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[RFE] warn about unused Pylint disablings #4757

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stanislavlevin opened this issue Jul 27, 2021 · 5 comments · Fixed by #4779
Closed

[RFE] warn about unused Pylint disablings #4757

stanislavlevin opened this issue Jul 27, 2021 · 5 comments · Fixed by #4779
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@Pierre-Sassoulas
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Discussion 🤔 Documentation 📗 Enhancement ✨ Improvement to a component
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2.10.0

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@stanislavlevin
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Current problem

The project which actively uses Pylint can contain many disabling of Pylint checkers via the code comments:
http://pylint.pycqa.org/en/latest/user_guide/message-control.html

  • this can significantly litter a code with tons of comments (Pylint, flake, mypy, etc., individually or all together)
  • this can hide actual code errors
  • slows down Pylint analysis

Desired solution

In my opinion, people disable checkers via the code comments in the next common cases:

  • unsupported Pylint feature
  • broken Pylint feature (for example, regression after upgrade)

I think it will be useful to have an option to check such disabling and report if disabling is no longer needed (only code comments).

Inspired by mypy's:

--warn-unused-ignores
This flag will make mypy report an error whenever your code uses a # type: ignore comment on a line that is not actually generating an error message.

This flag, along with the --warn-redundant-casts flag, are both particularly useful when you are upgrading mypy. Previously, you may have needed to add casts or # type: ignore annotations to work around bugs in mypy or missing stubs for 3rd party libraries.

These two flags let you discover cases where either workarounds are no longer necessary.

https://mypy.readthedocs.io/en/stable/command_line.html?highlight=unused-ignores#cmdoption-mypy-warn-unused-ignores

(Additional context)

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@stanislavlevin stanislavlevin added Enhancement ✨ Improvement to a component Needs triage 📥 Just created, needs acknowledgment, triage, and proper labelling labels Jul 27, 2021
@Pierre-Sassoulas
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Pierre-Sassoulas commented Jul 27, 2021 •
edited

This already exists you need enable=useless-suppression in the configuration. Maybe it should become a default or be more visible in the documentation, what do you think ?

@Pierre-Sassoulas Pierre-Sassoulas added Discussion 🤔 Documentation 📗 and removed Needs triage 📥 Just created, needs acknowledgment, triage, and proper labelling labels Jul 27, 2021
@stanislavlevin
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Note: double p in the name (useless-suppression) ;-)
It seems that this is exactly what I want. Unfortunately, I didn't find any docs on this.

@Pierre-Sassoulas
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Pierre-Sassoulas commented Jul 29, 2021 •
edited

Thanks for the correction :) Where would you expect to find it ? Or alternatively I think we could make this one a default message as it permits to really clean code when upgrading pylint.

@stanislavlevin
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In my opinion, as a default checker for relatively new projects it will be useful, but for old ones, this may be cumbersome at the very first time.
For example, in freeipa case:

[builder@localhost freeipa]$ grep -c useless-suppression log
152

though all of the occurrences will be fixed.

Probably, I would search for such functionality in
http://pylint.pycqa.org/en/latest/user_guide/message-control.html

@Pierre-Sassoulas Pierre-Sassoulas self-assigned this Jul 30, 2021
@Pierre-Sassoulas Pierre-Sassoulas added this to the 2.10.0 milestone Jul 30, 2021
Pierre-Sassoulas added a commit to Pierre-Sassoulas/pylint that referenced this issue Jul 31, 2021
@Pierre-Sassoulas
Add documentation for useless-suppression
ffcfa5d 
Closes pylint-dev#4757
@Pierre-Sassoulas Pierre-Sassoulas mentioned this issue Jul 31, 2021
Merged
Pierre-Sassoulas added a commit that referenced this issue Jul 31, 2021
@Pierre-Sassoulas
Add documentation for useless-suppression
a31e6bc 
Closes #4757
cdce8p added a commit to cdce8p/pylint that referenced this issue Aug 1, 2021
@cdce8p
PR 4783 - nested attributes
b0164a6 
Squashed commit of the following:

commit 49c4bba
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Sun Aug 1 19:56:51 2021 +0800

    Fix crash for `unused-private-member` when there are nested attributes

commit 2ad8247
Merge: 8ceb26d 1d09bc8
Author: yushao2 <36848472+yushao2@users.noreply.github.com>
Date:   Sun Aug 1 20:13:05 2021 +0800

    Merge pull request pylint-dev#4709 from yushao2/fix-unused-private-member-4673

    [unused-private-member] add logic for checking nested functions

commit 1d09bc8
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Sun Aug 1 20:03:42 2021 +0800

    update pr based on review

commit a4198cd
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Sun Aug 1 19:21:36 2021 +0800

    Update pr based on review

commit c8b2cbb
Author: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date:   Sun Jul 25 05:20:42 2021 +0000

    [pre-commit.ci] auto fixes from pre-commit.com hooks

    for more information, see https://pre-commit.ci

commit 4ffea0b
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Sun Jul 25 13:12:29 2021 +0800

    Update pr based on review

commit e4d6243
Author: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Date:   Sun Jul 18 17:23:31 2021 +0200

    Remove empty line

commit cce5833
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Sun Jul 18 22:40:54 2021 +0800

    update PR based on comments

commit 712dc2b
Author: Yu Shao, Pang <p.yushao2@gmail.com>
Date:   Wed Jul 14 16:42:25 2021 +0800

    [unused-private-member] add logic for checking nested functions

    also, improve error message for nested functions

commit 8ceb26d
Author: Michal Vasilek <michal@vasilek.cz>
Date:   Sun Aug 1 08:14:58 2021 +0200

    Fix IsADirectoryError in tests/lint/unittest_lint (pylint-dev#4781)

    pylintd is a directory, so os.remove throws IsADirectoryError

commit a31e6bc
Author: Pierre Sassoulas <pierre.sassoulas@gmail.com>
Date:   Sat Jul 31 11:21:46 2021 +0200

    Add documentation for useless-suppression

    Closes pylint-dev#4757

commit b71be8a
Author: Mark Byrne <31762852+mbyrnepr2@users.noreply.github.com>
Date:   Fri Jul 30 20:21:02 2021 +0200

    Handle has-a relationships for type-hinted arguments in class diagrams (pylint-dev#4745)

    * Pyreverse - Show class has-a relationships inferred from type-hints

    Closes pylint-dev#4744

    Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

commit 5e5f48d
Author: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
Date:   Thu Jul 29 23:44:30 2021 +0200

    Add ``forgotten-debug-statement`` checker (pylint-dev#4771)

    * Add ``no-breakpoint`` checker this adds a checker for calls to ``breakpoint()``, ``pdb.set_trace()``, or ``sys.breakpointhook()``.

    Closes pylint-dev#3692

    Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
    Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>
@stanislavlevin
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Great! Thank you!

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@Pierre-Sassoulas Pierre-Sassoulas

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Add documentation for useless-suppression Pierre-Sassoulas/pylint
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@Pierre-Sassoulas @stanislavlevin