Implement Pylint #970

charliermarsh · 2022-11-30T04:52:53Z

This is the parent issue for tracking parity with Pylint. Below, we've enumerated all Pylint rules.

Rules that are checked off have been implemented in Ruff already (either as a Pylint rule, e.g., PLE0237, or by way of overlap with another linter like Pyflakes, as with missing-format-string-key).

Rules that are crossed out have been removed some consideration. (In most cases, crossed-out rules represent Pylint specific rules, e.g., rules related to Pylint configuration.)

At time of writing, many of the remaining rules require type inference and/or multi-file analysis, and aren't ready to be implemented in Ruff. (See: #970 (comment) for an enumeration.) If you're looking to start work on a specific rule, I'd suggest commenting in the issue, to get some input on whether Ruff is capable of supporting it at present.

For guidance on getting started, see the Contributing documentation.

Note: Don't implement rules that are part of Pylint extension until #1774 is completed. Don't implement rules that mainly target Python 2.

Error

Warning

Convention

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charliermarsh · 2022-11-30T05:26:33Z

Need to figure out what the right "check code" approach is here. We could just start to put these under RUF. Or we could do PYE for "Pylint Error", and so on. Or we could use PYL for all of them. In either case, though, we have to allow four-digit codes, as opposed to our current three-digit codes.

JonathanPlasse · 2022-11-30T06:28:59Z

I vote for PYE as it would keep the same categories and the migration would be easier.

harupy · 2022-12-01T03:49:24Z

I'll work on unneeded-not this weekend.

relsunkaev · 2022-12-01T07:27:04Z

I would suggest PL as the pylint prefix (PLE -> PyLint Error). I think PYE might be a bit ambiguous with PYflakes, PYdocstyle, etc.

MartinBernstorff · 2022-12-01T09:33:12Z

Would absolutely love to see this happen. I know flake8 intentionally decided not to implement e.g. unexpected-keyword-arg because it required looking outside of the current file for imported functions.

I expect you've already considered this, and really hope this won't stop ruff from implementing it, but just wanted to raise it.

charliermarsh · 2022-12-01T15:22:58Z

@relsunkaev 👍 Went with PLE! The first code is checked in as PLE1142 (matching E1142 from Pylint).

charliermarsh · 2022-12-01T15:23:31Z

@MartinBernstorff - Definitely. The multi-file stuff will come, just not as quickly.

hmc-cs-mdrissi · 2022-12-08T02:41:23Z

Not sure if it should be separate issue, but looking at missing-function-docstring rule (C0116), pylint's version of it is different. It only requires that a function has docstring some in class hierarchy and does not require over-ridden methods to have a docstring. As an example,

class Foo:
  def validate(self):
    """Doc."""
    ...

class Bar(Foo):
  def validate(self):
    ...

gives no errors in pylint even though second validate is missing docstring being pylint allows inheriting one. This is very useful when implementing interface and the docstring would really be same for all things that subclass.

charliermarsh · 2023-01-05T18:53:47Z

I'd like to get pointless-statement, unnecessary-ellipsis, and unnecessary-pass in.

charliermarsh · 2023-01-05T19:20:12Z

Relevant source for defining a pointless-statement: https://github.com/PyCQA/pylint/blob/56121344f6c9c223d8e4477c0cdb58c46c840b4b/pylint/checkers/base/basic_checker.py#L447

thejcannon · 2023-01-12T16:08:49Z

A while ago I set out to find all the pylint codes make redundant by type checking.

Unfortunately that code got lost to the sands of time.

You might consider skipping those as type checking tools are very sophisticated, if you can do the effort of compiling that list

thejcannon · 2023-01-12T16:14:48Z

I've also thought very long and hard about the fact that pylint appears very sophisticated when it comes to types because it builds on astroid which works very hard to infer types based on code (pre-type-annotations)

Ideally ruff (or any modern linter) is type-aware to be as helpful as possible, but that requires either:

A Rust-implemented type checkers for Python. Short of a large company writing and maintaining this I doubt it'll keep up with the other big dogs
Having the type information be seeded to ruff. Aside from the overhead and protocol, this actually seems feasible.

dae · 2023-01-12T22:32:06Z

For what it's worth, the type awareness of pylint is the killer feature that keeps us using it in our project despite how painfully slow it is. Our first-party code is almost fully typed, and mypy is generally good at catching typing issues. We've found multiple instances where pylint caught an issue that mypy missed however - usually in third-party code with missing or incomplete type definitions, but occasionally also in our own code when mypy doesn't notice (eg due to the presence of __getattr__: python/mypy#6251).

thejcannon · 2023-01-12T22:41:02Z

Out of curiosity, have you tried pyright? It claims to have inference support for codebases that aren't fully typed.

dae · 2023-01-12T22:49:36Z

Mypy has a check_untyped_defs which sounds equivalent, and we use that. We currently rely on mypy's no_strict_optional which pyright has no equivalent to, so pyright is not currently usable on our codebase.

This PR adds [Pylint `R2004`](https://pylint.pycqa.org/en/latest/user_guide/messages/refactor/magic-value-comparison.html#magic-value-comparison-r2004) Feel free to suggest changes and additions, I have tried to maintain parity with the Pylint implementation [`magic_value.py`](https://github.com/PyCQA/pylint/blob/main/pylint/extensions/magic_value.py) See #970

pcorpet · 2024-09-19T07:50:31Z

Here is the script I'm using to help us migrate our Pylint config to Ruff.
https://gist.github.com/pcorpet/e776a8e794264b818c9cc6d06c11ef15

edreamleo · 2024-09-25T15:07:20Z

@charliermarsh Thank you for this tracking issue! I still use pylint because Ruff does not report no-member, as in:

class Cmdr:

    def __init__(self):
        self.a = None

class Client:

    def __init__(self):
        self.c = Cmdr()
        print(self.c.y)  # No member c.y.

    def test_c_dot_x(self):
        print(self.c.x)  # No member c.x.

