Full changelog¶

What's New in Pylint 2.13.9?¶

Release date: 2022-05-13

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.

Refs #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

What's New in Pylint 2.13.8?¶

Release date: 2022-05-02

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

What's New in Pylint 2.13.7?¶

Release date: 2022-04-20

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

Closes #6408

What's New in Pylint 2.13.6?¶

Release date: 2022-04-20

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

What's New in Pylint 2.13.5?¶

Release date: 2022-04-06

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.

What's New in Pylint 2.13.4?¶

Release date: 2022-03-31

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 unnecessary-ellipsis checker when an ellipsis is used inside of a container or a lambda expression.

Closes #6036 Closes #6037 Closes #6048

What's New in Pylint 2.13.3?¶

Release date: 2022-03-29

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

What's New in Pylint 2.13.2?¶

Release date: 2022-03-27

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.

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

Refs #5987

What's New in Pylint 2.13.1?¶

Release date: 2022-03-26

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

Closes #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.

What's New in Pylint 2.13.0?¶

Release date: 2022-03-24

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.

Refs 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 definitions 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.

Refs #2366
Added several checkers to deal with unicode security issues (see Trojan Sources and PEP 672 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. UTF-16 and UTF-32 are not supported by Python 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
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

Fixes part of #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

def my_function():
  """My function.

  Raises:
    Exception: if something fails
  """
  raise ValueError

Closes #4955

Disable spellchecking of mypy rule names in ignore directives.

Closes #5929
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