## Summary
I think the check included here does make sense, but I don't see why we
would allow it if a value is provided for the attribute -- since, in
that case, isn't it _not_ abstract?
Closes: https://github.com/astral-sh/ruff/issues/11208.
## Summary
This PR adds an override to the fixer to ensure that we apply any
`redefined-while-unused` fixes prior to `unused-import`.
Closes https://github.com/astral-sh/ruff/issues/10905.
## Summary
Implement duplicate code detection as part of `RUF100`, mirroring the
behavior of `flake8-noqa` (`NQA005`) mentioned in #850. The idea to
merge the rule into `RUF100` was suggested by @MichaReiser
https://github.com/astral-sh/ruff/pull/10325#issuecomment-2025535444.
## Test Plan
Test cases were added to the fixture.
This syntax wasn't "deprecated" in Python 3; it was removed.
I started looking at this rule because I was curious how Ruff could even
detect this without a Python 2 parser. Then I realized that
"print >> f, x" is actually valid Python 3 syntax: it creates a tuple
containing a right-shifted version of the print function.
## Summary
Based on discussion in #10850.
As it stands today `RUF100` will attempt to replace code redirects with
their target codes even though this is not the "goal" of `RUF100`. This
behavior is confusing and inconsistent, since code redirects which don't
otherwise violate `RUF100` will not be updated. The behavior is also
undocumented. Additionally, users who want to use `RUF100` but do not
want to update redirects have no way to opt out.
This PR explicitly detects redirects with a new rule `RUF101` and
patches `RUF100` to keep original codes in fixes and reporting.
## Test Plan
Added fixture.
## Summary
Resolves#11102
The error stems from these lines
f5c7a62aa6/crates/ruff_linter/src/noqa.rs (L697-L702)
I don't really understand the purpose of incrementing the last index,
but it makes the resulting range invalid for indexing into `contents`.
For now I just detect if the index is too high in `blanket_noqa` and
adjust it if necessary.
## Test Plan
Created fixture from issue example.
## Summary
This allows `raise from` in BLE001.
```python
try:
...
except Exception as e:
raise ValueError from e
```
Fixes#10806
## Test Plan
Test case added.
## Summary
This PR refactors unary expression parsing with the following changes:
* Ability to get `OperatorPrecedence` from a unary operator (`UnaryOp`)
* Implement methods on `TokenKind`
* Add `as_unary_operator` which returns an `Option<UnaryOp>`
* Add `as_unary_arithmetic_operator` which returns an `Option<UnaryOp>`
(used for pattern parsing)
* Rename `is_unary` to `is_unary_arithmetic_operator` (used in the
linter)
resolves: #10752
## Test Plan
Verify that the existing test cases pass, no ecosystem changes, run the
Python based fuzzer on 3000 random inputs and run it on dozens of
open-source repositories.
## Summary
Fixes#10463
Add `FURB192` which detects violations like this:
```python
# Bad
a = sorted(l)[0]
# Good
a = min(l)
```
There is a caveat that @Skylion007 has pointed out, which is that
violations with `reverse=True` technically aren't compatible with this
change, in the edge case where the unstable behavior is intended. For
example:
```python
from operator import itemgetter
data = [('red', 1), ('blue', 1), ('red', 2), ('blue', 2)]
min(data, key=itemgetter(0)) # ('blue', 1)
sorted(data, key=itemgetter(0))[0] # ('blue', 1)
sorted(data, key=itemgetter(0), reverse=True)[-1] # ('blue, 2')
```
This seems like a rare edge case, but I can make the `reverse=True`
fixes unsafe if that's best.
## Test Plan
This is unit tested.
## References
https://github.com/dosisod/refurb/pull/333/files
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
## Summary
The `operator.itemgetter` behavior changes where there's more than one
argument, such that `operator.itemgetter(0)` yields `r[0]`, rather than
`(r[0],)`.
Closes https://github.com/astral-sh/ruff/issues/11075.
## Summary
There is no class `integer` in python, nor is there a type `integer`, so
I updated the docs to remove the backticks on these references, such
that it is the representation of an integer, and not a reference.
## Summary
Move `blanket-noqa` rule from the token checker to the noqa checker.
