pylint-2.7.1

• Expose UnittestLinter in pylint.testutils

• Don't check directories starting with '.' when using register_plugins

  Closes #4119

pylint-2.7.0

• 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

pylint-2.6.2

• Astroid version has been set as < 2.5

  Close #4093

pylint-2.6.0

• 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

pylint-2.5.3

• 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

pylint-2.5.2

• pylint.Run accepts do_exit as a deprecated parameter

  Close #3590

pylint-2.5.1

• 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

pylint-2.5.0

• 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

pylint-2.4.4

• 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