This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pylint (changelog)	`==2.3.1` -> `==2.17.7`

Release Notes

pylint-dev/pylint (pylint)

`v2.17.7`

Compare Source

2.17.7 is the last release before we only support pylint 3.0.0 or superior and python 3.8 or superior.

False Positives Fixed

Fix a regression in pylint 2.17.6 / astroid 2.15.7 causing various messages for code involving TypeVar.

Closes #9069

Other Bug Fixes

Fix crash in refactoring checker when unary operand used with variable in for loop.

Closes #9074

Other Bug Fixes

When parsing comma-separated lists of regular expressions in the config, ignore commas that are inside braces since those indicate quantifiers, not delineation between expressions.

Closes #7229
sys.argv is now always correctly considered as impossible to infer (instead of using the actual values given to pylint).

Closes #9047
Don't show class fields more than once in Pyreverse diagrams.

Closes #8189
Don't show arrows more than once in Pyreverse diagrams.

Closes #8522
Don't show duplicate type annotations in Pyreverse diagrams.

Closes #8888
Don't add Optional to | annotations with None in Pyreverse diagrams.

Closes #9014

What's new in Pylint 2.17.5?

Release date: 2023-07-26

False Positives Fixed

Fix a false positive for unused-variable when there is an import in a if TYPE_CHECKING: block and allow-global-unused-variables is set to no in the configuration.

Closes #8696
Fix false positives generated when supplying arguments as **kwargs to IO calls like open().

Closes #8719
Fix a false positive where pylint was ignoring method calls annotated as NoReturn during the inconsistent-return-statements check.

Closes #8747
Exempt parents with only type annotations from the invalid-enum-extension message.

Closes #8830

Other Bug Fixes

Fixed crash when a call to super() was placed after an operator (e.g. not).

Closes #8554
Fix crash for modified-while-iterating checker when deleting members of a dict returned from a call.

Closes #8598
Fix crash in invalid-metaclass check when a metaclass had duplicate bases.

Closes #8698
Avoid consider-using-f-string on modulos with brackets in template.

Closes #8720.
Fix a crash when __all__ exists but cannot be inferred.

Closes #8740
Fix crash when a variable is assigned to a class attribute of identical name.

Closes #8754
Fixed a crash when calling copy.copy() without arguments.

Closes #8774

Other Changes

Fix a crash when a nonlocal is defined at module-level.

Closes #8735

False Positives Fixed

Fix a false positive for bad-dunder-name when there is a user-defined __index__ method.

Closes #8613

Other Bug Fixes

pyreverse: added escaping of vertical bar character in annotation labels produced by DOT printer to ensure it is not treated as field separator of record-based nodes.

Closes #8603
Fixed a crash when generating a configuration file: tomlkit.exceptions.TOMLKitError: Can't add a table to a dotted key caused by tomlkit v0.11.8.

Closes #8632

What's new in Pylint 2.17.3?

Release date: 2023-04-24

False Positives Fixed

Fix unused-argument false positive when __new__ does not use all the arguments of __init__.

Closes #3670
Fix unused-import false positive for usage of six.with_metaclass.

Closes #7506
logging-not-lazy is not longer emitted for explicitly concatenated string arguments.

Closes #8410
Fix false positive for isinstance-second-argument-not-valid-type when union types contains None.

Closes #8424
Fixed unused-import so that it observes the dummy-variables-rgx option.

Closes #8500
Union typed variables without assignment are no longer treated as TypeAlias.

Closes #8540
Fix false positive for positional-only-arguments-expected when a function contains both a positional-only parameter that has a default value, and **kwargs.

Closes #8555
Fix false positive for keyword-arg-before-vararg when a positional-only parameter with a default value precedes *args.

Closes #8570

Other Bug Fixes

Improve output of consider-using-generator message for min()` calls with default`` keyword.

Closes #8563

False Positives Fixed

invalid-name now allows for integers in typealias names:
- now valid: Good2Name, GoodName2.
- still invalid: _1BadName.
Closes #8485
No longer consider Union as type annotation as type alias for naming checks.

Closes #8487
unnecessary-lambda no longer warns on lambdas which use its parameters in their body (other than the final arguments), e.g. lambda foo: (bar if foo else baz)(foo).

Closes #8496

Other Bug Fixes

Fix a crash in pyreverse when "/" characters are used in the output filename e.g pyreverse -o png -p name/ path/to/project.

Closes #8504

False Positives Fixed

Adds asyncSetUp to the default defining-attr-methods list to silence attribute-defined-outside-init warning when using unittest.IsolatedAsyncioTestCase.

Refs #8403

Other Bug Fixes

--clear-cache-post-run now also clears LRU caches for pylint utilities holding references to AST nodes.

Closes #8361
Fix a crash when TYPE_CHECKING is used without importing it.

Closes #8434
Fix a regression of preferred-modules where a partial match was used instead of the required full match.

Closes #8453

Internal Changes

The following utilities are deprecated in favor of the more robust in_type_checking_block and will be removed in pylint 3.0:
- is_node_in_guarded_import_block
- is_node_in_typing_guarded_import_block
- is_typing_guard
is_sys_guard is still available, which was part of is_node_in_guarded_import_block.

Refs #8433

`v2.17.0`

Compare Source

2.17 is a small release that is the first to support python 3.11 officially with the addition of TryStar nodes.

There's still two new default checks: bad-chained-comparison and implicit-flag-alias, one of them already fixed a previously undetected bug in sentry.

Thanks to the community effort our documentation is almost complete, and almost all messages should have a proper documentation now. A big thank you to everyone who participated !

The next release is going to be 3.0.0, bring breaking changes and enact long announced deprecations. There's going to be frequent beta releases, before the official releases, everyone is welcome to try the betas so we find problems before the actual release.

What's new in Pylint 2.17.0?

Release date: 2023-03-08

New Features

pyreverse now supports custom color palettes with the --color-palette option.

Closes #6738
Add invalid-name check for TypeAlias names.

Closes #7081
Accept values of the form <class name>.<attribute name> for the exclude-protected list.

Closes #7343
Add --version option to pyreverse.

Refs #7851
Adds new functionality with preferred-modules configuration to detect submodules.

Refs #7957
Support implicit namespace packages (PEP 420).

Closes #8154
Add globbing pattern support for --source-roots.

Closes #8290
Support globbing pattern when defining which file/directory/module to lint.

Closes #8310
pylint now supports TryStar nodes from Python 3.11 and should be fully compatible with Python 3.11.

Closes #8387

New Checks

Add a bad-chained-comparison check that emits a warning when there is a chained comparison where one expression is semantically incompatible with the other.

Closes #6559
Adds an implicit-flag-alias check that emits a warning when a class derived from enum.IntFlag assigns distinct integer values that share common bit positions.

Refs #8102

False Positives Fixed

Fix various false positives for functions that return directly from structural pattern matching cases.

Closes #5288
Fix false positive for used-before-assignment when typing.TYPE_CHECKING is used with if/elif/else blocks.

Closes #7574
Fix false positive for isinstance-second-argument-not-valid-type with union types.

Closes #8205
Fix false positive for used-before-assignment for named expressions appearing after the first element in a list, tuple, or set.

Closes #8252
Fix false positive for wrong-spelling-in-comment with class names in a python 2 type comment.

Closes #8370

False Negatives Fixed

Fix a false negative for 'missing-parentheses-for-call-in-test' when inference failed for the internal of the call as we did not need that information to raise correctly.

Refs #8185
Fix false negative for inconsistent-returns with while-loops.

Closes #8280

Other Bug Fixes

Fix used-before-assignment false positive when the walrus operator is used with a ternary operator in dictionary key/value initialization.

Closes #8125
Fix no-name-in-module false positive raised when a package defines a variable with the same name as one of its submodules.

Closes #8148
Fix a crash happening for python interpreter < 3.9 following a failed typing update.

Closes #8161
Fix nested-min-max suggestion message to indicate it's possible to splat iterable objects.

Closes #8168
Fix a crash happening when a class attribute was negated in the start argument of an enumerate.

Closes #8207
Prevent emitting invalid-name for the line on which a global statement is declared.

Closes #8307

Other Changes

Update explanation for global-variable-not-assigned and add confidence.

Closes #5073
The governance model and the path to become a maintainer have been documented as part of our effort to guarantee that the software supply chain in which pylint is included is secure.

Refs #8329

`v2.16.4`

Compare Source

False Positives Fixed

Fix false positive for isinstance-second-argument-not-valid-type with union types.

Closes #8205

`v2.16.3`

Compare Source

False Positives Fixed

Fix false positive for wrong-spelling-in-comment with class names in a python 2 type comment.

Closes #8370

Other Bug Fixes

Prevent emitting invalid-name for the line on which a global statement is declared.

Closes #8307

`v2.16.2`

Compare Source

New Features

Add --version option to pyreverse.

Refs #7851

False Positives Fixed

Fix false positive for used-before-assignment when typing.TYPE_CHECKING is used with if/elif/else blocks.

Closes #7574
Fix false positive for used-before-assignment for named expressions appearing after the first element in a list, tuple, or set.

Closes #8252

Other Bug Fixes

Fix used-before-assignment false positive when the walrus operator is used with a ternary operator in dictionary key/value initialization.

Closes #8125
Fix no-name-in-module false positive raised when a package defines a variable with the same name as one of its submodules.

Closes #8148
Fix nested-min-max suggestion message to indicate it's possible to splat iterable objects.

Closes #8168
Fix a crash happening when a class attribute was negated in the start argument of an enumerate.

Closes #8207

`v2.16.1`

Compare Source

Other Bug Fixes

Fix a crash happening for python interpreter < 3.9 following a failed typing update.

Closes #8161

`v2.16.0`

Compare Source

Summary -- Release highlights

In 2.16.0 we added aggregation and composition understanding in pyreverse, and a way to clear the cache in between run in server mode (originally for the VS Code integration). Apart from the bug fixes there's also a lot of new checks, and new extensions that have been asked for for a long time that were implemented.

If you want to benefit from all the new checks load the following plugins::

pylint.extensions.dict_init_mutate,
pylint.extensions.dunder,
pylint.extensions.typing,
pylint.extensions.magic_value,

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!

Last but not least @clavedeluna and @nickdrozd became triagers, welcome to the team !

What's new in Pylint 2.16.0?

Changes requiring user actions

The accept-no-raise-doc option related to missing-raises-doc will now be correctly taken into account all the time.

Pylint will no longer raise missing-raises-doc (W9006) when no exceptions are documented and accept-no-raise-doc is true (issue #7208). If you were expecting missing-raises-doc errors to be raised in that case, you will now have to add accept-no-raise-doc=no in your configuration to keep the same behavior. Closes #7208

New Features

Added the no-header output format. If enabled with --output-format=no-header, it will not include the module name in the output. Closes #5362
Added configuration option clear-cache-post-run to support server-like usage. Use this flag if you expect the linted files to be altered between runs. Refs #5401
Add --allow-reexport-from-package option to configure the useless-import-alias check not to emit a warning if a name is reexported from a package. Closes #6006
Update pyreverse to differentiate between aggregations and compositions. pyreverse checks if it's an Instance or a Call of an object via method parameters (via type hints) to decide if it's a composition or an aggregation. Refs #6543

New Checks

Adds a pointless-exception-statement check that emits a warning when an Exception is created and not assigned, raised or returned. Refs #3110
Add a shadowed-import message for aliased imports. Closes #4836
Add new check called unbalanced-dict-unpacking to check for unbalanced dict unpacking in assignment and for loops. Closes #5797
Add new checker positional-only-arguments-expected to check for cases when positional-only arguments have been passed as keyword arguments. Closes #6489
Added singledispatch-method which informs that @singledispatch should decorate functions and not class/instance methods. Added singledispatchmethod-function which informs that @singledispatchmethod should decorate class/instance methods and not functions. Closes #6917
Rename broad-except to broad-exception-caught and add new checker broad-exception-raised which will warn if general exceptions BaseException or Exception are raised. Closes #7494
Added nested-min-max which flags min(1, min(2, 3)) to simplify to min(1, 2, 3). Closes #7546
Extended use-dict-literal to also warn about call to dict() when passing keyword arguments. Closes #7690
Add named-expr-without-context check to emit a warning if a named expression is used outside a context like if, for, while, or a comprehension. Refs #7760
Add invalid-slice-step check to warn about a slice step value of 0 for common builtin sequences. Refs #7762
Add consider-refactoring-into-while-condition check to recommend refactoring when a while loop is defined with a constant condition with an immediate if statement to check for break condition as a first statement. Closes #8015

