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[pylint] Implement singledispatch-method (E1519) #10140

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Glyphack
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@Glyphack Glyphack commented Feb 26, 2024

Implementing the rule
https://pylint.readthedocs.io/en/stable/user_guide/messages/error/singledispatch-method.html#singledispatch-method-e1519

Implementation simply checks the function type and name of the decorators.

@Glyphack Glyphack force-pushed the pytlint/singledispatch-method-E1519 branch 2 times, most recently from bf7f97b to 3a5e666 Compare February 28, 2024 19:04
@Glyphack Glyphack changed the title Implement pylint E1519 singledispatch-method #970 linter: Implement pylint E1519 singledispatch-method #970 Feb 28, 2024
@Glyphack Glyphack marked this pull request as ready for review February 28, 2024 19:05
@Glyphack Glyphack force-pushed the pytlint/singledispatch-method-E1519 branch from 3a5e666 to 3111e95 Compare February 28, 2024 19:42
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github-actions bot commented Feb 28, 2024

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+0 -3 violations, +0 -0 fixes in 1 projects; 42 projects unchanged)

pandas-dev/pandas (+0 -3 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- pandas/_libs/tslibs/period.pyi:57:5: PLR0917 Too many positional arguments (9/5)
- pandas/_libs/tslibs/period.pyi:73:1: PLR0904 Too many public methods (24 > 20)
- pandas/_libs/tslibs/period.pyi:79:9: PLR0917 Too many positional arguments (10/5)

Changes by rule (2 rules affected)

code total + violation - violation + fix - fix
PLR0917 2 0 2 0 0
PLR0904 1 0 1 0 0

/// Checks for singledispatch decorators on class methods.
///
/// ## Why is this bad?
/// Single dispatch must happen on the type of first non self argument
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Example code is helpful here. Take a look at other rules to see the format. The pylint docs contains examples to use.

You can also link the Python documentation of singledispatchmethod


@singledispatch # [singledispatch-method]
def move(self, position):
pass
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Is it possible to catch @funcname.register as the pylint rule does?

Even if not, it would be good to include those examples in the tests in case we can do it in the future.

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Probably a bit harder (but possible) to catch @funcname.register, but agree we should add tests for it with commentary.

@charliermarsh charliermarsh added rule Implementing or modifying a lint rule preview Related to preview mode features labels Feb 29, 2024
@charliermarsh charliermarsh changed the title linter: Implement pylint E1519 singledispatch-method #970 [pylint] Implement singledispatch-method (E1519) Mar 1, 2024
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Gonna address feedback and merge.

@charliermarsh charliermarsh force-pushed the pytlint/singledispatch-method-E1519 branch from 1c52b00 to 1dbb6ae Compare March 1, 2024 02:02
@charliermarsh charliermarsh enabled auto-merge (squash) March 1, 2024 02:02
@charliermarsh charliermarsh force-pushed the pytlint/singledispatch-method-E1519 branch from 1dbb6ae to 6702c4d Compare March 1, 2024 02:04
@charliermarsh charliermarsh force-pushed the pytlint/singledispatch-method-E1519 branch from 3d75d73 to c814776 Compare March 1, 2024 02:15
@charliermarsh charliermarsh merged commit cbafae0 into astral-sh:main Mar 1, 2024
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@Glyphack Glyphack deleted the pytlint/singledispatch-method-E1519 branch March 1, 2024 08:50
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Glyphack commented Mar 1, 2024

Thanks for addressing the comments 😃

nkxxll pushed a commit to nkxxll/ruff that referenced this pull request Mar 10, 2024
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3 participants