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Changelog 0.12.x

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

The following rules have been stabilized and are no longer in preview:

for-loop-writes (FURB122)
check-and-remove-from-set (FURB132)
verbose-decimal-constructor (FURB157)
fromisoformat-replace-z (FURB162)
int-on-sliced-str (FURB166)
exc-info-outside-except-handler (LOG014)
import-outside-top-level (PLC0415)
unnecessary-dict-index-lookup (PLR1733)
nan-comparison (PLW0177)
eq-without-hash (PLW1641)
pytest-parameter-with-default-argument (PT028)
pytest-warns-too-broad (PT030)
pytest-warns-with-multiple-statements (PT031)
invalid-formatter-suppression-comment (RUF028)
dataclass-enum (RUF049)
class-with-mixed-type-vars (RUF053)
unnecessary-round (RUF057)
starmap-zip (RUF058)
non-pep604-annotation-optional (UP045)
non-pep695-generic-class (UP046)
non-pep695-generic-function (UP047)
private-type-parameter (UP049)

The following behaviors have been stabilized:

collection-literal-concatenation (RUF005) now recognizes slices, in addition to list literals and variables.
The fix for readlines-in-for (FURB129) is now marked as always safe.
if-else-block-instead-of-if-exp (SIM108) will now further simplify expressions to use or instead of an if expression, where possible.
unused-noqa (RUF100) now checks for file-level noqa comments as well as inline comments.
subprocess-without-shell-equals-true (S603) now accepts literal strings, as well as lists and tuples of literal strings, as trusted input.
boolean-type-hint-positional-argument (FBT001) now applies to types that include bool, like bool | int or typing.Optional[bool], in addition to plain bool annotations.
non-pep604-annotation-union (UP007) has now been split into two rules. UP007 now applies only to typing.Union, while non-pep604-annotation-optional (UP045) checks for use of typing.Optional. UP045 has also been stabilized in this release, but you may need to update existing include, ignore, or noqa settings to accommodate this change.

Preview features

```
`ruff`
```
[syntax-errors] Raise unsupported syntax error for template strings prior to Python 3.14 (#18664)

Bug fixes

Add syntax error when conversion flag does not immediately follow exclamation mark (#18706)
Add trailing space around readlines (#18542)
Fix \r and \r\n handling in t- and f-string debug texts (#18673)
Hug closing } when f-string expression has a format specifier (#18704)
```
`flake8-pyi`
```
```
`flake8-return`
```
```
`pep8-naming`
```
```
`pycodestyle`
```
```
`pyupgrade`
```
```
`refurb`
```
```
`ruff`
```
```
`ruff`
```
```
`ruff`
```
```
`ruff`
```
```
`pylint`
```

Rule changes

Fix false positive on mutations in return statements (B909) (#18408)
Treat ty: comments as pragma comments (#18532)
```
`flake8-pyi`
```
```
`pyupgrade`
```
```
`pyupgrade`
```
```
`refurb`
```

Server

Support cancellation requests (#18627)

Documentation

Drop confusing second * from glob pattern example for per-file-target-version (#18709)
Update Neovim configuration examples (#18491)
```
`pylint`
```
```
`refurb`
```

0.12.1

Preview features

```
`flake8-errmsg`
```
```
`flake8-use-pathlib`
```
```
`pygrep-hooks`
```
```
`pylint`
```
```
`ruff`
```
[formatter] Fix missing blank lines before decorated classes in .pyi files (#18888)

Bug fixes

Avoid generating diagnostics with per-file ignores (#18801)
Handle parenthesized arguments in remove_argument (#18805)
```
`flake8-logging`
```
```
`flake8-pytest-style`
```
```
`flake8-pytest-style`
```
```
`flake8-pytest-style`
```
```
`flake8-raise`
```
```
`flake8-simplify`
```
```
`flake8-simplify`
```
```
`flake8-simplify`
```
```
`flake8-pyi`
```
```
`perflint`
```
```
`perflint`
```
```
`pylint`
```
```
`pylint`
```
```
`pylint`
```
```
`pylint`
```
```
`refurb`
```
```
`refurb`
```
```
`refurb`
```
```
`ruff`
```
Fix casing of analyze.direction variant names (#18892)

Rule changes

Fix f-string interpolation escaping in generated fixes (#18882)
```
`flake8-return`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-bugbear`
```
```
`flake8-comprehension`
```
```
`flake8-comprehensions`
```
```
`flake8-future-annotations`
```
```
`pyflakes`
```
```
`pylint`
```
```
`pylint`
```
```
`pylint`
```
```
`pyupgrade`
```
```
`ruff`
```
```
`ruff`
```
```
`ruff`
```