Extensions

Add new extension checker dict-init-mutate that flags mutating a dictionary immediately after the dictionary was created. Closes #2876
Added bad-dunder-name extension check, which flags bad or misspelled dunder methods. You can use the good-dunder-names option to allow specific dunder names. Closes #3038
Added consider-using-augmented-assign check for CodeStyle extension which flags x = x + 1 to simplify to x += 1. This check is disabled by default. To use it, load the code style extension with load-plugins=pylint.extensions.code_style and add consider-using-augmented-assign in the enable option. Closes #3391
Add magic-number plugin checker for comparison with constants instead of named constants or enums. You can use it with --load-plugins=pylint.extensions.magic_value. Closes #7281
Add redundant-typehint-argument message for typing plugin for duplicate assign typehints. Enable the plugin to enable the message with: --load-plugins=pylint.extensions.typing. Closes #7636

False Positives Fixed

Fix false positive for unused-variable and unused-import when a name is only used in a string literal type annotation. Closes #3299
Document a known false positive for useless-suppression when disabling line-too-long in a module with only comments and no code. Closes #3368
trailing-whitespaces is no longer reported within strings. Closes #3822
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 use-maxsplit-arg with custom split method. Closes #4857
Fix logging-fstring-interpolation false positive raised when logging and f-string with %s formatting. Closes #4984
Fix false-positive for used-before-assignment in pattern matching with a guard. Closes #5327
Fix use-sequence-for-iteration when unpacking a set with *. Closes #5788
Fix deprecated-method false positive when alias for method is similar to name of deprecated method. Closes #5886
Fix false positive assigning-non-slot when a class attribute is re-assigned. Closes #6001
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
Fixes false positive abstract-method on Protocol classes. Closes #7209
Pylint now understands the kw_only keyword argument for dataclass. Closes #7290, closes #6550, closes #5857
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
Fix used-before-assignment for functions/classes defined in type checking guard. Closes #7368
Fix false positive for unhashable-member when subclassing dict and using the subclass as a dictionary key. Closes #7501
Fix the message for unnecessary-dunder-call for __aiter__ and __aneext__. Also only emit the warning when py-version >= 3.10. Closes #7529
Fix used-before-assignment false positive when else branch calls sys.exit or similar terminating functions. Closes #7563
Fix a false positive for used-before-assignment for imports guarded by typing.TYPE_CHECKING later used in variable annotations. Closes #7609
Fix a false positive for simplify-boolean-expression when multiple values are inferred for a constant. Closes #7626
unnecessary-list-index-lookup will not be wrongly emitted if enumerate is called with start. Closes #7682
Don't warn about stop-iteration-return when using next() over itertools.cycle. Closes #7765
Fixes used-before-assignment false positive when the walrus operator is used in a ternary operator. Closes #7779
Fix missing-param-doc false positive when function parameter has an escaped underscore. Closes #7827
Fixes method-cache-max-size-none false positive for methods inheriting from Enum. Closes #7857
multiple-statements no longer triggers for function stubs using inlined .... Closes #7860
Fix a false positive for used-before-assignment when a name guarded by if TYPE_CHECKING: is used as a type annotation in a function body and later re-imported in the same scope. Closes #7882
Prevent used-before-assignment when imports guarded by if TYPE_CHECKING are guarded again when used. Closes #7979
Fixes false positive for try-except-raise with multiple exceptions in one except statement if exception are in different namespace. Closes #8051
Fix invalid-name errors for typing_extension.TypeVar. Refs #8089
Fix no-kwoa false positive for context managers. Closes #8100
Fix a false positive for redefined-variable-type when async methods are present. Closes #8120

False Negatives Fixed

Code following a call to quit, exit, sys.exit or os._exit will be marked as unreachable. Refs #519
Emit used-before-assignment when function arguments are redefined inside an inner function and accessed there before assignment. Closes #2374
Fix a false negative for unused-import when one module used an import in a type annotation that was also used in another module. Closes #4150
Flag superfluous-parens if parentheses are used during string concatenation. Closes #4792
Emit used-before-assignment when relying on names only defined under conditions always testing false. Closes #4913
consider-using-join can now be emitted for non-empty string separators. Closes #6639
Emit used-before-assignment for further imports guarded by TYPE_CHECKING Previously, this message was only emitted for imports guarded directly under TYPE_CHECKING, not guarded two if-branches deep, nor when TYPE_CHECKING was imported from typing under an alias. Closes #7539
Fix a false negative for unused-import when a constant inside typing.Annotated was treated as a reference to an import. Closes #7547
consider-using-any-or-all message will now be raised in cases when boolean is initialized, reassigned during loop, and immediately returned. Closes #7699
Extend invalid-slice-index to emit an warning for invalid slice indices used with string and byte sequences, and range objects. Refs #7762
Fixes unnecessary-list-index-lookup false negative when enumerate is called with iterable as a kwarg. Closes #7770
no-else-return or no-else-raise will be emitted if except block always returns or raises. Closes #7788
Fix dangerous-default-value false negative when * is used. Closes #7818
consider-using-with now triggers for pathlib.Path.open. Closes #7964

Other Bug Fixes

Fix bug in detecting unused-variable when iterating on variable. Closes #3044
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
Update disallowed-name check to flag module-level variables. Closes #3701
Pylint will no longer deadlock if a parallel job is killed but fail immediately instead. Closes #3899
Fix ignored files being linted when passed on stdin. Closes #4354
Fix no-member false negative when augmented assign is done manually, without +=. Closes #4562
Any assertion on a populated tuple will now receive a assert-on-tuple warning. Closes #4655
missing-return-doc, missing-raises-doc and missing-yields-doc now respect the no-docstring-rgx option. Closes #4743
Update reimported help message for clarity. Closes #4836
consider-iterating-dictionary will no longer be raised if bitwise operations are used. Closes #5478
Using custom braces in msg-template will now work properly. Closes #5636
Pylint will now filter duplicates given to it before linting. The output should be the same whether a file is given/discovered multiple times or not. Closes #6242, #4053
Remove __index__ dunder method call from unnecessary-dunder-call check. Closes #6795
Fixed handling of -- as separator between positional arguments and flags. This was not actually fixed in 2.14.5. Closes #7003, Refs #7096
Don't crash on OSError in config file discovery. Closes #7169
Messages sent to reporter are now copied so a reporter cannot modify the message sent to other reporters. Closes #7214
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.
Update modified_iterating checker to fix a crash with for loops on empty list. Closes #7380
Update wording for arguments-differ and arguments-renamed to clarify overriding object. Closes #7390
disable-next is now correctly scoped to only the succeeding line. Closes #7401
Fixed a crash in the unhashable-member checker when using a lambda as a dict key. Closes #7453
Add mailcap to deprecated modules list. Closes #7457
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
--help-msg now accepts a comma-separated list of message IDs again. Closes #7471
Allow specifying non-builtin exceptions in the overgeneral-exception option using an exception's qualified name. Closes #7495
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
Use py-version to determine if a message should be emitted for messages defined with max-version or min-version. Closes #7569
Improve bad-thread-instantiation check to warn if target is not passed in as a keyword argument or as a second argument. Closes #7570
Fixes edge case of custom method named next raised an astroid error. Closes #7610
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.
Fix crash that happened when parsing files with unexpected encoding starting with 'utf' like utf13. Closes #7661
Fix a crash when a child class with an __init__ method inherits from a parent class with an __init__ class attribute. Closes #7742
Fix valid-metaclass-classmethod-first-arg default config value from "cls" to "mcs" which would cause both a false-positive and false-negative. Closes #7782
Fixes a crash in the unnecessary_list_index_lookup check when using enumerate with start and a class attribute. Closes #7821
Fixes a crash in stop-iteration-return when the next builtin is called without arguments. Closes #7828
When pylint exit due to bad arguments being provided the exit code will now be the expected 32. Refs #7931
Fixes a ModuleNotFound exception when running pylint on a Django project with the pylint_django plugin enabled. Closes #7938
Fixed a crash when inferring a value and using its qname on a slice that was being incorrectly called. Closes #8067
Use better regex to check for private attributes. Refs #8081
Fix issue with new typing Union syntax in runtime context for Python 3.10+. Closes #8119

Other Changes

Pylint now provides basic support for Python 3.11. Closes #5920
Update message for abstract-method to include child class name. Closes #7124
Update Pyreverse's dot and plantuml printers to detect when class methods are abstract and show them with italic font. For the dot printer update the label to use html-like syntax. Closes #7346
The docparams extension now considers typing in Numpy style docstrings as "documentation" for the missing-param-doc message. Refs #7398
Relevant DeprecationWarnings are now raised with stacklevel=2, so they have the callsite attached in the message. Closes #7463
Add a minimal option to pylint-config and its toml generator. Closes #7485
Add method name to the error messages of no-method-argument and no-self-argument. Closes #7507
Prevent leaving the pip install cache in the Docker image. Refs #7544
Add a keyword-only compare_constants argument to safe_infer. Refs #7626
Add default_enabled option to optional message dict. Provides an option to disable a checker message by default. To use a disabled message, the user must enable it explicitly by adding the message to the enable option. Refs #7629
Sort --generated-rcfile output. Refs #7655
epylint is now deprecated and will be removed in pylint 3.0.0. All emacs and flymake related files were removed and their support will now happen in an external repository : https://github.com/emacsorphanage/pylint. Closes #7737
Adds test for existing preferred-modules configuration functionality. Refs #7957

Internal Changes

Add and fix regression tests for plugin loading. This shores up the tests that cover the loading of custom plugins as affected by any changes made to the sys.path during execution of an init-hook. Given the existing contract of allowing plugins to be loaded by fiddling with the path in this way, this is now the last bit of work needed to close Github issue #7264. Closes #7264

`v2.15.10`

Compare Source

False Positives Fixed

Fix use-sequence-for-iteration when unpacking a set with *.

Closes #5788
Fix false positive assigning-non-slot when a class attribute is re-assigned.

Closes #6001
Fixes used-before-assignment false positive when the walrus operator is used in a ternary operator.

Closes #7779
Prevent used-before-assignment when imports guarded by if TYPE_CHECKING are guarded again when used.

Closes #7979

Other Bug Fixes

Using custom braces in msg-template will now work properly.

Closes #5636

`v2.15.9`

Compare Source

False Positives Fixed

Fix false-positive for used-before-assignment in pattern matching with a guard.

Closes #5327

Other Bug Fixes

Pylint will no longer deadlock if a parallel job is killed but fail immediately instead.

Closes #3899
When pylint exit due to bad arguments being provided the exit code will now be the expected 32.

Refs #7931
Fixes a ModuleNotFound exception when running pylint on a Django project with the pylint_django plugin enabled.

Closes #7938

`v2.15.8`

Compare Source

False Positives Fixed

Document a known false positive for useless-suppression when disabling line-too-long in a module with only comments and no code.

Closes #3368
Fix logging-fstring-interpolation false positive raised when logging and f-string with %s formatting.

Closes #4984
Fixes false positive abstract-method on Protocol classes.

Closes #7209
Fix missing-param-doc false positive when function parameter has an escaped underscore.

Closes #7827
multiple-statements no longer triggers for function stubs using inlined ....

Closes #7860

`v2.15.7`

Compare Source

False Positives Fixed

Fix deprecated-method false positive when alias for method is similar to name of deprecated method.

Closes #5886
Fix a false positive for used-before-assignment for imports guarded by typing.TYPE_CHECKING later used in variable annotations.

Closes #7609

Other Bug Fixes

Pylint will now filter duplicates given to it before linting. The output should be the same whether a file is given/discovered multiple times or not.

Closes #6242, #4053
Fixes a crash in stop-iteration-return when the next builtin is called without arguments.

Closes #7828

`v2.15.6`

Compare Source

False Positives Fixed

Fix false positive for unhashable-member when subclassing dict and using the subclass as a dictionary key.

Closes #7501
unnecessary-list-index-lookup will not be wrongly emitted if enumerate is called with start.

Closes #7682
Don't warn about stop-iteration-return when using next() over itertools.cycle.

