Release branch 3.3.0

[Pierre-Sassoulas]

What's new in Pylint 3.3.0?

Release date: 2024-09-20

Changes requiring user actions

• We migrated symilar to argparse, from getopt, so the error and help output changed
  (for the better). We exit with 2 instead of sometime 1, sometime 2. The error output
  is not captured by the runner anymore. It's not possible to use a value for the
  boolean options anymore (--ignore-comments 1 should become --ignore-comments).

  Refs [symilar] Migrate from getopt to argparse #9731

New Features

• Add new declare-non-slot error which reports when a class has a __slots__ member and a type hint on the class is not present in __slots__.

  Refs Check "__slots__" and "@dataclass" attributes #9499

New Checks

• Added too-many-positional-arguments to allow distinguishing the configuration for too many
  total arguments (with keyword-only params specified after *) from the configuration
  for too many positional-or-keyword or positional-only arguments.

  As part of evaluating whether this check makes sense for your project, ensure you
  adjust the value of --max-positional-arguments.

  Closes [feature request] New warning: too many positional arguments #9099

• Add using-exception-group-in-unsupported-version and
  using-generic-type-syntax-in-unsupported-version for uses of Python 3.11+ or
  3.12+ features on lower supported versions provided with --py-version.

  Closes Add check for using major 3.11 and 3.12 features with lower --py-version #9791

• Add using-assignment-expression-in-unsupported-version for uses of := (walrus operator)
  on Python versions below 3.8 provided with --py-version.

  Closes Assign expression / walrus operator is 3.8+ #9820

• Add using-positional-only-args-in-unsupported-version for uses of positional-only args on
  Python versions below 3.8 provided with --py-version.

  Closes Positional-only parameters are 3.8+ #9823

• Add unnecessary-default-type-args to the typing extension to detect the use
  of unnecessary default type args for typing.Generator and typing.AsyncGenerator.

  Refs Add check for unnecessary-default-type-args #9938

False Negatives Fixed

• Fix computation of never-returning function: Never is handled in addition to NoReturn, and priority is given to the explicit --never-returning-functions option.

  Closes typing_extensions assert_never's Never not supported #7565.

• Fix a false negative for await-outside-async when await is inside Lambda.

  Refs Also check Lambda for await-outside-async #9653

• Fix a false negative for duplicate-argument-name by including positional-only, *args and **kwargs arguments in the check.

  Closes False negatives for duplicate-argument-name #9669

• Fix false negative for multiple-statements when multiple statements are present on else and finally lines of try.

  Refs multiple-statements no longer detected in a finally: block #9759

• Fix false negatives when isinstance does not have exactly two arguments.
  pylint now emits a too-many-function-args or no-value-for-parameter
  appropriately for isinstance calls.

  Closes False negative: Wrong number of arguments for isinstance #9847

Other Bug Fixes

• --enable with --disable=all now produces an error, when an unknown msg code is used. Internal pylint messages are no longer affected by --disable=all.

  Closes [unknown-option-value] False negative after --disable=all #9403

• Impossible to compile regexes for paths in the configuration or argument given to pylint won't crash anymore but
  raise an argparse error and display the error message from re.compile instead.

  Closes Gracefully handle invalid ‘ignore-paths’ regex crash #9680

• Fix a bug where a tox.ini file with pylint configuration was ignored and it exists in the current directory.

  .cfg and .ini files containing a Pylint configuration may now use a section named [pylint]. This enhancement impacts the scenario where these file types are used as defaults when they are present and have not been explicitly referred to, using the --rcfile option.

  Closes pylint not finding the tox.ini config #9727

• Improve file discovery for directories that are not python packages.

  Closes pylint doesn't continue searching for files under a directory that is not a package #9764

Other Changes

• Remove support for launching pylint with Python 3.8.
  Code that supports Python 3.8 can still be linted with the --py-version=3.8 setting.

  Refs Drop support for Python 3.8 #9774

• Add support for Python 3.13.

  Refs Support Python 3.13 #9852

Internal Changes

• All variables, classes, functions and file names containing the word 'similar', when it was,
  in fact, referring to 'symilar' (the standalone program for the duplicate-code check) were renamed
  to 'symilar'.

  Closes Correct similar to symilar when talking about the standalone script #9734

• Remove old-style classes (Python 2) code and remove check for new-style class since everything is new-style in Python 3. Updated doc for exception checker to remove reference to new style class.

  Refs Remove old-style classes code, remove check for new-style class #9925

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.80%. Comparing base (78f3dfa) to head (2893a6a).
Report is 76 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9940   +/-   ##
=======================================
  Coverage   95.80%   95.80%           
=======================================
  Files         174      174           
  Lines       18940    18940           
=======================================
  Hits        18146    18146           
  Misses        794      794           

Files with missing lines	Coverage Δ
pylint/__pkginfo__.py	100.00% <100.00%> (ø)

[github-actions]

🤖 According to the primer, this change has no effect on the checked open source code. 🤖🎉

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