v2.15.5

What's new in Pylint 2.15.5?

Release date: 2022-10-21

False Positives Fixed

• Fix a false positive for simplify-boolean-expression when multiple values
  are inferred for a constant.

  Closes #7626

Other Bug Fixes

• Remove __index__ dunder method call from unnecessary-dunder-call
  check.

  Closes #6795

• Fixed a multi-processing crash that prevents using any more than 1 thread on
  MacOS.

  The returned module objects and errors that were cached by the linter plugin loader cannot be reliably pickled. This means that dill would throw an error when attempting to serialise the linter object for multi-processing use.

  Closes #7635.

Other Changes

• Add a keyword-only compare_constants argument to safe_infer.

  Refs #7626

• Sort --generated-rcfile output.

  Refs #7655

v2.15.4

False Positives Fixed

• Fix the message for unnecessary-dunder-call for __aiter__ and
  __anext__. Also
  only emit the warning when py-version >= 3.10.

  Closes #7529

Other Bug Fixes

• Fix bug in detecting unused-variable when iterating on variable.

  Closes #3044

• Fixed handling of -- as separator between positional arguments and flags.
  This was not actually fixed in 2.14.5.

  Closes #7003, Refs #7096

• Report no-self-argument rather than no-method-argument for methods
  with variadic arguments.

  Closes #7507

• Fixed an issue where syntax-error couldn't be raised on files with
  invalid encodings.

  Closes #7522

• Fix false positive for redefined-outer-name when aliasing typing
  e.g. as t and guarding imports under t.TYPE_CHECKING.

  Closes #7524

• Fixed a crash of the modified_iterating checker when iterating on a set
  defined as a class attribute.

  Closes #7528

• Fix bug in scanning of names inside arguments to typing.Literal.
  See https://peps.python.org/pep-0586/#literals-enums-and-forward-references
  for details.

  Refs #3299

Other Changes

• Add method name to the error messages of no-method-argument and
  no-self-argument.

  Closes #7507

v2.15.3

• Fixed a crash in the unhashable-member checker when using a lambda as a dict key.

  Closes #7453

• Fix a crash in the modified-iterating-dict checker involving instance attributes.

  Closes #7461

• invalid-class-object does not crash anymore when __class__ is assigned alongside another variable.

  Closes #7467

• Fix false positive for global-variable-not-assigned when a global variable is re-assigned via an ImportFrom node.

  Closes #4809

• Fix false positive for undefined-loop-variable in for-else loops that use a function
  having a return type annotation of NoReturn or Never.

  Closes #7311

• --help-msg now accepts a comma-separated list of message IDs again.

  Closes #7471

v2.15.2

• Fixed a case where custom plugins specified by command line could silently fail.

  Specifically, if a plugin relies on the init-hook option changing sys.path before
  it can be imported, this will now emit a bad-plugin-value message. Before this
  change, it would silently fail to register the plugin for use, but would load
  any configuration, which could have unintended effects.

  Fixes part of #7264.

• Fix used-before-assignment for functions/classes defined in type checking guard.

  Closes #7368

• Update modified_iterating checker to fix a crash with for loops on empty list.

  Closes #7380

• The docparams extension now considers typing in Numpy style docstrings
  as "documentation" for the missing-param-doc message.

  Refs #7398

• Fix false positive for unused-variable and unused-import when a name is only used in a string literal type annotation.

  Closes #3299

• Fix false positive for too-many-function-args when a function call is assigned to a class attribute inside the class where the function is defined.

  Closes #6592

• Fix used-before-assignment for functions/classes defined in type checking guard.

  Closes #7368

• Fix ignored files being linted when passed on stdin.

  Closes #4354

• missing-return-doc, missing-raises-doc and missing-yields-doc now respect
  the no-docstring-rgx option.

  Closes #4743

• Don't crash on OSError in config file discovery.

  Closes #7169

• disable-next is now correctly scoped to only the succeeding line.

  Closes #7401

• Update modified_iterating checker to fix a crash with for loops on empty list.

  Closes #7380

v2.15.1

• Fix used-before-assignment for functions/classes defined in type checking guard.