Closes #7765

Other Bug Fixes

Messages sent to reporter are now copied so a reporter cannot modify the message sent to other reporters.

Closes #7214
Fixes edge case of custom method named next raised an astroid error.

Closes #7610
Fix crash that happened when parsing files with unexpected encoding starting with 'utf' like utf13.

Closes #7661
Fix a crash when a child class with an __init__ method inherits from a parent class with an __init__ class attribute.

Closes #7742

`v2.15.5`

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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`

Compare Source

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`

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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`

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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

`v2.15.0`

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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 PyCQA#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`

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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`

Compare Source

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`

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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`

Compare Source

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

`v2.14.1`

Compare Source

Avoid reporting unnecessary-dict-index-lookup or unnecessary-list-index-lookup when the index lookup is part of a destructuring assignment.

Closes #6788
Fixed parsing of unrelated options in tox.ini.

Closes #6800
Fixed a crash when linting __new__() methods that return a call expression.

Closes #6805
Don't crash if we can't find the user's home directory.

Closes #6802
Fixed false positives for unused-import when aliasing typing e.g. as t and guarding imports under t.TYPE_CHECKING.

Closes #3846
Fixed a false positive regression in 2.13 for used-before-assignment where it is safe to rely on a name defined only in an except block because the else block returned.

Closes #6790
Fixed the use of abbreviations for some special options on the command line.

Closes #6810
Fix a crash in the optional pylint.extensions.private_import extension.

Closes #6624
bad-option-value (E0012) is now a warning unknown-option-value (W0012). Deleted messages that do not exist anymore in pylint now raise useless-option-value (R0022) instead of bad-option-value. This allows to distinguish between genuine typos and configuration that could be cleaned up. Existing message disables for bad-option-value will still work on both new messages.

Refs #6794

`v2.14.0`

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Summary -- Release highlights

With 2.14 pylint only supports Python version 3.7.2 and above.

We introduced several new checks among which duplicate-value for sets, comparison-of-constants, and checks related to lambdas. We removed no-init and made no-self-use optional as they were too opinionated. We also added an option to generate a toml configuration: --generate-toml-config.

We migrated to argparse from optparse and refactored the configuration handling thanks to Daniël van Noord. On the user side it should change the output of the --help command, and some inconsistencies and bugs should disappear. The behavior between options set in a config file versus on the command line will be more consistent. For us, it will permit to maintain this part of the code easily in the future and anticipate optparse's removal in Python 3.12.

As a result of the refactor there are a lot of internal deprecations. If you're a library maintainer that depends on pylint, please verify that you're ready for pylint 3.0 by activating deprecation warnings.

We continued the integration of pylint-error and are now at 33%!. We still welcome any community effort to help review, integrate, and add good/bad examples in #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!

New checkers

Added new checker comparison-of-constants.

Closes #6076
Added new checker typevar-name-mismatch: TypeVar must be assigned to a variable with the same name as its name argument.

Closes #5224
invalid-enum-extension: Used when a class tries to extend an inherited Enum class.

Closes #5501
Added new checker typevar-double-variance: The "covariant" and "contravariant" keyword arguments cannot both be set to "True" in a TypeVar.

Closes #5895
Add new check unnecessary-dunder-call for unnecessary dunder method calls.

Closes #5936
unnecessary-lambda-assignment: Lambda expression assigned to a variable. Define a function using the "def" keyword instead. unnecessary-direct-lambda-call: Lambda expression called directly. Execute the expression inline instead.

Closes #5976
potential-index-error: Emitted when the index of a list or tuple exceeds its length. This checker is currently quite conservative to avoid false positives. We welcome suggestions for improvements.

Closes #578
Added new checker unnecessary-list-index-lookup for indexing into a list while iterating over enumerate().

Closes #4525
Added new message called duplicate-value which identifies duplicate values inside sets.

Closes #5880
Added the super-without-brackets checker, raised when a super call is missing its brackets.

Closes #4008

Removed checkers

The no-init (W0232) warning has been removed. It's ok to not have an __init__ in a class.

Closes #2409
Removed the assign-to-new-keyword message as there are no new keywords in the supported Python versions any longer.

Closes #4683
Moved no-self-use check to optional extension. You now need to explicitly enable this check using load-plugins=pylint.extensions.no_self_use.

Closes #5502

Extensions

RedefinedLoopNameChecker
- Added optional extension redefined-loop-name to emit messages when a loop variable is redefined in the loop body.
Closes #5072
DocStringStyleChecker
- Re-enable checker bad-docstring-quotes for Python <= 3.7.
Closes #6087
NoSelfUseChecker
- Added no-self-use check, previously enabled by default.
Closes #5502

Other Changes

Started ignoring underscore as a local variable for too-many-locals.

Closes #6488
Pylint can now be installed with an extra-require called spelling (pip install pylint[spelling]). This will add pyenchant to pylint's dependencies. You will still need to install the requirements for pyenchant (the enchant library and any dictionaries) yourself. You will also need to set the spelling-dict option.

Refs #6462
Improved wording of the message of deprecated-module

Closes #6169
Pylint now requires Python 3.7.2 or newer to run.

Closes #4301
We made a greater effort to reraise failures stemming from the astroid library as AstroidError, with the effect that pylint emits astroid-error rather than merely fatal. Regardless, please report any such issues you encounter!
We have improved our recognition of inline disable and enable comments. It is now possible to disable bad-option-value inline (as long as you disable it before the bad option value is raised, i.e. disable=bad-option-value,bad-message not disable=bad-message,bad-option-value ) as well as certain other previously unsupported messages.

Closes #3312
The main checker name is now main instead of master. The configuration does not need to be updated as sections' name are optional.

Closes #5467
Update invalid-slots-object message to show bad object rather than its inferred value.

Closes #6101
Fixed a crash in the not-an-iterable checker involving multiple starred expressions inside a call.

Closes #6372
Fixed a crash in the unused-private-member checker involving chained private attributes.

Closes #6709
Disable spellchecking of mypy rule names in ignore directives.

Closes #5929
implicit-str-concat will now be raised on calls like open("myfile.txt" "a+b") too.

Closes #6441
Fix a failure to respect inline disables for fixme occurring on the last line of a module when pylint is launched with --enable=fixme.
Removed the broken generate-man option.

Closes #5283 Closes #1887
Fixed failure to enable deprecated-module after a disable=all by making ImportsChecker solely responsible for emitting deprecated-module instead of sharing responsibility with StdlibChecker. (This could have led to double messages.)
Added the generate-toml-config option.

Refs #5462
bad-option-value will be emitted whenever a configuration value or command line invocation includes an unknown message.

Closes #4324
Added the unrecognized-option message. Raised if we encounter any unrecognized options.

Closes #5259
Fix false negative for bad-string-format-type if the value to be formatted is passed in as a variable holding a constant.
The concept of checker priority has been removed.
The cache-max-size-none checker has been renamed to method-cache-max-size-none.

Closes #5670
The method-cache-max-size-none checker will now also check functools.cache.

Closes #5670
BaseChecker classes now require the linter argument to be passed.
The set_config_directly decorator has been removed.
Don't report useless-super-delegation for the __hash__ method in classes that also override the __eq__ method.

Closes #3934
Fix falsely issuing useless-suppression on the wrong-import-position checker.

Closes #5219
Fixed false positive no-member for Enums with self-defined members.

Closes #5138
Fix false negative for no-member when attempting to assign an instance attribute to itself without any prior assignment.

Closes #1555
Changed message type from redefined-outer-name to redefined-loop-name (optional extension) for redefinitions of outer loop variables by inner loops.

Closes #5608
By default the similarity checker will now ignore imports and ignore function signatures when computing duplication. If you want to keep the previous behaviour set ignore-imports and ignore-signatures to False.
Pylint now expands the user path (i.e. ~ to home/yusef/) and expands environment variables (i.e. home/$USER/$project to home/yusef/pylint for USER=yusef and project=pylint) for pyreverse's output-directory, import-graph, ext-import-graph, int-import-graph options, and the spell checker's spelling-private-dict-file option.

Refs #6493
Don't emit unsubscriptable-object for string annotations. Pylint doesn't check if class is only generic in type stubs only.

Closes #4369 and #6523
Fix pyreverse crash RuntimeError: dictionary changed size during iteration

Refs #6612
Fix syntax for return type annotations in MermaidJS diagrams produced with pyreverse.

Closes #6467
Fix type annotations of class and instance attributes using the alternative union syntax in pyreverse diagrams.
Fix bug where it writes a plain text error message to stdout, invalidating output formats.

Closes #6597
The refactoring checker now also raises 'consider-using-a-generator' messages for max(), min() and sum().

Refs #6595
Update ranges for using-constant-test and missing-parentheses-for-call-in-test error messages.
Don't emit no-member inside type annotations with from __future__ import annotations.

Closes #6594
Fix unexpected-special-method-signature false positive for __init_subclass__ methods with one or more arguments.

Closes #6644

Deprecations

The ignore-mixin-members option has been deprecated. You should now use the new ignored-checks-for-mixins option.

Closes #5205
interfaces.implements has been deprecated and will be removed in 3.0. Please use standard inheritance patterns instead of __implements__.

Refs #2287
All Interface classes in pylint.interfaces have been deprecated. You can subclass the respective normal classes to get the same behaviour. The __implements__ functionality was based on a rejected PEP from 2001: https://peps.python.org/pep-0245/

Closes #2287
MapReduceMixin has been deprecated. BaseChecker now implements get_map_data and reduce_map_data. If a checker actually needs to reduce data it should define get_map_data as returning something different than None and let its reduce_map_data handle a list of the types returned by get_map_data. An example can be seen by looking at pylint/checkers/similar.py.
The config attribute of BaseChecker has been deprecated. You can use checker.linter.config to access the global configuration object instead of a checker-specific object.

Refs #5392
The level attribute of BaseChecker has been deprecated: everything is now displayed in --help, all the time.

Refs #5392
The set_option method of BaseChecker has been deprecated. You can use checker.linter.set_option to set an option on the global configuration object instead of a checker-specific object.

Refs #5392
The options_providers attribute of ArgumentsManager has been deprecated.

Refs #5392
Fix saving of persistent data files in environments where the user's cache directory and the linted file are on a different drive.

Closes #6394
The method-cache-max-size-none checker will now also check functools.cache.
The config attribute of PyLinter is now of the argparse.Namespace type instead of optparse.Values.

Refs #5392
UnsupportedAction has been deprecated.

Refs #5392
OptionsManagerMixIn has been deprecated.

Refs #5392
OptionParser has been deprecated.

Refs #5392
Option has been deprecated.

Refs #5392
OptionsProviderMixIn has been deprecated.

Refs #5392
ConfigurationMixIn has been deprecated.
The option_groups attribute of PyLinter has been deprecated.

Refs #5392
get_global_config has been deprecated. You can now access all global options from checker.linter.config.

Refs #5392
OptionsManagerMixIn has been replaced with ArgumentsManager. ArgumentsManager is considered private API and most methods that were public on OptionsManagerMixIn have now been deprecated and will be removed in a future release.

Refs #5392
OptionsProviderMixIn has been replaced with ArgumentsProvider. ArgumentsProvider is considered private API and most methods that were public on OptionsProviderMixIn have now been deprecated and will be removed in a future release.

Refs #5392
pylint.pyreverse.ASTWalker has been removed, as it was only used internally by a single child class.

Refs #6712
pyreverse: Resolving and displaying implemented interfaces that are defined by the __implements__ attribute has been deprecated and will be removed in 3.0.

Refs #6713
is_class_subscriptable_pep585_with_postponed_evaluation_enabled has been deprecated. Use is_postponed_evaluation_enabled(node) and is_node_in_type_annotation_context(node) instead.

Refs #6536

`v2.13.9`

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2.13.9 is the last release supporting python interpreter between 3.6.2 and 3.7.2.

Respect ignore configuration options with --recursive=y.

Closes #6471
Fix false positives for no-name-in-module and import-error for numpy.distutils and pydantic.

Closes #6497
Fix IndexError crash in uninferable_final_decorators method.

Relates to #6531
Fix a crash in unnecessary-dict-index-lookup when subscripting an attribute.

Closes #6557
Fix a crash when accessing __code__ and assigning it to a variable.

Closes #6539
Fix a false positive for undefined-loop-variable when using enumerate().