Server

Consider virtual path for various server actions (#18910)

Documentation

Add fix safety sections (#18940,#18841,#18802,#18837,#18800,#18415,#18853,#18842)
Use updated pre-commit id (#18718)
```
`perflint`
```
```
`pyupgrade`
```
```
`flake8-pie`
```
```
`flake8-pyi`
```
```
`flake8-pie`
```
```
`pycodestyle`
```

Other changes

Disallow newlines in format specifiers of single quoted f- or t-strings (#18708)
```
`flake8-logging`
```
```
`pyupgrade`
```

0.12.2

Preview features

```
`flake8-pyi`
```
```
`pyupgrade`
```

Bug fixes

```
`flake8-comprehensions`
```
```
`perflint`
```
```
`pydocstyle`
```
```
`pylint`
```
```
`refurb`
```
```
`ruff`
```
```
`ruff`
```

Rule changes

```
`flake8-executable`
```
```
`pandas`
```
```
`pyupgrade`
```

Documentation

Document link between import-outside-top-level (PLC0415) and lint.flake8-tidy-imports.banned-module-level-imports (#18733)
Fix description of the format.skip-magic-trailing-comma example (#19095)
```
`airflow`
```
```
`airflow`
```
```
`flake8-annotations`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-async`
```
```
`flake8-bandit`
```
```
`flake8-bandit`
```
```
`flake8-bugbear`
```
```
`flake8-bugbear`
```
```
`flake8-datetimez`
```
```
`flake8-datetimez`
```
```
`flake8-pyi`
```
```
`flake8-pyi`
```
```
`flake8-pyi`
```
```
`flake8-pyi`
```
```
`flake8-pyi`
```
```
`flake8-pytest-style`
```
```
`flake8-pytest-style`
```
```
`flake8-quotes`
```
```
`flake8-simplify`
```
```
`flake8-simplify`
```
```
`flake8-simplify`
```
```
`pyflakes`
```
```
`pylint`
```

0.12.3

Preview features

```
`flake8-bugbear`
```
```
`flake8-use-pathlib`
```
```
`flake8-use-pathlib`
```

Bug fixes

```
`flake8-return`
```
Treat form feed as valid whitespace before a line continuation (#19220)
```
`flake8-type-checking`
```
```
`pyupgrade`
```

Documentation

```
`flake8-pyi`
```
```
`flake8-simplify`
```
```
`flake8-type-checking`
```
```
`flake8-use-pathlib`
```
```
`pycodestyle`
```
```
`pycodestyle`
```
```
`pydoclint`
```
```
`pylint`, `pyupgrade`
```
```
`pylint`
```
```
`flake8-bandit`
```

0.12.4

Preview features

`flake8-type-checking`, `pyupgrade`, `ruff`

```
`flake8-use-pathlib`
```
```
`pylint`
```

Bug fixes

```
`flake8-bugbear`
```
```
`flake8-use-pathlib`
```
```
`flake8-django`
```
```
`isort`
```
```
`isort`
```
```
`pydoclint`
```
```
`refurb`
```

Rule changes

```
`flake8-use-pathlib`
```
```
`pep8_naming`
```
```
`pycodestyle`
```
```
`pylint`
```
```
`ruff`
```

Documentation

```
`flake8-type-checking`
```
Make more documentation examples error out-of-the-box (#19288,#19272,#19291,#19296,#19292,#19295,#19297,#19309)

0.12.5

Preview features

```
`flake8-use-pathlib`
```
```
`ruff`
```

Bug fixes

Fix unreachable panic in parser (#19183)
```
`flake8-pyi`
```
```
`perflint`
```
```
`pylint`
```

Rule changes

```
`pep8-naming`
```

0.12.6

Preview features

```
`flake8-commas`
```
```
`pylint`
```
```
`ruff`
```

Bug fixes

Support .pyi files in ruff analyze graph (#19611)
```
`flake8-pyi`
```
```
`perflint`
```
```
`pyupgrade`
```
```
`refurb`
```
```
`refurb`
```
```
`ruff`
```

Rule changes

```
`flake8-blind-except`
```

Performance

Add support for specifying minimum dots in detected string imports (#19538)

0.12.7

This is a follow-up release to 0.12.6. Because of an issue in the package metadata, 0.12.6 failed to publish fully to PyPI and has been yanked. Similarly, there is no GitHub release or Git tag for 0.12.6. The contents of the 0.12.7 release are identical to 0.12.6, except for the updated metadata.