This allows us to make use of the line directives already computed in
the noqa checker.
## Test Plan
Verified test results are unchanged.
Resolves#10187
<details>
<summary>Old PR description; accurate through commit e86dd7d; probably
best to leave this fold closed</summary>
## Description of change
In the case of a printf-style format string with only one %-placeholder
and a variable at right (e.g. `"%s" % var`):
* The new behavior attempts to dereference the variable and then match
on the bound expression to distinguish between a 1-tuple (fix), n-tuple
(bug 🐛), or a non-tuple (fix). Dereferencing is via
`analyze::typing::find_binding_value`.
* If the variable cannot be dereferenced, then the type-analysis routine
is called to distinguish only tuple (no-fix) or non-tuple (fix). Type
analysis is via `analyze::typing::is_tuple`.
* If any of the above fails, the rule still fires, but no fix is
offered.
## Alternatives
* If the reviewers think that singling out the 1-tuple case is too
complicated, I will remove that.
* The ecosystem results show that no new fixes are detected. So I could
probably delete all the variable dereferencing code and code that tries
to generate fixes, tbh.
## Changes to existing behavior
**All the previous rule-firings and fixes are unchanged except for** the
"false negatives" in
`crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_1.py`. Those
previous "false negatives" are now true positives and so I moved them to
`crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py`.
<details>
<summary>Existing false negatives that are now true positives</summary>
```
crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py:134:1: UP031 Use format specifiers instead of percent format
|
133 | # UP031 (no longer false negatives)
134 | 'Hello %s' % bar
| ^^^^^^^^^^^^^^^^ UP031
135 |
136 | 'Hello %s' % bar.baz
|
= help: Replace with format specifiers
crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py:136:1: UP031 Use format specifiers instead of percent format
|
134 | 'Hello %s' % bar
135 |
136 | 'Hello %s' % bar.baz
| ^^^^^^^^^^^^^^^^^^^^ UP031
137 |
138 | 'Hello %s' % bar['bop']
|
= help: Replace with format specifiers
crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py:138:1: UP031 Use format specifiers instead of percent format
|
136 | 'Hello %s' % bar.baz
137 |
138 | 'Hello %s' % bar['bop']
| ^^^^^^^^^^^^^^^^^^^^^^^ UP031
|
= help: Replace with format specifiers
```
One of them newly offers a fix.
```
# UP031 (no longer false negatives)
-'Hello %s' % bar
+'Hello {}'.format(bar)
```
This fix occurs because the new code dereferences `bar` to where it was
defined earlier in the file as a non-tuple:
```python
bar = {"bar": y}
```
---
</details>
## Behavior requiring new tests
Additionally, we now handle a few cases that we didn't previously test.
These cases are when a string has a single %-placeholder and the
righthand operand to the modulo operator is a variable **which can be
dereferenced.** One of those was shown in the previous section (the
"dereference non-tuple" case).
<details>
<summary>New cases handled</summary>
```
crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py:126:1: UP031 [*] Use format specifiers instead of percent format
|
125 | t1 = (x,)
126 | "%s" % t1
| ^^^^^^^^^ UP031
127 | # UP031: deref t1 to 1-tuple, offer fix
|
= help: Replace with format specifiers
crates/ruff_linter/resources/test/fixtures/pyupgrade/UP031_0.py:130:1: UP031 Use format specifiers instead of percent format
|
129 | t2 = (x,y)
130 | "%s" % t2
| ^^^^^^^^^ UP031
131 | # UP031: deref t2 to n-tuple, this is a bug
|
= help: Replace with format specifiers
```
One of these offers a fix.
```
t1 = (x,)
-"%s" % t1
+"{}".format(t1[0])
# UP031: deref t1 to 1-tuple, offer fix
```
The other doesn't offer a fix because it's a bug.
---
</details>
---
</details>
## Changes to existing behavior
In the case of a string with a single %-placeholder and a single
ambiguous righthand argument to the modulo operator, (e.g. `"%s" % var`)
the rule now fires and offers a fix. We explain about this in the "fix
safety" section of the updated documentation.