Closes #6593

`v2.13.8`

Compare Source

Fix a false positive for undefined-loop-variable for a variable used in a lambda inside the first of multiple loops.

Closes #6419
Fix a crash when linting a file that passes an integer mode= to open

Closes #6414
Avoid reporting superfluous-parens on expressions using the is not operator.

Closes #5930
Fix a false positive for undefined-loop-variable when the else of a for loop raises or returns.

Closes #5971
Fix false positive for unused-variable for classes inside functions and where a metaclass is provided via a call.

Closes #4020
Fix false positive for unsubscriptable-object in Python 3.8 and below for statements guarded by if TYPE_CHECKING.

Closes #3979

`v2.13.7`

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Fix a crash caused by using the new config from 2.14.0 in 2.13.x code.

Closes #6408

`v2.13.6`

Compare Source

Fix a crash in the unsupported-membership-test checker when assigning multiple constants to class attributes including __iter__ via unpacking.

Closes #6366
Asterisks are no longer required in Sphinx and Google style parameter documentation for missing-param-doc and are parsed correctly.

Closes #5815 Closes #5406
Fixed a false positive for unused-variable when a builtin specified in --additional-builtins is given a type annotation.

Closes #6388
Fixed an AstroidError in 2.13.0 raised by the duplicate-code checker with ignore-imports or ignore-signatures enabled.

Closes #6301

`v2.13.5`

Compare Source

Fix false positive regression in 2.13.0 for used-before-assignment for homonyms between variable assignments in try/except blocks and variables in subscripts in comprehensions.

Closes #6069 Closes #6136
lru-cache-decorating-method has been renamed to cache-max-size-none and will only be emitted when maxsize is None.

Closes #6180
Fix false positive for unused-import when disabling both used-before-assignment and undefined-variable.

Closes #6089
Narrow the scope of the unnecessary-ellipsis checker to:
- functions & classes which contain both a docstring and an ellipsis.
- A body which contains an ellipsis nodes.Expr node & at least one other statement.
Fix false positive for used-before-assignment for assignments taking place via nonlocal declarations after an earlier type annotation.

Closes #5394
Fix crash for redefined-slots-in-subclass when the type of the slot is not a const or a string.

Closes #6100
Only raise not-callable when all the inferred values of a property are not callable.

Closes #5931
Fix a false negative for subclassed-final-class when a set of other messages were disabled.

`v2.13.4`

Compare Source

Fix false positive regression in 2.13.0 for used-before-assignment for homonyms between variable assignments in try/except blocks and variables in a comprehension's filter.

Closes #6035
Include testing_pylintrc in source and wheel distributions.

Closes #6028
Fix crash in super-init-not-called checker when using ctypes.Union.

Closes #6027
Fix crash for unneccessary-ellipsis checker when an ellipsis is used inside of a container or a lambda expression.

Closes #6036 Closes #6037 Closes #6048

`v2.13.3`

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Fix false positive for unnecessary-ellipsis when using an ellipsis as a default argument.

Closes #5973
Fix crash involving unbalanced tuple unpacking.

Closes #5998
Fix false positive for 'nonexistent-operator' when repeated '-' are separated (e.g. by parens).

Closes #5769

`v2.13.2`

Compare Source

Fix crash when subclassing a namedtuple.

Closes #5982
Fix false positive for superfluous-parens for patterns like "return (a or b) in iterable".

Closes #5803
Fix a false negative regression in 2.13.0 where protected-access was not raised on functions.

Fixes #5989
Better error messages in case of crash if pylint can't write the issue template.

Refer to #5987

`v2.13.1`

Compare Source

Fix a regression in 2.13.0 where used-before-assignment was emitted for the usage of a nonlocal in a try block.

Fixes #5965
Avoid emitting raising-bad-type when there is inference ambiguity on the variable being raised.

Closes #2793
Loosen TypeVar default name pattern a bit to allow names with multiple uppercase characters. E.g. HVACModeT or IPAddressT.

Closes #5981
Fixed false positive for unused-argument when a nonlocal name is used in a nested function that is returned without being called by its parent.

Closes #5187
Fix program crash for modified_iterating-list/set/dict when the list/dict/set being iterated through is a function call.

Closes #5969
Don't emit broken-noreturn and broken-collections-callable errors inside if TYPE_CHECKING blocks.

`v2.13.0`: 2.13.0

Compare Source

Add missing dunder methods to unexpected-special-method-signature check.
No longer emit no-member in for loops that reference self if the binary operation that started the for loop uses a self that is encapsulated in tuples or lists.

Ref PyCQA/astroid#1360 Closes #4826
Output better error message if unsupported file formats are used with pyreverse.

Closes #5950
Fix pyreverse diagrams type hinting for classmethods and staticmethods.
Fix pyreverse diagrams type hinting for methods returning None.
Fix matching --notes options that end in a non-word character.

Closes #5840
Updated the position of messages for class and function defintions to no longer cover the complete definition. Only the def or class + the name of the class/function are covered.

Closes #5466
using-f-string-in-unsupported-version and using-final-decorator-in-unsupported-version msgids were renamed from W1601 and W1602 to W2601 and W2602. Disabling using these msgids will break. This is done in order to restore consistency with the already existing msgids for apply-builtin and basestring-builtin from the now deleted python 3K+ checker. There is now a check that we're not using existing msgids or symbols from deleted checkers.

Closes #5729
The line numbering for messages related to function arguments is now more accurate. This can require some message disables to be relocated to updated positions.
Add --recursive option to allow recursive discovery of all modules and packages in subtree. Running pylint with --recursive=y option will check all discovered .py files and packages found inside subtree of directory provided as parameter to pylint.

Closes #352
Add modified-iterating-list, modified-iterating-dict and modified-iterating-set, emitted when items are added to or removed from respectively a list, dictionary or set being iterated through.

Closes #5348
Fix false-negative for assignment-from-none checker using list.sort() method.

closes #5722
New extension import-private-name: indicate imports of external private packages and objects (prefixed with _). It can be loaded using load-plugins=pylint.extensions.private_import.

Closes #5463
Fixed crash from arguments-differ and arguments-renamed when methods were defined outside the top level of a class.

Closes #5648
Removed the deprecated check_docs extension. You can use the docparams checker to get the checks previously included in check_docs.

Closes #5322
Added a testutil extra require to the packaging, as gitpython should not be a dependency all the time but is still required to use the primer helper code in pylint.testutil. You can install it with pip install pylint[testutil].

Closes #5486
Reinstated checks from the python3 checker that are still useful for python 3 (eq-without-hash). This is now in the pylint.extensions.eq_without_hash optional extension.

Closes #5025
Fixed an issue where ungrouped-imports could not be disabled without raising useless-suppression.

Ref #2366
Added several checkers to deal with unicode security issues (see Trojan Sources <https://trojansource.codes/>_ and PEP 672 <https://www.python.org/dev/peps/pep-0672/>_ for details) that also concern the readability of the code. In detail the following checks were added:
- bad-file-encoding checks that the file is encoded in UTF-8 as suggested by PEP8 <https://www.python.org/dev/peps/pep-0008/#id20>. UTF-16 and UTF-32 are not supported by Python <https://bugs.python.org/issue1503789> at the moment. If this ever changes invalid-unicode-codec checks that they aren't used, to allow for backwards compatibility.
- bidirectional-unicode checks for bidirectional unicode characters that could make code execution different than what the user expects.
- invalid-character-backspace, invalid-character-carriage-return, invalid-character-sub, invalid-character-esc, invalid-character-zero-width-space and invalid-character-nul to check for possibly harmful unescaped characters.
Closes #5281
Use the tomli package instead of toml to parse .toml files.

Closes #5885

Fix false positive - Allow unpacking of self in a subclass of typing.NamedTuple.

Closes #5312

Fixed false negative unpacking-non-sequence when value is an empty list.

Closes #5707

Better warning messages for useless else or elif when a function returns early.

Closes #5614
Fixed false positive consider-using-dict-comprehension when creating a dict using a list of tuples where key AND value vary depending on the same condition.

Closes #5588
Fixed false positive for global-variable-undefined when global is used with a class name

Closes #3088
Fixed false positive for unused-variable when a nonlocal name is assigned as part of a multi-name assignment.

Closes #3781
Fixed a crash in unspecified-encoding checker when providing None to the mode argument of an open() call.

Closes #5731
Fixed a crash involving a NewType named with an f-string.

Closes #5770 Ref PyCQA/astroid#1400
Improved bad-open-mode message when providing None to the mode argument of an open() call.

Closes #5733
Added lru-cache-decorating-method checker with checks for the use of functools.lru_cache on class methods. This is unrecommended as it creates memory leaks by never letting the instance getting garbage collected.

Closes #5670
Fixed crash with recursion error for inference of class attributes that referenced the class itself.

Closes #5408 Ref PyCQA/astroid#1392
Fixed false positive for unused-argument when a method overridden in a subclass does nothing with the value of a keyword-only argument.

Closes #5771 Ref PyCQA/astroid#1382
The issue template for crashes is now created for crashes which were previously not covered by this mechanism.

Closes #5668
Rewrote checker for non-ascii-name. It now ensures all Python names are ASCII and also properly checks the names of imports (non-ascii-module-import) as well as file names (non-ascii-file-name) and emits their respective new warnings.

Non ASCII characters could be homoglyphs (look alike characters) and hard to enter on a non specialized keyboard. See Confusable Characters in PEP 672 <https://www.python.org/dev/peps/pep-0672/#confusable-characters-in-identifiers>_
When run in parallel mode pylint now pickles the data passed to subprocesses with the dill package. The dill package has therefore been added as a dependency.
An astroid issue where symlinks were not being taken into account was fixed

Closes #1470 Closes #3499 Closes #4302 Closes #4798 Closes #5081
Fix a crash in unused-private-member checker when analyzing code using type(self) in bound methods.

Closes #5569
Optimize parsing of long lines when missing-final-newline is enabled.

Closes #5724
Fix false positives for used-before-assignment from using named expressions in a ternary operator test and using that expression as a call argument.

Closes #5177, #5212
Fix false positive for undefined-variable when namedtuple class attributes are used as return annotations.

Closes #5568
Fix false negative for undefined-variable and related variable messages when the same undefined variable is used as a type annotation and is accessed multiple times, or is used as a default argument to a function.

Closes #5399
Pyreverse - add output in mermaidjs format
Emit used-before-assignment instead of undefined-variable when attempting to access unused type annotations.

Closes #5713
Added confidence level CONTROL_FLOW for warnings relying on assumptions about control flow.
used-before-assignment now considers that assignments in a try block may not have occurred when the except or finally blocks are executed.

Closes #85, #2615
Fixed false negative for used-before-assignment when a conditional or context manager intervened before the try statement that suggested it might fail.

Closes #4045
Fixed false negative for used-before-assignment in finally blocks if an except handler did not define the assignment that might have failed in the try block.
Fixed extremely long processing of long lines with comma's.

Closes #5483
Fixed crash on properties and inherited class methods when comparing them for equality against an empty dict.

Closes #5646
Fixed a false positive for assigning-non-slot when the slotted class defined __setattr__.

Closes #3793
Fixed a false positive for invalid-class-object when the object being assigned to the __class__ attribute is uninferable.
Fixed false positive for used-before-assignment with self-referential type annotation in conditional statements within class methods.

Closes #5499
Add checker redefined-slots-in-subclass: Emitted when a slot is redefined in a subclass.

Closes #5617
Fixed false positive for global-variable-not-assigned when the del statement is used

Closes #5333
By default, pylint does no longer take files starting with .# into account. Those are considered emacs file locks. See https://www.gnu.org/software/emacs/manual/html_node/elisp/File-Locks.html. This behavior can be reverted by redefining the ignore-patterns option.

Closes #367
Fixed a false positive for used-before-assignment when a named expression appears as the first value in a container.

Closes #5112
used-before-assignment now assumes that assignments in except blocks may not have occurred and warns accordingly.

Closes #4761
When evaluating statements after an except block, used-before-assignment assumes that assignments in the except blocks took place if the corresponding try block contained a return statement.

Closes #5500
Fixed a false negative for used-before-assignment when some but not all except handlers defined a name relied upon after an except block when the corresponding try block contained a return statement.

Closes #5524
When evaluating statements in the else clause of a loop, used-before-assignment assumes that assignments in the except blocks took place if the except handlers constituted the only ways for the loop to finish without breaking early.