  Closes #7368

• Update modified_iterating checker to fix a crash with for loops on empty list.

  Closes #7380

• The docparams extension now considers typing in Numpy style docstrings
  as "documentation" for the missing-param-doc message.

  Refs #7398

• Fix false positive for unused-variable and unused-import when a name is only used in a string literal type annotation.

  Closes #3299

• Fix false positive for too-many-function-args when a function call is assigned to a class attribute inside the class where the function is defined.

  Closes #6592

• Fix used-before-assignment for functions/classes defined in type checking guard.

  Closes #7368

• Fix ignored files being linted when passed on stdin.

  Closes #4354

• missing-return-doc, missing-raises-doc and missing-yields-doc now respect
  the no-docstring-rgx option.

  Closes #4743

• Don't crash on OSError in config file discovery.

  Closes #7169

• disable-next is now correctly scoped to only the succeeding line.

  Closes #7401

• Update modified_iterating checker to fix a crash with for loops on empty list.

  Closes #7380

v2.15.0

In pylint 2.15.0, we added a new check missing-timeout to warn of default timeout values that could cause a program to be hanging indefinitely.

We improved pylint's handling of namespace packages. More packages should be linted without resorting to using the --recursive=y option.

We still welcome any community effort to help review, integrate, and add good/bad examples to the doc for #5953. This should be doable without any pylint or astroid knowledge, so this is the perfect entrypoint if you want to contribute to pylint or open source without any experience with our code!

Internally, we changed the way we generate the release notes, thanks to DudeNr33. There will be no more conflict resolution to do in the changelog, and every contributor rejoice.

Marc Byrne became a maintainer, welcome to the team !

New Checks

• Added new checker missing-timeout to warn of default timeout values that could cause
  a program to be hanging indefinitely.

  Refs #6780

False Positives Fixed

• Don't report super-init-not-called for abstract __init__ methods.

  Closes #3975

• Don't report unsupported-binary-operation on Python <= 3.9 when using the | operator
  with types, if one has a metaclass that overloads __or__ or __ror__ as appropriate.

  Closes #4951

• Don't report no-value-for-parameter for dataclasses fields annotated with KW_ONLY.

  Closes #5767

• Fixed inference of Enums when they are imported under an alias.

  Closes #5776

• Prevent false positives when accessing PurePath.parents by index (not slice) on Python 3.10+.

  Closes #5832

• unnecessary-list-index-lookup is now more conservative to avoid potential false positives.

  Closes #6896

• Fix double emitting trailing-whitespace for multi-line docstrings.

  Closes #6936

• import-error now correctly checks for contextlib.suppress guards on import statements.

  Closes #7270

• Fix false positive for no-self-argument/no-method-argument when a staticmethod is applied to a function but uses a different name.

  Closes #7300

• Fix undefined-loop-variable with break and continue statements in else blocks.

  Refs #7311

False Negatives Fixed

• Emit used-before-assignment when relying on a name that is reimported later in a function.

  Closes #4624

• Emit used-before-assignment for self-referencing named expressions (:=) lacking
  prior assignments.

  Closes #5653

• Emit used-before-assignment for self-referencing assignments under if conditions.

  Closes #6643

• Emit modified-iterating-list and analogous messages for dicts and sets when iterating
  literals, or when using the del keyword.

  Closes #6648

• Emit used-before-assignment when calling nested functions before assignment.

  Closes #6812

• Emit nonlocal-without-binding when a nonlocal name has been assigned at a later point in the same scope.

  Closes #6883

• Emit using-constant-test when testing the truth value of a variable or call result
  holding a generator.

  Closes #6909

• Rename unhashable-dict-key to unhashable-member and emit when creating sets and dicts,
  not just when accessing dicts.

  Closes #7034, Closes #7055

Other Bug Fixes

• Fix a failure to lint packages with __init__.py contained in directories lacking __init__.py.

  Closes #1667

• Fixed a syntax-error crash that was not handled properly when the declared encoding of a file
  was utf-9.

  Closes #3860

• Fix a crash in the not-callable check when there is ambiguity whether an instance is being incorrectly provided to __new__().

  Closes #7109

• Fix crash when regex option raises a re.error exception.