II would be happy if Ruff ran slower provided Ruff could handle type inference. YMMV.

zanieb · 2024-09-25T15:16:29Z

@edreamleo we're working on type inference right now! It's a big project though :) You can follow progress with the red-knot Multi-file analysis & type inference label.

edreamleo · 2024-09-25T17:57:03Z

@zanieb Thanks for your comment! I've bookmarked red-knot.

## Summary  Related to #970. Implement [`shallow-copy-environ / W1507`](https://pylint.readthedocs.io/en/stable/user_guide/messages/warning/shallow-copy-environ.html). ## Test Plan  Unit test --------- Co-authored-by: Simon Brugman <sbrugman@users.noreply.github.com> Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

bebound · 2024-11-20T08:27:42Z

Could you please add possibly-used-before-assignment / E0606 to the list?

Ref: https://pylint.pycqa.org/en/stable/user_guide/messages/error/possibly-used-before-assignment.html

MichaReiser · 2024-11-20T08:40:14Z

@bebound I don't think we can implement this rule without precise control flow analysis. We already have a similar rule in red knot, our new static analysis backend that we plan on using in ruff long-term.

bebound · 2024-11-21T04:21:08Z

@MichaReiser Thanks for the reply.

Find a minor issue in the mapping list:

- use-dict-literal / R1735 (C406)
+ use-dict-literal / R1735 (C406, C408)
- use-list-literal / R1734 (C405)
+ use-list-literal / R1734 (C408)

C408 checks dict(), list() and tuple().
C405 is unnecessary-literal-set, which converts code to set literal and is not the target of use-list-literal. Not sure if C408 is a superset of R1734.

Ref:
C405: https://docs.astral.sh/ruff/rules/unnecessary-literal-set/
C406: https://docs.astral.sh/ruff/rules/unnecessary-literal-dict/
C408: https://docs.astral.sh/ruff/rules/unnecessary-collection-call/
C411: https://docs.astral.sh/ruff/rules/unnecessary-list-call/

R1735:https://pylint.readthedocs.io/en/stable/user_guide/messages/refactor/use-dict-literal.html
R1734: https://pylint.readthedocs.io/en/stable/user_guide/messages/refactor/use-list-literal.html

This could be slightly controversial, but submitted as a DRAFT for discussion. The case for pylint deprecation: - mostly covered by ruff: what matters most in pylint is already re-implemented - pylint is SLOW, ruff is a million times faster - pre-commit / pylint is one of our longest, most expensive CI step - rules are currently scattered in different places and can conflict at times Very relevant is this link that explains what pylint features are covered or not by ruff: astral-sh/ruff#970 If we agree on the direction, the plan is to follow up and enable all the rules, apply `ruff check --fix` and `ruff check --add-no-qa` Simplify.

alexisdrakopoulos · 2024-12-03T12:53:30Z

I know that mypy deals with E1101 but we are unable to use mypy at the moment, are there any plans for implementing it in Ruff?

NeilGirdhar · 2024-12-03T19:26:11Z

You can mark off W2301. It is covered by PIE790 [*] Unnecessary ... literal.

@alexisdrakopoulos My guess is you'll have to wait for static typing to be completed. Maybe track: "Static type checking à la mypy " (don't want to link it here)

charliermarsh added the rule Implementing or modifying a lint rule label Nov 30, 2022

charliermarsh mentioned this issue Nov 30, 2022

How does ruff compare to pylint? #689

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charliermarsh mentioned this issue Nov 30, 2022

Implement await-outside-async / E1142 #972

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charliermarsh added plugin Implementing a known but unsupported plugin and removed rule Implementing or modifying a lint rule labels Dec 31, 2022

sbdchd mentioned this issue Jan 2, 2023

Implement flake8-pie #1543

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max0x53 mentioned this issue Jan 12, 2023

Implement PLR2004 (MagicValueComparison) #1828

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ahobeost mentioned this issue Sep 30, 2024

Switch to Ruff for code quality SPF-OST/pytrnsys_gui#546

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Quexington mentioned this issue Sep 30, 2024

Replace pylint with ruff Chia-Network/chia-blockchain#18649

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emdneto mentioned this issue Oct 13, 2024

Introducing ruff as linter and formatter (basic setup) open-telemetry/opentelemetry-python#4223

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diceroll123 mentioned this issue Oct 14, 2024

new rule - enforce that loop variables are not used outside the loop #13742

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[CHIA-1553] Replace pylint with ruff Chia-Network/chia-blockchain#18759

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LordAro mentioned this issue Nov 6, 2024

B018 does not detect unused tuple expressions #14131

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harupy mentioned this issue Nov 10, 2024

[pylint] Implement shallow-copy-environ (W1507) #14241

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bebound mentioned this issue Nov 15, 2024

{Pylint} Fix superfluous-parens Azure/azure-cli#30361

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{Pylint} Fix consider-using-in Azure/azure-cli#30349

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Update to pylint 3.3 lektor/lektor#1208

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{Pylint} Fix use-dict-literal Azure/azure-cli#30308

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Code refactoring and speed optimizations SanGreel/telegram-data-collection#24

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Documentation with complete rulesets and parity information #14651

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Implement Pylint #970

Implement Pylint #970

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Implement Pylint #970

Implement Pylint #970

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