Closes #5683
used-before-assignment now checks names in try blocks.
Fixed false positive with used-before-assignment for assignment expressions in lambda statements.

Closes #5360, #3877
Fixed a false positive (affecting unreleased development) for used-before-assignment involving homonyms between filtered comprehensions and assignments in except blocks.

Closes #5586
Fixed crash with slots assignments and annotated assignments.

Closes #5479
Fixed crash on list comprehensions that used type as inner variable name.

Closes #5461
Fixed crash in use-maxsplit-arg checker when providing the sep argument to str.split() by keyword.

Closes #5737
Fix false positive for unused-variable for a comprehension variable matching an outer scope type annotation.

Closes #5326
Fix false negative for undefined-variable for a variable used multiple times in a comprehension matching an unused outer scope type annotation.

Closes #5654
Some files in pylint.testutils were deprecated. In the future imports should be done from the pylint.testutils.functional namespace directly.
Fixed false positives for no-value-for-parameter with variadic positional arguments.

Closes #5416
safe_infer no longer makes an inference when given two function definitions with differing numbers of arguments.

Closes #3675
Fix comparison-with-callable false positive for callables that raise, such as typing constants.

Closes #5557
Fixed a crash on __init__ nodes when the attribute was previously uninferable due to a cache limit size. This limit can be hit when the inheritance pattern of a class (and therefore of the __init__ attribute) is very large.

Closes #5679
Fix false positive for used-before-assignment from a class definition nested under a function subclassing a class defined outside the function.

Closes #4590
Fix unnecessary_dict_index_lookup false positive when deleting a dictionary's entry.

Closes #4716
Fix false positive for used-before-assignment when an except handler shares a name with a test in a filtered comprehension.

Closes #5817
Fix crash in unnecessary-dict-index-lookup checker if the output of items() is assigned to a 1-tuple.

Closes #5504
When invoking pylint, epylint, symilar or pyreverse by importing them in a python file you can now pass an argv keyword besides patching sys.argv.

Closes #5320
The PyLinter class will now be initialized with a TextReporter as its reporter if none is provided.
Fix super-init-not-called when parent or self is a Protocol

Closes #4790
Fix false positive not-callable with attributes that alias NamedTuple

Partially closes #1730
Emit redefined-outer-name when a nested except handler shadows an outer one.

Closes #4434 Closes #5370
Fix false positive super-init-not-called for classes that inherit their init from a parent.

Closes #4941
encoding can now be supplied as a positional argument to calls that open files without triggering unspecified-encoding.

Closes #5638
Fatal errors now emit a score of 0.0 regardless of whether the linted module contained any statements

Closes #5451
fatal was added to the variables permitted in score evaluation expressions.
The default score evaluation now uses a floor of 0.

Closes #2399
Fix false negative for consider-iterating-dictionary during membership checks encapsulated in iterables or not in checks

Closes #5323
Fixed crash on uninferable decorators on Python 3.6 and 3.7
Add checker unnecessary-ellipsis: Emitted when the ellipsis constant is used unnecessarily.

Closes #5460
Disable checker bad-docstring-quotes for Python <= 3.7, because in these versions the line numbers for decorated functions and classes are not reliable which interferes with the checker.

Closes #3077
Fixed incorrect classification of Numpy-style docstring as Google-style docstring for docstrings with property setter documentation. Docstring classification is now based on the highest amount of matched sections instead of the order in which the docstring styles were tried.
Fixed detection of arguments-differ when superclass static methods lacked a @staticmethod decorator.

Closes #5371
TypingChecker
- Added new check broken-noreturn to detect broken uses of typing.NoReturn if py-version is set to Python 3.7.1 or below. https://bugs.python.org/issue34921
- Added new check broken-collections-callable to detect broken uses of collections.abc.Callable if py-version is set to Python 3.9.1 or below. https://bugs.python.org/issue42965
The testutils for unittests now accept end_lineno and end_column. Tests without these will trigger a DeprecationWarning.
arguments-differ will no longer complain about method redefinitions with extra parameters that have default values.

Closes #1556, #5338
Fixed false positive unexpected-keyword-arg for decorators.

Closes #258
Importing the deprecated stdlib module xml.etree.cElementTree now emits deprecated_module.

Closes #5862
Disables for deprecated-module and similar warnings for stdlib features deprecated in newer versions of Python no longer raise useless-suppression when linting with older Python interpreters where those features are not yet deprecated.
Importing the deprecated stdlib module distutils now emits deprecated_module on Python 3.10+.
missing-raises-doc will now check the class hierarchy of the raised exceptions

.. code-block:: python

def my_function() """My function.
```
Raises:
  Exception: if something fails
"""
raise ValueError
```
Closes #4955
Allow disabling duplicate-code with a disable comment when running through pylint.

Closes #214
Improve invalid-name check for TypeVar names. The accepted pattern can be customized with --typevar-rgx.

Closes #3401
Added new checker typevar-name-missing-variance. Emitted when a covariant or contravariant TypeVar does not end with _co or _contra respectively or when a TypeVar is not either but has a suffix.
Allow usage of mccabe 0.7.x release

Closes #5878
Fix unused-private-member false positive when accessing private methods through property.

Closes #4756

`v2.12.2`

Compare Source

Fixed a false positive for unused-import where everything was not analyzed properly inside typing guards.
Fixed a false-positive regression for used-before-assignment for typed variables in the body of class methods that reference the same class

Closes #5342
Specified that the ignore-paths option considers "" to represent a windows directory delimiter instead of a regular expression escape character.
Fixed a crash with the ignore-paths option when invoking the option via the command line.

Closes #5437
Fixed handling of Sphinx-style parameter docstrings with asterisks. These should be escaped with by prepending a "".

Closes #5406
Add endLine and endColumn keys to output of JSONReporter.

Closes #5380
Fixed handling of Google-style parameter specifications where descriptions are on the line following the parameter name. These were generating false positives for missing-param-doc.

Closes #5452
Fix false negative for consider-iterating-dictionary during membership checks encapsulated in iterables or not in checks

Closes #5323
unused-import now check all ancestors for typing guards

Closes #5316

`v2.12.1`: 2.12.1

Compare Source

Require Python 3.6.2 to run pylint.

Closes #5065

`v2.12.0`: 2.12.0

Compare Source

Upgrade astroid to 2.9.0

Closes #4982
Add ability to add end_line and end_column to the --msg-template option. With the standard TextReporter this will add the line and column number of the end of a node to the output of Pylint. If these numbers are unknown, they are represented by an empty string.
Introduced primer tests and a configuration tests framework. The helper classes available in pylint/testutil/ are still unstable and might be modified in the near future.

Closes #4412 #5287
Fix install graphiz message which isn't needed for puml output format.
MessageTest of the unittest testutil now requires the confidence attribute to match the expected value. If none is provided it is set to UNDEFINED.
add_message of the unittest testutil now actually handles the col_offset parameter and allows it to be checked against actual output in a test.
Fix a crash in the check_elif extensions where an undetected if in a comprehension with an if statement within a f-string resulted in an out of range error. The checker no longer relies on counting if statements anymore and uses known if statements locations instead. It should not crash on badly parsed if statements anymore.
Fix simplify-boolean-expression when condition can be inferred as False.

Closes #5200
Fix exception when pyreverse parses property function of a class.
The functional testutils now accept end_lineno and end_column. Expected output files without these will trigger a DeprecationWarning. Expected output files can be easily updated with the python tests/test_functional.py --update-functional-output command.
The functional testutils now correctly check the distinction betweeen HIGH and UNDEFINED confidence. Expected output files without defiend confidence levels will now trigger a DeprecationWarning. Expected output files can be easily updated with the python tests/test_functional.py --update-functional-output command.
The functional test runner now supports the option min_pyver_end_position to control on which python versions the end_lineno and end_column attributes should be checked. The default value is 3.8.
Fix accept-no-yields-doc and accept-no-return-doc not allowing missing yield or return documentation when a docstring is partially correct

Closes #5223
Add an optional extension consider-using-any-or-all : Emitted when a for loop only produces a boolean and could be replaced by any or all using a generator. Also suggests a suitable any or all statement.

Closes #5008
Properly identify parameters with no documentation and add new message called missing-any-param-doc

Closes #3799
Add checkers overridden-final-method & subclassed-final-class

Closes #3197
Fixed protected-access for accessing of attributes and methods of inner classes

Closes #3066
Added support for ModuleNotFoundError (import-error and no-name-in-module). ModuleNotFoundError inherits from ImportError and was added in Python 3.6
undefined-variable now correctly flags variables which only receive a type annotations and never get assigned a value

Closes #5140
undefined-variable now correctly considers the line numbering and order of classes used in metaclass declarations

Closes #4031
used-before-assignment now correctly considers references to classes as type annotation or default values in first-level methods

Closes #3771
undefined-variable and unused-variable now correctly trigger for assignment expressions in functions defaults

Fixes part of #3688
undefined-variable now correctly triggers for assignment expressions in if ... else statements This includes a basic form of control flow inference for if ... else statements using constant boolean values

Closes #3688
Added the --enable-all-extensions command line option. It will load all available extensions which can be listed by running --list-extensions
Fix bug with importing namespace packages with relative imports

Closes #2967 and #5131
Improve and flatten unused-wildcard-import message

Closes #3859
In length checker, len-as-condition has been renamed as use-implicit-booleaness-not-len in order to be consistent with use-implicit-booleaness-not-comparison.
Created new UnsupportedVersionChecker checker class that includes checks for features not supported by all versions indicated by a py-version.
- Added using-f-string-in-unsupported-version checker. Issued when py-version is set to a version that does not support f-strings (< 3.6)
Fix useless-super-delegation false positive when default keyword argument is a variable.
Properly emit duplicate-key when Enum members are duplicate dictionary keys

Closes #5150
Use py-version setting for alternative union syntax check (PEP 604), instead of the Python interpreter version.
Subclasses of dict are regarded as reversible by the bad-reversed-sequence checker (Python 3.8 onwards).

Closes #4981
Support configuring mixin class pattern via mixin-class-rgx
Added new checker use-implicit-booleaness-not-comparison: Emitted when collection literal comparison is being used to check for emptiness.

Closes #4774
mising-param-doc now correctly parses asterisks for variable length and keyword parameters

Closes #3733
mising-param-doc now correctly handles Numpy parameter documentation without explicit typing

Closes #5222
pylint no longer crashes when checking assignment expressions within if-statements

Closes #5178
Update ``literal-comparison``` checker to ignore tuple literals

Closes #3031
Normalize the input to the ignore-paths option to allow both Posix and Windows paths

Closes #5194
Fix double emitting of not-callable on inferrable properties

Closes #4426
self-cls-assignment now also considers tuple assignment
Fix missing-function-docstring not being able to check __init__ and other magic methods even if the no-docstring-rgx setting was set to do so
Added using-final-decorator-in-unsupported-version checker. Issued when py-version is set to a version that does not support typing.final (< 3.8)
Added configuration option exclude-too-few-public-methods to allow excluding classes from the min-public-methods checker.

Closes #3370
The --jobs parameter now fallbacks to 1 if the host operating system does not have functioning shared semaphore implementation.

Closes #5216
Fix crash for unused-private-member when checking private members on __class__

Closes #5261
Crashes when a list is encountered in a toml configuration do not happen anymore.

Closes #4580
Moved misplaced-comparison-constant to its own extension comparison_placement. This checker was opinionated and now no longer a default. It can be reactived by adding pylint.extensions.comparison_placement to load-plugins in your config.

Closes #1064
A new bad-configuration-section checker was added that will emit for misplaced option in pylint's top level namespace for toml configuration. Top-level dictionaries or option defined in the wrong section will still silently not be taken into account, which is tracked in a follow-up issue.

Follow-up in #5259
Fix crash for protected-access on (outer) class traversal
Added new checker useless-with-lock to find incorrect usage of with statement and threading module locks. Emitted when with threading.Lock(): is used instead of with lock_instance:.

Closes #5208
Make yn validator case insensitive, to allow for True and False in config files.
Fix crash on open() calls when the mode argument is not a simple string.

