2.12.0

• 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
  Clos...

v2.11.1

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

  Closes #5017

v2.11.0

• 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

• 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

• pylint does not crash when PYLINT_HOME does not exist.

  Closes #4883

v2.10.0

• 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

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

  Closes #3791

v2.9.5

• 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

• 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

• 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.