What's New in Pylint 2.15

Summary -- Release highlights

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.

Release date: 2022-08-25

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

Refs #6780 (#6780)

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

Closes #3975 (#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 (#4951)
Don't report no-value-for-parameter for dataclasses fields annotated with KW_ONLY.

Closes #5767 (#5767)
Fixed inference of Enums when they are imported under an alias.

Closes #5776 (#5776)
Prevent false positives when accessing PurePath.parents by index (not slice) on Python 3.10+.

Closes #5832 (#5832)
unnecessary-list-index-lookup is now more conservative to avoid potential false positives.

Closes #6896 (#6896)
Fix double emitting trailing-whitespace for multi-line docstrings.

Closes #6936 (#6936)
import-error now correctly checks for contextlib.suppress guards on import statements.

Closes #7270 (#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 (#7300)
Fix undefined-loop-variable with break and continue statements in else blocks.

Refs #7311 (#7311)

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

Closes #4624 (#4624)
Emit used-before-assignment for self-referencing named expressions (:=) lacking prior assignments.

Closes #5653 (#5653)
Emit used-before-assignment for self-referencing assignments under if conditions.

Closes #6643 (#6643)
Emit modified-iterating-list and analogous messages for dicts and sets when iterating literals, or when using the del keyword.

Closes #6648 (#6648)
Emit used-before-assignment when calling nested functions before assignment.

Closes #6812 (#6812)
Emit nonlocal-without-binding when a nonlocal name has been assigned at a later point in the same scope.

Closes #6883 (#6883)
Emit using-constant-test when testing the truth value of a variable or call result holding a generator.

Closes #6909 (#6909)
Rename unhashable-dict-key to unhashable-member and emit when creating sets and dicts, not just when accessing dicts.

Closes #7034, Closes #7055 (#7034)

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

Closes #1667 (#1667)
Fixed a syntax-error crash that was not handled properly when the declared encoding of a file was utf-9.

Closes #3860 (#3860)
Fix a crash in the not-callable check when there is ambiguity whether an instance is being incorrectly provided to __new__().

Closes #7109 (#7109)
Fix crash when regex option raises a re.error exception.

Closes #7202 (#7202)
Fix undefined-loop-variable from walrus in comprehension test.

Closes #7222 (#7222)
Check for <cwd> before removing first item from sys.path in modify_sys_path.

Closes #7231 (#7231)
Fix sys.path pollution in parallel mode.

Closes #7246 (#7246)
Prevent useless-parent-delegation for delegating to a builtin written in C (e.g. Exception.__init__) with non-self arguments.

Closes #7319 (#7319)

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

Closes #3694 (#3694)
The message for literal-comparison is now more explicit about the problem and the solution.

Closes #5237 (#5237)
useless-super-delegation has been renamed to useless-parent-delegation in order to be more generic.

Closes #6953 (#6953)
Pylint now uses towncrier for changelog generation.

Refs #6974 (#6974)
Update astroid to 2.12.

Refs #7153 (#7153)
Fix crash when a type-annotated __slots__ with no value is declared.

Closes #7280 (#7280)

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 (#6891)
pylint.testutils.primer is now a private API.

Refs #6905 (#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 (#6974)
Pylint is now using Scorecards to implement security recommendations from the OpenSSF. 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 (#7267)