Partially closes #5321
Inheriting from a class that implements __class_getitem__ no longer raises inherit-non-class.
Pyreverse - Add the project root directory to sys.path

Closes #2479
Don't emit consider-using-f-string if py-version is set to Python < 3.6. f-strings were added in Python 3.6

Closes #5019
Fix regression for unspecified-encoding with pathlib.Path.read_text()

Closes #5029
Don't emit consider-using-f-string if the variables to be interpolated include a backslash
Fixed false positive for cell-var-from-loop when variable is used as the default value for a keyword-only parameter.

Closes #5012
Fix false-positive undefined-variable with Lambda, IfExp, and assignment expression.
Fix false-positive useless-suppression for wrong-import-order

Closes #2366
Fixed toml dependency issue

Closes #5066
Fix false-positive useless-suppression for line-too-long

Closes #4212
Fixed invalid-name not checking parameters of overwritten base object methods

Closes #3614
Fixed crash in consider-using-f-string if format is not called

Closes #5058
Fix crash with AssignAttr in if TYPE_CHECKING blocks.

Closes #5111
Improve node information for invalid-name on function argument.
Prevent return type checkers being called on functions with ellipses as body

Closes #4736
Add is_sys_guard and is_typing_guard helper functions from astroid to pylint.checkers.utils.
Fix regression on ClassDef inference

Closes #5030 Closes #5036
Fix regression on Compare node inference

Closes #5048
Fix false-positive isinstance-second-argument-not-valid-type with typing.Callable.

Closes #3507 Closes #5087
It is now recommended to do pylint development on Python 3.8 or higher. This allows using the latest ast parser.
All standard jobs in the pylint CI now run on Python 3.8 by default. We still support python 3.6 and 3.7 and run tests for those interpreters.
TypingChecker
- Fix false-negative for deprecated-typing-alias and consider-using-alias with typing.Type + typing.Callable.

`v2.11.1`

Compare Source

unspecified-encoding now checks the encoding of pathlib.Path() correctly

Closes #5017

`v2.11.0`

Compare Source

The python3 porting mode checker and it's py3k option were removed. You can still find it in older pylint versions.
raising-bad-type is now properly emitted when raising a string
Added new extension SetMembershipChecker with use-set-for-membership check: Emitted when using an in-place defined list or tuple to do a membership test. sets are better optimized for that.

Closes #4776
Added py-version config key (if [MASTER] section). Used for version dependant checks. Will default to whatever Python version pylint is executed with.
CodeStyleChecker
- Added consider-using-assignment-expr: Emitted when an assignment is directly followed by an if statement and both can be combined by using an assignment expression :=. Requires Python 3.8
  
  Closes #4862
Added consider-using-f-string: Emitted when .format() or '%' is being used to format a string.

Closes #3592
Fix false positive for consider-using-with if a context manager is assigned to a variable in different paths of control flow (e. g. if-else clause).

Closes #4751
https is now prefered in the documentation and http://pylint.pycqa.org correctly redirect to https://pylint.pycqa.org

Closes #3802
Fix false positive for function-redefined for simple type annotations

Closes #4936
Fix false positive for protected-access if a protected member is used in type hints of function definitions
Fix false positive dict-iter-missing-items for dictionaries only using tuples as keys

Closes #3282
The unspecified-encoding checker now also checks calls to pathlib.Path().read_text() and pathlib.Path().write_text()

Closes #4945
Fix false positive superfluous-parens for tuples created with inner tuples

Closes #4907
Fix false positive unused-private-member for accessing attributes in a class using cls

Closes #4849
Fix false positive unused-private-member for private staticmethods accessed in classmethods.

Closes #4849
Extended consider-using-in check to work for attribute access.
Setting min-similarity-lines to 0 now makes the similarty checker stop checking for duplicate code

Closes #4901
Fix a bug where pylint complained if the cache's parent directory does not exist

Closes #4900
The global-variable-not-assigned checker now catches global variables that are never reassigned in a local scope and catches (reassigned) functions

Closes #1375 Closes #330
Fix false positives for invalid-all-format that are lists or tuples at runtime

Closes #4711
Fix no-self-use and docparams extension for async functions and methods.
Add documentation for pyreverse and symilar

Closes #4616
Non symbolic messages with the wrong capitalisation now correctly trigger use-symbolic-message-instead

Closes #5000
The consider-iterating-dictionary checker now also considers membership checks

Closes #4069
The invalid-name message is now more detailed when using multiple naming style regexes.

`v2.10.2`

Compare Source

We now use platformdirs instead of appdirs since the latter is not maintained.

Closes #4886
Fix a crash in the checker raising shallow-copy-environ when failing to infer on copy.copy

Closes #4891

`v2.10.1`

Compare Source

pylint does not crash when PYLINT_HOME does not exist.

Closes #4883

`v2.10.0`

Compare Source

pyreverse: add option to produce colored output.

Closes #4488
pyreverse: add output in PlantUML format.

Closes #4498
consider-using-with is no longer triggered if a context manager is returned from a function.

Closes #4748
pylint does not crash with a traceback anymore when a file is problematic. It creates a template text file for opening an issue on the bug tracker instead. The linting can go on for other non problematic files instead of being impossible.
pyreverse: Show class has-a relationships inferred from the type-hint

Closes #4744
Fixed a crash when importing beyond the top level package during import-error message creation

Closes #4775
Added ignored-parents option to the design checker to ignore specific classes from the too-many-ancestors check (R0901).

Partially closes #3057
Added unspecified-encoding: Emitted when open() is called without specifying an encoding

Closes #3826
Improved the Similarity checker performance. Fix issue with --min-similarity-lines used with --jobs.

Close #4120 Close #4118
Don't emit no-member error if guarded behind if statement.

Ref #1162 Closes #1990 Closes #4168
The default for PYLINTHOME is now the standard XDG_CACHE_HOME, and pylint now uses appdirs.

Closes #3878
Added use-list-literal: Emitted when list() is called with no arguments instead of using []

Closes #4365
Added use-dict-literal: Emitted when dict() is called with no arguments instead of using {}

Closes #4365
Added optional extension consider-ternary-expression: Emitted whenever a variable is assigned in both branches of an if/else block.

Closes #4366
Added optional extension while-used: Emitted whenever a while loop is used.

Closes #4367
Added forgotten-debug-statement: Emitted when breakpoint, pdb.set_trace or sys.breakpointhook calls are found

Closes #3692
Fix false-positive of unused-private-member when using nested functions in a class

Closes #4673
Fix crash for unused-private-member that occurred with nested attributes.

Closes #4755
Fix a false positive for unused-private-member with class names

Closes #4681
Fix false positives for superfluous-parens with walrus operator, ternary operator and inside list comprehension.

Closes #2818 Closes #3249 Closes #3608 Closes #4346
Added format-string-without-interpolation checker: Emitted when formatting is applied to a string without any variables to be replaced

Closes #4042
Refactor of --list-msgs & --list-msgs-enabled: both options now show whether messages are emittable with the current interpreter.

Closes #4778
Fix false negative for used-before-assignment when the variable is assigned in an exception handler, but used outside of the handler.

Closes #626
Added disable-next option: allows using # pylint: disable-next=msgid to disable a message for the following line

Closes #1682
Added redundant-u-string-prefix checker: Emitted when the u prefix is added to a string

Closes #4102
Fixed cell-var-from-loop checker: handle cell variables in comprehensions within functions, and function default argument expressions. Also handle basic variable shadowing.

Closes #2846 Closes #3107
Fixed bug with cell-var-from-loop checker: it no longer has false negatives when both unused-variable and used-before-assignment are disabled.
Fix false postive for invalid-all-format if the list or tuple builtin functions are used

Closes #4711
Config files can now contain environment variables

Closes #3839
Fix false-positive used-before-assignment with an assignment expression in a Return node

Closes #4828
Added use-sequence-for-iteration: Emitted when iterating over an in-place defined set.
CodeStyleChecker
- Limit consider-using-tuple to be emitted only for in-place defined lists.
- Emit consider-using-tuple even if list contains a starred expression.
Ignore decorators lines by similarities checker when ignore signatures flag enabled

Closes #4839
Allow true and false values in pylintrc for better compatibility with toml config.
Class methods' signatures are ignored the same way as functions' with similarities "ignore-signatures" option enabled

Closes #4653
Improve performance when inferring Call nodes, by utilizing caching.
Improve error message for invalid-metaclass when the node is an Instance.

`v2.9.6`

Compare Source

Fix a false positive undefined-variable when variable name in decoration matches function argument

Closes #3791

`v2.9.5`

Compare Source

Fix a crash when there would be a 'TypeError object does not support item assignment' in the code we parse.

Closes #4439
Fix crash if a callable returning a context manager was assigned to a list or dict item

Closes #4732
Fix a crash when a AttributeInferenceError was not handled properly when failing to infer the real name of an import in astroid.

Closes #4692

`v2.9.4`

Compare Source

Added time.clock to deprecated functions/methods for python 3.3
Fix bug in which --fail-on can return a zero exit code even when the specified issue is present

Closes #4296 Closes #3363
Fix hard failure when handling missing attribute in a class with duplicated bases

Closes #4687
Fix false-positive consider-using-with (R1732) if a ternary conditional is used together with with

Closes #4676
Fix false-positive deprecated-module when relative import uses deprecated module name.

Closes #4629
Fix false-positive consider-using-with (R1732) if contextlib.ExitStack takes care of calling the __exit__ method

Closes #4654
Fix a false positive for unused-private-member when mutating a private attribute with cls

Closes #4657
Fix ignored empty functions by similarities checker with "ignore-signatures" option enabled

Closes #4652
Fix false-positive of use-maxsplit-arg when index is incremented in a loop

Closes #4664
Don't emit cyclic-import message if import is guarded by typing.TYPE_CHECKING.

Closes #3525
Fix false-positive not-callable with alternative TypedDict syntax

Closes #4715
Clarify documentation for consider-using-from-import
Don't emit unreachable warning for empty generator functions

Closes #4698
Don't emit import-error, no-name-in-module, and ungrouped-imports for imports guarded by sys.version_info or typing.TYPE_CHECKING.

Closes #3285 Closes #3382
Fix invalid-overridden-method with nested property

Closes #4368
Fix false-positive of unused-private-member when using __new__ in a class

Closes #4668
No longer emit consider-using-with for ThreadPoolExecutor and ProcessPoolExecutor as they have legitimate use cases without a with block.

Closes #4689
Fix crash when inferring variables assigned in match patterns

Closes #4685
Fix a crash when a StopIteration was raised when inferring a faulty function in a context manager.

Closes #4723

`v2.9.3`

Compare Source

Fix a crash that happened when analyzing empty function with docstring in the similarity checker.

Closes #4648
The similarity checker no longer add three trailing whitespaces for empty lines in its report.

`v2.9.2`

Compare Source

Fix a crash that happened when analysing code using type(self) to access a class attribute in the unused-private-member checker.

Closes #4638
Fix a false positive for unused-private-member when accessing a private variable with self

Closes #4644
Fix false-positive of unnecessary-dict-index-lookup and consider-using-dict-items for reassigned dict index lookups

Closes #4630

`v2.9.1`

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Upgrade astroid to 2.6.2

Closes #4631 Closes #4633

`v2.9.0`

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Python 3.10 is now supported.
Add type annotations to pyreverse dot files

Closes #1548
Fix missing support for detecting deprecated aliases to existing functions/methods.

Closes #4618
astroid has been upgraded to 2.6.1
Added various deprecated functions/methods for python 3.10, 3.7, 3.6 and 3.3
Fix false positive useless-type-doc on ignored argument using pylint.extensions.docparams when a function was typed using pep484 but not inside the docstring.

Closes #4117 Closes #4593
setuptools_scm has been removed and replaced by tbump in order to not have hidden runtime dependencies to setuptools
Fix a crash when a test function is decorated with @pytest.fixture and astroid can't infer the name of the decorator when using open without with.

Closes #4612
Added deprecated-decorator: Emitted when deprecated decorator is used.

Closes #4429
Added ignore-paths behaviour. Defined regex patterns are matched against full file path.

Close #2541
Fix false negative for consider-using-with if calls like open() were used outside of assignment expressions.
The warning for arguments-differ now signals explicitly the difference it detected by naming the argument or arguments that changed and the type of change that occurred.
Suppress consider-using-with inside context managers.

