Sourced from ruff's releases.

0.12.0

Release Notes

Check out the blog post for a migration guide and overview of the changes!

Breaking changes

• Detection of more syntax errors

  Ruff now detects version-related syntax errors, such as the use of the match statement on Python versions before 3.10, and syntax errors emitted by CPython's compiler, such as irrefutable match patterns before the final case arm.

• New default Python version handling for syntax errors

  Ruff will default to the latest supported Python version (3.13) when checking for the version-related syntax errors mentioned above to prevent false positives in projects without a Python version configured. The default in all other cases, like applying lint rules, is unchanged and remains at the minimum supported Python version (3.9).

• Updated f-string formatting

  Ruff now formats multi-line f-strings with format specifiers to avoid adding a line break after the format specifier. This addresses a change to the Python grammar in version 3.13.4 that made such a line break a syntax error.

• rust-toolchain.toml is no longer included in source distributions

  The rust-toolchain.toml is used to specify a higher Rust version than Ruff's minimum supported Rust version (MSRV) for development and building release artifacts. However, when present in source distributions, it would also cause downstream package maintainers to pull in the same Rust toolchain, even if their available toolchain was MSRV-compatible.

Removed Rules

The following rules have been removed:

• suspicious-xmle-tree-usage (S320)

Deprecated Rules

The following rules have been deprecated:

• pandas-df-variable-name

Stabilization

... (truncated)

Sourced from ruff's changelog.

0.12.0

Check out the blog post for a migration guide and overview of the changes!

Breaking changes

• Detection of more syntax errors

  Ruff now detects version-related syntax errors, such as the use of the match statement on Python versions before 3.10, and syntax errors emitted by CPython's compiler, such as irrefutable match patterns before the final case arm.

• New default Python version handling for syntax errors

  Ruff will default to the latest supported Python version (3.13) when checking for the version-related syntax errors mentioned above to prevent false positives in projects without a Python version configured. The default in all other cases, like applying lint rules, is unchanged and remains at the minimum supported Python version (3.9).

• Updated f-string formatting

  Ruff now formats multi-line f-strings with format specifiers to avoid adding a line break after the format specifier. This addresses a change to the Python grammar in version 3.13.4 that made such a line break a syntax error.

• rust-toolchain.toml is no longer included in source distributions

  The rust-toolchain.toml is used to specify a higher Rust version than Ruff's minimum supported Rust version (MSRV) for development and building release artifacts. However, when present in source distributions, it would also cause downstream package maintainers to pull in the same Rust toolchain, even if their available toolchain was MSRV-compatible.

Removed Rules

The following rules have been removed:

• suspicious-xmle-tree-usage (S320)

Deprecated Rules

The following rules have been deprecated:

• pandas-df-variable-name

Stabilization

... (truncated)

• 87f0feb Bump 0.12.0 (#18724)
• 685eac1 Revert "[ty] Offer "Did you mean...?" suggestions for unresolved from impor...
• a93992f [flake8-return] Stabilize only add return None at the end when fixing `im...
• 50f8480 [pyupgrade] Stabilize non-pep695-generic-function (UP047) (#18524)
• 6754e94 [pyupgrade] Stabilize non-pep695-generic-class (UP046) (#18519)
• 33c8c75 [pandas-vet] Deprecate pandas-df-variable-name (PD901) (#18618)
• 34dc8e0 [flake8-bandit] Remove suspicious-xmle-tree-usage (S320) (#18617)
• b01195b Stabilize dataclass-enum (RUF049) (#18570)
• ce176b1 Stabilize unnecessary-dict-index-lookup (PLR1733) (#18571)
• 7072cf6 Remove rust-toolchain.toml from sdist (#17925)
• Additional commits viewable in compare view

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