## Documentation changes
I swapped the order of the "known problems" and the "examples" sections
so that the examples which describe the rule are first, before the
exceptions to the rule are described. I also tweaked the language to be
more explicit, as I had trouble understanding the documentation at
first. The "known problems" section is now "fix safety" but the content
is largely similar.
The diff of the documentation changes looks a little difficult unless
you look at the individual commits.
## Summary
I happened to notice that we box `TypeParams` on `StmtClassDef` but not
on `StmtFunctionDef` and wondered why, since `StmtFunctionDef` is bigger
and sets the size of `Stmt`.
@charliermarsh found that at the time we started boxing type params on
classes, classes were the largest statement type (see #6275), but that's
no longer true.
So boxing type-params also on functions reduces the overall size of
`Stmt`.
## Test Plan
The `<=` size tests are a bit irritating (since their failure doesn't
tell you the actual size), but I manually confirmed that the size is
actually 120 now.
Occasionally you intentionally have iterables of differing lengths. The
rule permits this by explicitly adding `strict=False`, but this was not
documented.
## Summary
The rule does not currently document how to avoid it when having
differing length iterables is intentional. This PR adds that to the rule
documentation.
Add pylint rule invalid-hash-returned (PLE0309)
See https://github.com/astral-sh/ruff/issues/970 for rules
Test Plan: `cargo test`
TBD: from the description: "Strictly speaking `bool` is a subclass of
`int`, thus returning `True`/`False` is valid. To be consistent with
other rules (e.g.
[PLE0305](https://github.com/astral-sh/ruff/pull/10962)
invalid-index-returned), ruff will raise, compared to pylint which will
not raise."
(Supersedes #9152, authored by @LaBatata101)
## Summary
This PR replaces the current parser generated from LALRPOP to a
hand-written recursive descent parser.
It also updates the grammar for [PEP
646](https://peps.python.org/pep-0646/) so that the parser outputs the
correct AST. For example, in `data[*x]`, the index expression is now a
tuple with a single starred expression instead of just a starred
expression.
Beyond the performance improvements, the parser is also error resilient
and can provide better error messages. The behavior as seen by any
downstream tools isn't changed. That is, the linter and formatter can
still assume that the parser will _stop_ at the first syntax error. This
will be updated in the following months.
For more details about the change here, refer to the PR corresponding to
the individual commits and the release blog post.
## Test Plan
Write _lots_ and _lots_ of tests for both valid and invalid syntax and
verify the output.
## Acknowledgements
- @MichaReiser for reviewing 100+ parser PRs and continuously providing
guidance throughout the project
- @LaBatata101 for initiating the transition to a hand-written parser in
#9152
- @addisoncrump for implementing the fuzzer which helped
[catch](https://github.com/astral-sh/ruff/pull/10903)
[a](https://github.com/astral-sh/ruff/pull/10910)
[lot](https://github.com/astral-sh/ruff/pull/10966)
[of](https://github.com/astral-sh/ruff/pull/10896)
[bugs](https://github.com/astral-sh/ruff/pull/10877)
---------
Co-authored-by: Victor Hugo Gomes <labatata101@linuxmail.org>
Co-authored-by: Micha Reiser <micha@reiser.io>
Add pylint rule invalid-length-returned (PLE0303)
See https://github.com/astral-sh/ruff/issues/970 for rules
Test Plan: `cargo test`
TBD: from the description: "Strictly speaking `bool` is a subclass of
`int`, thus returning `True`/`False` is valid. To be consistent with
other rules (e.g.
[PLE0305](https://github.com/astral-sh/ruff/pull/10962)
invalid-index-returned), ruff will raise, compared to pylint which will
not raise."
## Summary
If the user is analyzing a script (i.e., we have no module path), it
seems reasonable to use the script name when trying to identify paths to
objects defined _within_ the script.
Closes https://github.com/astral-sh/ruff/issues/10960.
## Test Plan
Ran:
```shell
check --isolated --select=B008 \
--config 'lint.flake8-bugbear.extend-immutable-calls=["test.A"]' \
test.py
```
On:
```python
class A: pass
def f(a=A()):
pass
```
## Summary
This PR switches more callsites of `SemanticModel::is_builtin` to move
over to the new methods I introduced in #10919, which are more concise
and more accurate. I missed these calls in the first PR.