0.12.8

Preview features

```
`flake8-use-pathlib`
```

Bug fixes

```
`flake8-blind-except`
```
```
`flake8-errmsg`
```
```
`flake8-simplify`
```
```
`flake8-import-conventions`
```
```
`isort`
```
```
`pylint`
```
```
`pyupgrade`
```
```
`ruff`
```

Rule changes

```
`eradicate`
```

Documentation

Replace "associative" with "commutative" in docs for RUF036 (#19706)
Fix copy and line separator colors in dark mode (#19630)
Fix link to typing documentation (#19648)
```
`refurb`
```

Other changes

Include column numbers in GitLab output format (#19708)
Always expand tabs to four spaces in diagnostics (#19618)
Update pre-commit's ruff id (#19654)

0.12.9

Preview features

```
`airflow`
```
```
`ruff`
```

Bug fixes

```
`flake8-blind-except`
```
```
`flake8-comprehensions`
```
```
`flake8-simplify`
```

Rule changes

```
`pylint`
```

Documentation

Fix lint.future-annotations link (#19876)

Other changes

Build riscv64 binaries for release (#19819)
Add rule code to error description in GitLab output (#19896)

Improve rendering of the full output format (#19415)

Below is an example diff for F401:

-unused.py:8:19: F401 [*] `pathlib` imported but unused
+F401 [*] `pathlib` imported but unused
+  --> unused.py:8:19
    |
  7 | # Unused, _not_ marked as required (due to the alias).
  8 | import pathlib as non_alias
-   |                   ^^^^^^^^^ F401
+   |                   ^^^^^^^^^
  9 |
 10 | # Unused, marked as required.
    |
-   = help: Remove unused import: `pathlib`
+help: Remove unused import: `pathlib`

For now, the primary difference is the movement of the filename, line number, and column information to a second line in the header. This new representation will allow us to make further additions to Ruff's diagnostics, such as adding sub-diagnostics and multiple annotations to the same snippet.

0.12.10

Preview features

```
`flake8-simplify`
```
```
`flake8-use-pathlib`
```

Bug fixes

```
`isort`
```
```
`pyupgrade`
```
```
`pyupgrade`
```

Rule changes

```
`pycodestyle`
```
```
`pyflakes`
```

Documentation

Fix description of global config file discovery strategy (#19188)
Update outdated links to https://typing.python.org/en/latest/source/stubs.html (#19992)
```
`flake8-annotations`
```

0.12.11

Preview features

```
`airflow`
```
```
`airflow`
```
```
`flake8-async`
```
```
`flake8-logging-format`
```
```
`flake8-use-pathlib`
```
```
`flake8-use-pathlib`
```

Bug fixes

```
`pyflakes`, `pylint`
```
```
`pyflakes`
```
```
`ruff`
```
```
`ruff`
```

Rule changes

```
`ruff`
```

Documentation

Fix incorrect D413 links in docstrings convention FAQ (#20089)
```
`flake8-use-pathlib`
```

0.12.12

Preview features

Show fixes by default (#19919)
```
`airflow`
```
```
`airflow`
```
```
`airflow`
```
```
`flake8-async`
```
```
`flake8-use-pathlib`
```
```
`pylint`
```
```
`ruff`
```

Bug fixes

Less confidently mark f-strings as empty when inferring truthiness (#20152)
```
`fastapi`
```
```
`flake8-comprehensions`
```
```
`perflint`
```

Rule changes

```
`pycodestyle`
```

Documentation

Add fix safety sections to docs (#17490,#17499)

40 KiB Raw Permalink Blame History

Changelog 0.12.x

0.12.0

Breaking changes

Removed Rules

Deprecated Rules

Stabilization

Preview features

Bug fixes

Rule changes

Server

Documentation

0.12.1

Preview features

Bug fixes

Rule changes

Server

Documentation

Other changes

0.12.2

Preview features

Bug fixes

Rule changes

Documentation

0.12.3

Preview features

Bug fixes

Documentation

0.12.4

Preview features

Bug fixes

Rule changes

Documentation

0.12.5

Preview features

Bug fixes

Rule changes

0.12.6

Preview features

Bug fixes

Rule changes

Performance

0.12.7

0.12.8

Preview features

Bug fixes

Rule changes

Documentation

Other changes

0.12.9

Preview features

Bug fixes

Rule changes

Documentation

Other changes

0.12.10

Preview features

Bug fixes

Rule changes

Documentation

0.12.11

Preview features

Bug fixes

Rule changes

Documentation

0.12.12

Preview features

Bug fixes

Rule changes

Documentation

40 KiB

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