  Closes #7202

• Fix undefined-loop-variable from walrus in comprehension test.

  Closes #7222

• Check for <cwd> before removing first item from sys.path in modify_sys_path.

  Closes #7231

• Fix sys.path pollution in parallel mode.

  Closes #7246

• Prevent useless-parent-delegation for delegating to a builtin
  written in C (e.g. Exception.__init__) with non-self arguments.

  Closes #7319

Other Changes

• bad-exception-context has been renamed to bad-exception-cause as it is about the cause and not the context.

  Closes #3694

• The message for literal-comparison is now more explicit about the problem and the
  solution.

  Closes #5237

• useless-super-delegation has been renamed to useless-parent-delegation in order to be more generic.

  Closes #6953

• Pylint now uses towncrier for changelog generation.

  Refs #6974

• Update astroid to 2.12.

  Refs #7153

• Fix crash when a type-annotated __slots__ with no value is declared.

  Closes #7280

Internal Changes

• Fixed an issue where it was impossible to update functional tests output when the existing
  output was impossible to parse. Instead of raising an error we raise a warning message and
  let the functional test fail with a default value.

  Refs #6891

• pylint.testutils.primer is now a private API.

  Refs #6905

• We changed the way we handle the changelog internally by using towncrier.
  If you're a contributor you won't have to fix merge conflicts in the
  changelog anymore.

  Closes #6974

• Pylint is now using Scorecards to implement security recommendations from the
  OpenSSF <https://openssf.org/>_. This is done in order to secure our supply chains using a combination
  of automated tooling and best practices, most of which were already implemented before.

  Refs #7267

v2.14.5

• Fixed a crash in the undefined-loop-variable check when enumerate() is used
  in a ternary expression.

  Closes #7131

• Fixed handling of -- as separator between positional arguments and flags.

  Closes #7003

• Fixed the disabling of fixme and its interaction with useless-suppression.

• Allow lists of default values in parameter documentation for Numpy style.

  Closes #4035

v2.14.4

• The differing-param-doc check was triggered by positional only arguments.

  Closes #6950

• Fixed an issue where scanning . directory recursively with --ignore-path=^path/to/dir is not
  ignoring the path/to/dir directory.

  Closes #6964

• Fixed regression that didn't allow quoted init-hooks in option files.

  Closes #7006

• Fixed a false positive for modified-iterating-dict when updating an existing key.

  Closes #6179

• Fixed an issue where many-core Windows machines (>~60 logical processors) would hang when
  using the default jobs count.

  Closes #6965

• Fixed an issue with the recognition of setup.cfg files.
  Only .cfg files that are exactly named setup.cfg require section names that
  start with pylint..

  Closes #3630

• Don't report import-private-name for relative imports.

  Closes #7078

v2.14.3

• Fixed two false positives for bad-super-call for calls that refer to a non-direct parent.

  Closes #4922, Closes #2903

• Fixed a false positive for useless-super-delegation for subclasses that specify the number of
  of parameters against a parent that uses a variadic argument.

  Closes #2270

• Allow suppressing undefined-loop-variable and undefined-variable without raising useless-suppression.

• Fixed false positive for undefined-variable for __class__ in inner methods.

  Closes #4032

v2.14.2

• Fixed a false positive for unused-variable when a function returns an
  argparse.Namespace object.

  Closes #6895

• Avoided raising an identical undefined-loop-variable message twice on the same line.

• Don't crash if lint.run._query_cpu() is run within a Kubernetes Pod, that has only
  a fraction of a cpu core assigned. Just go with one process then.

  Closes #6902

• Fixed a false positive in consider-using-f-string if the left side of a % is not a string.

  Closes #6689

• Fixed a false positive in unnecessary-list-index-lookup and unnecessary-dict-index-lookup
  when the subscript is updated in the body of a nested loop.

  Closes #6818

• Fixed an issue with multi-line init-hook options which did not record the line endings.

  Closes #6888

• Fixed a false positive for used-before-assignment when a try block returns
  but an except handler defines a name via type annotation.

• --errors-only no longer enables previously disabled messages. It was acting as
  "emit all and only error messages" without being clearly documented that way.

  Closes #6811