

Other changes

• [syntax-errors] Extend __debug__ write check to attribute targets (#27908)

Contributors

... (truncated)

Sourced from ruff's changelog.

0.17.4

Released on 2026-11-05.

Preview features

• [flake8-logging-format] Avoid behavior changes and syntax errors in fixes (G004) (#27419)
• [security] Implement tarfile-ignore-zeros-true (#28680)

Bug fixes

• Accept a bare raise before a semicolon (#29761)
• Allow match identifiers after a semicolon (#29760)
• Fix panic on BOM-prefixed files in diagnostic renderer (#30017)
• [flake8-simplify] Report collapsible elif clauses after a multi-statement if branch (SIM102) (#29814)

Rule changes

• Show more nonprinting characters in diagnostic fix diffs (#30062)

Performance

• Coalesce source slices when formatting attributes (#29841)
• Collect return statements with a statement-only visitor (#29911)
• [pyflakes] Defer value comparisons for repeated dictionary keys (F601, F602) (#29739)
• Format node fields directly when comment handling is unnecessary (#29853)
• Reduce formatter source-slice overhead (#29855)
• Reuse a callee's qualified name across lint rules (#29916)
• Skip invalid string character checks when the source contains none (#29883)
• Use a Bloom filter for formatter comment lookups (#29852)
• Use a concrete buffer for ordinary writes (#29819)

CLI

• Give NO_COLOR precedence in Ruff and ty diagnostics (#29898)
• Honor CLICOLOR=0 in Ruff and ty diagnostics (#29910)

Documentation

• Correct the documented version and src defaults for ruff-action (#29880)
• [flake8-bugbear] Make B014 example error out-of-the-box (#29941)
• [flake8-no-pep420] Document preview behavior (INP001) (#29764)
• [isort] Expand I001 documentation (#29843)

Other changes

• [syntax-errors] Extend __debug__ write check to attribute targets (#27908)

Contributors

... (truncated)

• 05cdc36 Bump version to 0.17.4 (#30073)
• c6b17c2 [ty] Freshen method typevars before owner specialization (#29543)
• 4b0b407 [ty] Preserve unions inferred during fixpoint iteration (#29927)
• 1dd3e9e Show more nonprinting characters in diagnostic fix diffs (#30062)
• 32be8e7 [ty] Skip fixpoint iteration for simple generic calls (#30054)
• 926ccc8 [ty] Handle output errors when generating shell completions (#29997)
• c86652a [ty] Skip active Conda and Pixi environments during discovery if the environm...
• c9150f0 Add project walltime benchmarks for Ruff (#30061)
• 64989ec [ty] Report invalid module globs once per override pattern (#30031)
• 367a563 [ty] Fix conditional type and tuple annotations (#29987)
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