Closes #4430
Added --fail-on option to return non-zero exit codes regardless of --fail-under value.
numversion tuple contains integers again to fix multiple pylint's plugins that relied on it

Closes #4420
Fix false-positive too-many-ancestors when inheriting from builtin classes, especially from the collections.abc module

Closes #4166 Closes #4415
Stdlib deprecated modules check is moved to stdlib checker. New deprecated modules are added.
Fix raising false-positive no-member on abstract properties
Created new error message called arguments-renamed which identifies any changes at the parameter names of overridden functions.

Closes #3536
New checker consider-using-dict-items. Emitted when iterating over dictionary keys and then indexing the same dictionary with the key within loop body.

Closes #3389
Don't emit import-error if import guarded behind if sys.version_info >= (x, x)
Fix incompatibility with Python 3.6.0 caused by typing.Counter and typing.NoReturn usage

Closes #4412
New checker use-maxsplit-arg. Emitted either when accessing only the first or last element of str.split().

Closes #4440
Add ignore_signatures to duplicate code checker

Closes #3619
Fix documentation errors in "Block disables" paragraph of User Guide.
New checker unnecessary-dict-index-lookup. Emitted when iterating over dictionary items (key-value pairs) and accessing the value by index lookup.

Closes #4470
New checkerconsider-using-from-import. Emitted when a submodule/member of a package is imported and aliased with the same name.

Closes #2309
Allow comma-separated list in output-format and separate output files for each specified format.

Closes #1798
Make using-constant-test detect constant tests consisting of list literals like [] and [1, 2, 3].
Improved error message of unnecessary-comprehension checker by providing code suggestion.

Closes #4499
New checker unused-private-member. Emitted when a private member (i.e., starts with __) of a class is defined but not used.

Closes #4483
Fix false negative of consider-using-enumerate when iterating over an attribute.

Closes #3657
New checker invalid-class-object. Emitted when a non-class is assigned to a __class__ attribute.

Closes #585
Fix a crash when a plugin from the configuration could not be loaded and raise an error 'bad-plugin-value' instead

Closes #4555
Added handling of floating point values when parsing configuration from pyproject.toml

Closes #4518
invalid-length-returned, now also works when nothing at all is returned following an upgrade in astroid.
logging-format-interpolation and logging-not-lazy, now works on logger class created from renamed logging import following an upgrade in astroid.
Fix false-positive no-member with generic base class

Closes PyCQA/astroid#942
Fix assigning-non-slot false-positive with base that inherits from typing.Generic

Closes #4509 Closes PyCQA/astroid#999
New checker invalid-all-format. Emitted when __all__ has an invalid format, i.e. isn't a tuple or list.
Fix false positive unused-variable and undefined-variable with Pattern Matching in Python 3.10
New checker await-outside-async. Emitted when await is used outside an async function.
Clarify documentation for typing extension.

Closes #4545
Add new extension CodeStyleChecker. It includes checkers that can improve code consistency. As such they don't necessarily provide a performance benefit and are often times opinionated.
New checker consider-using-tuple. Emitted when an in-place defined list or set can be replaced by a tuple.
New checker consider-using-namedtuple-or-dataclass. Emitted when dictionary values can be replaced by namedtuples or dataclass instances.
Fix error that occurred when using slice as subscript for dict.
Reduce false-positives around inference of .value and .name properties on Enum subclasses, following an upgrade in astroid

Closes #1932 Closes #2062
Fix issue with cached_property that caused invalid-overridden-method error when overriding a property.

Closes #4023
Fix unused-import false positive for imported modules referenced in attribute lookups in type comments.

Closes #4603

`v2.8.3`

Compare Source

Pin astroid to 2.5.6 for pylint 2.8.3

`v2.8.2`

Compare Source

Keep __pkginfo__.numversion a tuple to avoid breaking pylint-django.

Closes #4405
scm_setuptools has been added to the packaging.
Pylint's tags are now the standard form vX.Y.Z and not pylint-X.Y.Z anymore.

`v2.8.1`

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Add numversion back (temporarily) in __pkginfo__ because it broke Pylama and revert the unnecessary pylint.version breaking change.

Closes #4399

`v2.8.0`

Compare Source

New refactoring message consider-using-with. This message is emitted if resource-allocating functions or methods of the standard library (like open() or threading.Lock.acquire()) that can be used as a context manager are called without a with block.

Closes #3413
Resolve false positives on unused variables in decorator functions

Closes #4252
Add new extension ConfusingConsecutiveElifChecker. This optional checker emits a refactoring message (R5601 confusing-consecutive-elif) if if/elif statements with different indentation levels follow directly one after the other.
New option --output=<file> to output result to a file rather than printing to stdout.

Closes #1070
Use a prescriptive message for unidiomatic-typecheck

Closes #3891
Apply const-naming-style to module constants annotated with typing.Final
The packaging is now done via setuptools exclusively. doc, tests, man, elisp and Changelog are not packaged anymore - reducing the size of the package by 75%.
Debian packaging is now (officially) done in https://salsa.debian.org/python-team/packages/pylint.
The 'doc' extra-require has been removed.
__pkginfo__ now only contain __version__ (also accessible with pylint.__version__), other meta-information are still accessible with import importlib;metadata.metadata('pylint').
COPYING has been renamed to LICENSE for standardization.
Fix false-positive used-before-assignment in function returns.

Closes #4301
Updated astroid to 2.5.3

Closes #2822, #4206, #4284
Add consider-using-min-max-builtin check for if statement which could be replaced by Python builtin min or max

Closes #3406
Don't auto-enable postponed evaluation of type annotations with Python 3.10
Update astroid to 2.5.4
Add new extension TypingChecker. This optional checker can detect the use of deprecated typing aliases and can suggest the use of the alternative union syntax where possible. (For example, 'typing.Dict' can be replaced by 'dict', and 'typing.Unions' by '|', etc.) Make sure to check the config options if you plan on using it!
Reactivates old counts in report mode.

Closes #3819
During detection of inconsistent-return-statements consider that assert False is a return node.

Closes #4019
Run will not fail if score exactly equals config.fail_under.
Functions that never returns may declare NoReturn as type hints, so that inconsistent-return-statements is not emitted.

Closes #4122, #4188
Improved protected access checks to allow access inside class methods

Closes #1159
Fix issue with PEP 585 syntax and the use of collections.abc.Set
Fix issue that caused class variables annotated with typing.ClassVar to be identified as class constants. Now, class variables annotated with typing.Final are identified as such.

Closes #4277
Continuous integration with read the doc has been added.

Closes #3850
Don't show DuplicateBasesError for attribute access
Fix crash when checking setup.cfg for pylint config when there are non-ascii characters in there

Closes #4328
Allow code flanked in backticks to be skipped by spellchecker

Closes #4319
Allow Python tool directives (for black, flake8, zimports, isort, mypy, bandit, pycharm) at beginning of comments to be skipped by spellchecker

Closes #4320
Fix issue that caused emacs pylint to fail when used with tramp
Improve check for invalid PEP 585 syntax inside functions if postponed evaluation of type annotations is enabled
Improve check for invalid PEP 585 syntax as default function arguments

`v2.7.4`

Compare Source

Fix a problem with disabled msgid not being ignored

Closes #4265
Fix issue with annotated class constants
- Closes #4264

`v2.7.3`

Compare Source

Introduce logic for checking deprecated attributes in DeprecationMixin.
Reduce usage of blacklist/whitelist terminology. Notably, extension-pkg-allow-list is an alternative to extension-pkg-whitelist and the message blacklisted-name is now emitted as disallowed-name. The previous names are accepted to maintain backward compatibility.
Move deprecated checker to DeprecatedMixin

Closes #4086
Bump astroid version to 2.5.2
Fix false positive for method-hidden when using private attribute and method

Closes #3936
use-symbolic-message-instead now also works on legacy messages like C0111 (missing-docstring).
Remove unwanted print to stdout from _emit_no_member
Introduce a command-line option to specify pyreverse output directory

Closes #4159
Fix issue with Enums and class-attribute-naming-style=snake_case

Closes #4149
Add allowed-redefined-builtins option for fine tuning redefined-builtin check.

Close #3263
Fix issue when executing with python -m pylint

Closes #4161
Exempt typing.TypedDict from too-few-public-methods check.

Closes #4180
Fix false-positive no-member for typed annotations without default value.

Closes #3167
Add --class-const-naming-style for Enum constants and class variables annotated with typing.ClassVar

Closes #4181
Fix astroid.Inference error for undefined-variables with ``len()```

Closes #4215
Fix column index on FIXME warning messages

Closes #4218
Improve handling of assignment expressions, better edge case handling

Closes #3763, #4238
Improve check if class is subscriptable PEP585
Fix documentation and filename handling of --import-graph
Fix false-positive for unused-import on class keyword arguments

Closes #3202
Fix regression with plugins on PYTHONPATH if latter is cwd

Closes #4252

`v2.7.2`

Compare Source

Fix False Positive on Enum.__members__.items(), Enum.__members__.values, and Enum.__members__.keys Closes #4123
Properly strip dangerous sys.path entries (not just the first one)

Closes #3636

`v2.7.1`

Compare Source

Expose UnittestLinter in pylint.testutils
Don't check directories starting with '.' when using register_plugins

Closes #4119

`v2.7.0`

Compare Source

Introduce DeprecationMixin for reusable deprecation checks.

Closes #4049
Fix false positive for builtin-not-iterating when map receives iterable

Closes #4078
Python 3.6+ is now required.
Fix false positive for builtin-not-iterating when zip receives iterable
Add nan-comparison check for NaN comparisons
Bug fix for empty-comment message line number.

Closes #4009
Only emit bad-reversed-sequence on dictionaries if below py3.8

Closes #3940
Handle class decorators applied to function.

Closes #3882
Add check for empty comments
Fix minor documentation issue in contribute.rst
Enums are now required to be named in UPPER_CASE by invalid-name.

Close #3834
Add missing checks for deprecated functions.
Postponed evaluation of annotations are now recognized by default if python version is above 3.10

Closes #3992
Fix column metadata for anomalous backslash lints
Drop support for Python 3.5
Add support for pep585 with postponed evaluation

Closes #3320
Check alternative union syntax - PEP 604

Closes #4065
Fix multiple false positives with assignment expressions

Closes #3347, #3953, #3865, #3275
Fix TypedDict inherit-non-class false-positive Python 3.9+

Closes #1927
Fix issue with nested PEP 585 syntax
Fix issue with nested PEP 604 syntax
Fix a crash in undefined-variable caused by chained attributes in metaclass

Close #3742
Fix false positive for not-async-context-manager when contextlib.asynccontextmanager is used

Close #3862
Fix linter multiprocessing pool shutdown (triggered warnings when runned in parallels with other pytest plugins)

Closes #3779
Fix a false-positive emission of no-self-use and unused-argument for methods of generic structural types (Protocol[T])

Closes #3885
Fix bug that lead to duplicate messages when using --jobs 2 or more.

Close #3584
Adds option check-protected-access-in-special-methods in the ClassChecker to activate/deactivate protected-access message emission for single underscore prefixed attribute in special methods.

Close #3120
Fix vulnerable regular expressions in pyreverse

Close #3811
inconsistent-return-statements message is now emitted if one of try/except statement is not returning explicitly while the other do.

Closes #3468
Fix useless-super-delegation false positive when default keyword argument is a dictionnary.

Close #3773
Fix a crash when a specified config file does not exist
Add support to ignored-argument-names in DocstringParameterChecker and adds useless-param-doc and useless-type-doc messages.

Close #3800
Enforce docparams consistently when docstring is not present

Close #2738
Fix duplicate-code false positive when lines only contain whitespace and non-alphanumeric characters (e.g. parentheses, bracket, comman, etc.)
Improve lint message for singleton-comparison with bools
Fix spell-checker crash on indented docstring lines that look like # comments

Close #3786
Fix AttributeError in checkers/refactoring.py
Improve sphinx directives spelling filter
Fix a bug with postponed evaluation when using aliases for annotations.

Close #3798
Fix minor documentation issues
Improve the performance of the line length check.
Removed incorrect deprecation of inspect.getfullargspec
Fix signature-differs false positive for functions with variadics

Close #3737
Fix a crash in consider-using-enumerate when encountering range() without arguments

Close #3735
len-as-conditions is now triggered only for classes that are inheriting directly from list, dict, or set and not implementing the __bool__ function, or from generators like range or list/dict/set comprehension. This should reduce the false positives for other classes, like pandas's DataFrame or numpy's Array.

Close #1879
Fixes duplicate-errors not working with -j2+

Close #3314
generated-members now matches the qualified name of members

Close #2498
Add check for bool function to len-as-condition
Add simplifiable-condition check for extraneous constants in conditionals using and/or.
Add condition-evals-to-constant check for conditionals using and/or that evaluate to a constant.

Close #3407
Changed setup.py to work with distlib

Close #3555
New check: consider-using-generator

This check warns when a comprehension is used inside an any or all function, since it is unnecessary and should be replaced by a generator instead. Using a generator would be less code and way faster.

Close #3165
Add Github Actions to replace Travis and AppVeyor in the future

`v2.6.2`

Astroid version has been set as < 2.5

Close #4093

`v2.6.0`

Compare Source

Fix various scope-related bugs in undefined-variable checker

Close #1082, #3434, #3461
bad-continuation and bad-whitespace have been removed, black or another formatter can help you with this better than Pylint

Close #246, #289, #638, #747, #1148, #1179, #1943, #2041, #2301, #2304, #2944, #3565
The no-space-check option has been removed. It's no longer possible to consider empty line like a trailing-whitespace by using clever options

Close #1368
missing-kwoa is no longer emitted when dealing with overload functions

Close #3655
mixed-indentation has been removed, it is no longer useful since TabError is included directly in python3

Close #2984 #3573
Add super-with-arguments check for flagging instances of Python 2 style super calls.
Add an faq detailing which messages to disable to avoid duplicates w/ other popular linters
Fix superfluous-parens false-positive for the walrus operator

Close #3383
Fix fail-under not accepting floats
Fix a bug with ignore-docstrings ignoring all lines in a module
Fix pre-commit config that could lead to undetected duplicate lines of code
Fix a crash in parallel mode when the module's filepath is not set

Close #3564
Add raise-missing-from check for exceptions that should have a cause.
Support both isort 4 and isort 5. If you have pinned isort 4 in your projet requirements, nothing changes. If you use isort 5, though, note that the known-standard-library option is not interpreted the same in isort 4 and isort 5 (see the migration guide in isort documentation for further details). For compatibility's sake for most pylint users, the known-standard-library option in pylint now maps to extra-standard-library in isort 5. If you really want what known-standard-library now means in isort 5, you must disable the wrong-import-order check in pylint and run isort manually with a proper isort configuration file.

Close #3722

`v2.5.3`

Compare Source

Fix a regression where disable comments that have checker names with numbers in them are not parsed correctly

Close #3666
property-with-parameters properly handles abstract properties

Close #3600
continue-in-finally no longer emitted on Python 3.8 where it's now valid

Close #3612
Fix a regression where messages with dash are not fully parsed

Close #3604
In a TOML configuration file, it's now possible to use rich (non-string) types, such as list, integer or boolean instead of strings. For example, one can now define a list of message identifiers to enable like this::

enable = [ "use-symbolic-message-instead", "useless-suppression", ]

Close #3538
Fix a regression where the score was not reported with multiple jobs

Close #3547
Protect against AttributeError when checking cell-var-from-loop

Close #3646

`v2.5.2`

Compare Source

pylint.Run accepts do_exit as a deprecated parameter

Close #3590

`v2.5.1`

Compare Source

Fix a crash in method-hidden lookup for unknown base classes

Close #3527
Revert pylint.Run's exit parameter to do_exit

This has been inadvertently changed several releases ago to do_exit.

Close #3533
no-value-for-parameter variadic detection has improved for assign statements

Close #3563
Allow package files to be properly discovered with multiple jobs

Close #3524
Allow linting directories without __init__.py which was a regression in 2.5.

Close #3528

`v2.5.0`

Compare Source

Fix a false negative for undefined-variable when using class attribute in comprehension.

Close #3494
Fix a false positive for undefined-variable when using class attribute in decorator or as type hint.

Close #511 Close #1976
Remove HTML quoting of messages in JSON output.

Close #2769
Adjust the invalid-name rule to work with non-ASCII identifiers and add the non-ascii-name rule.

Close #2725
Positional-only arguments are taken in account for useless-super-delegation
unidiomatic-typecheck is no longer emitted for in and not in operators

Close #3337
Positional-only argument annotations are taken in account for unused-import

Close #3462
Add a command to list available extensions.
Allow used variables to be properly consumed when different checks are enabled / disabled

Close #3445
Fix dangerous-default-value rule to account for keyword argument defaults

Close #3373
Fix a false positive of self-assigning-variable on tuple unpacking.

Close #3433
no-self-use is no longer emitted for typing stubs.

Close #3439
Fix a false positive for undefined-variable when __class__ is used

Close #3090
Emit invalid-name for variables defined in loops at module level.

Close #2695
Add a check for cases where the second argument to isinstance is not a type.

Close #3308
Add 'notes-rgx' option, to be used for fixme check.

Close #2874
function-redefined exempts function redefined on a condition.

Close #2410
typing.overload functions are exempted from docstring checks

Close #3350
Emit invalid-overridden-method for improper async def overrides.

Close #3355
Do not allow python -m pylint ... to import user code

python -m pylint ... adds the current working directory as the first element of sys.path. This opens up a potential security hole where pylint will import user level code as long as that code resides in modules having the same name as stdlib or pylint's own modules.

Close #3386
Add dummy-variables-rgx option for _redeclared-assigned-name check.

Close #3341
Fixed graph creation for relative paths
Add a check for asserts on string literals.

Close #3284
not in is considered iterating context for some of the Python 3 porting checkers.
A new check inconsistent-quotes was added.
Add a check for non string assignment to name attribute.

Close #583
__pow__, __imatmul__, __trunc__, __floor__, and __ceil__ are recognized as special method names.

Close #3281
Added errors for protocol functions when invalid return types are detected. E0304 (invalid-bool-returned): bool did not return a bool E0305 (invalid-index-returned): index did not return an integer E0306 (invalid-repr-returned): repr did not return a string E0307 (invalid-str-returned): str did not return a string E0308 (invalid-bytes-returned): bytes did not return a string E0309 (invalid-hash-returned): hash did not return an integer E0310 (invalid-length-hint-returned): length_hint did not return a non-negative integer E0311 (invalid-format-returned): format did not return a string E0312 (invalid-getnewargs-returned): getnewargs did not return a tuple E0313 (invalid-getnewargs-ex-returned): getnewargs_ex did not return a tuple of the form (tuple, dict)

Close #560
missing-*-docstring can look for __doc__ assignments.

Close #3301
undefined-variable can now find undefined loop iterables

Close #498
safe_infer can infer a value as long as all the paths share the same type.

Close #2503
Add a --fail-under flag, also configurable in a .pylintrc file. If the final score is more than the specified score, it's considered a success and pylint exits with exitcode 0. Otherwise, it's considered a failure and pylint exits with its current exitcode based on the messages issued.

Close #2242
Don't emit line-too-long for multilines when disable=line-too-long comment stands at their end

Close #2957
Fixed an AttributeError caused by improper handling of dataclasses inference in pyreverse

Close #3256
Do not exempt bare except from undefined-variable and similar checks

If a node was wrapped in a TryExcept, pylint was taking a hint from the except handler when deciding to emit or not a message. We were treating bare except as a fully fledged ignore but only the corresponding exceptions should be handled that way (e.g. NameError or ImportError)

Close #3235
No longer emit assignment-from-no-return when a function only raises an exception

Close #3218
Allow import aliases to exempt import-error when used in type annotations.

Close #3178
Ellipsis` is exempted from multiple-statements`` for function overloads.

Close #3224
No longer emit invalid-name for non-constants found at module level.

Pylint was taking the following statement from PEP-8 too far, considering all module level variables as constants, which is not what the statement is saying:

Constants are usually defined on a module level and written in all capital letters with underscores separating words.

Close #3111 Close #3132
Allow implicit-str-concat-in-sequence to be emitted for string juxtaposition

Close #3030
implicit-str-concat-in-sequence was renamed implicit-str-concat
The json reporter no longer bypasses redirect_stdout. Close #3227
Move NoFileError, OutputLine, FunctionalTestReporter, FunctionalTestFile, LintModuleTest and related methods from test_functional.py to pylint.testutils to help testing for 3rd party pylint plugins.
Can read config from a setup.cfg or pyproject.toml file.

Close #617
Fix exception-escape false positive with generators

Close #3128
inspect.getargvalues is no longer marked as deprecated.
A new check f-string-without-interpolation was added

Close #3190
Flag mutable collections.* utilities as dangerous defaults

Close #3183
docparams extension supports multiple types in raises sections.

Multiple types can also be separated by commas in all valid sections.

Closes #2729
Allow parallel linting when run under Prospector
Fixed false positives of method-hidden when a subclass defines the method that is being hidden.

Closes #414
Python 3 porting mode is 30-50% faster on most codebases
Python 3 porting mode no longer swallows syntax errors

Closes #2956
Pass the actual PyLinter object to sub processes to allow using custom PyLinter classes.

PyLinter object (and all its members except reporter) needs to support pickling so the PyLinter object can be passed to worker processes.
Clean up setup.py

Make pytest-runner a requirement only if running tests, similar to McCabe.

Clean up the setup.py file, resolving a number of warnings around it.
Handle SyntaxError in files passed via --from-stdin option

Pylint no longer outputs a traceback, if a file, read from stdin, contains a syntaxerror.
Fix uppercase style to disallow 3+ uppercase followed by lowercase.
Fixed undefined-variable and unused-import false positives when using a metaclass via an attribute.

Close #1603
Emit unused-argument for functions that partially uses their argument list before raising an exception.

Close #3246
Fixed broad_try_clause extension to check try/finally statements and to check for nested statements (e.g., inside of an if statement).
Recognize classes explicitly inheriting from abc.ABC or having an abc.ABCMeta metaclass as abstract. This makes them not trigger W0223.

Closes #3098
Fix overzealous arguments-differ when overridden function uses variadics

No message is emitted if the overriding function provides positional or keyword variadics in its signature that can feasibly accept and pass on all parameters given by the overridden function.

Close #1482 Close #1553
Multiple types of string formatting are allowed in logging functions.

The logging-fstring-interpolation message has been brought back to allow multiple types of string formatting to be used.

Close #3361

`v2.4.4`

Compare Source

Exempt all the names found in type annotations from unused-import

The previous code was assuming that only typing names need to be exempted, but we need to do that for the rest of the type comment names as well.

Close #3112
Relax type import detection for names that do not come from the typing module

Close #3191

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Edited Dec 11, 2025 by Renovate Bot

chore(deps): update dependency pylint to v2.17.7

Release Notes

False Positives Fixed

Other Bug Fixes

Other Bug Fixes

What's new in Pylint 2.17.5?

False Positives Fixed

Other Bug Fixes

Other Changes

False Positives Fixed

Other Bug Fixes

What's new in Pylint 2.17.3?

False Positives Fixed

Other Bug Fixes

False Positives Fixed

Other Bug Fixes

False Positives Fixed

Other Bug Fixes

Internal Changes

What's new in Pylint 2.17.0?

New Features

New Checks

False Positives Fixed

False Negatives Fixed

Other Bug Fixes

Other Changes

False Positives Fixed

False Positives Fixed

Other Bug Fixes

New Features

False Positives Fixed

Other Bug Fixes

Other Bug Fixes

Summary -- Release highlights

What's new in Pylint 2.16.0?

Changes requiring user actions

New Features

New Checks

Extensions

False Positives Fixed

False Negatives Fixed

Other Bug Fixes

Other Changes

Internal Changes

False Positives Fixed

Other Bug Fixes

False Positives Fixed

Other Bug Fixes

False Positives Fixed

False Positives Fixed

Other Bug Fixes

False Positives Fixed

Other Bug Fixes

What's new in Pylint 2.15.5?

False Positives Fixed

Other Bug Fixes

Other Changes

False Positives Fixed

Other Bug Fixes

Other Changes

New Checks

False Positives Fixed

False Negatives Fixed

Other Bug Fixes

Other Changes

Internal Changes

Summary -- Release highlights

New checkers

Removed checkers

Extensions

Other Changes

Deprecations

v2.13.0: 2.13.0

v2.12.1: 2.12.1

v2.12.0: 2.12.0

Configuration

Merge request reports

`v2.13.0`: 2.13.0

`v2.12.1`: 2.12.1

`v2.12.0`: 2.12.0