v3.0.0a7

3.0.0a7 is an alpha release, other breaking changes will be added before the official 3.0.0 release. Compared to 3.0.0a6, this alpha brings mainly python 3.12 compatibility but also the changes you would usually expect with a minor of regular size. It will requires some changes to the configuration that should be automated when 3.0.0 is out, but aren't yet. Those changes can make the configuration incompatible or at least not equivalent if used with pylint 2.x.

v2.17.5

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

v2.17.4

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

v2.17.3

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

v2.17.2

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

v3.0.0a6

3.0.0a6 is an alpha release, other breaking changes will be added before the official 3.0.0 release. We're including the new features and false negative fixes that will be in 3.0.0, so it's the latest current version of pylint.

Breaking Changes

• pyreverse now uses a new default color palette that is more colorblind
  friendly.
  The color scheme is taken from Paul Tol's Notes.
  If you prefer other colors, you can use the --color-palette option to
  specify custom colors.

  Closes #8251

• Everything related to the __implements__ construct was removed. It was
  based on PEP245
  that was proposed in 2001 and rejected in 2006.

  The capability from pyreverse to take __implements__ into account when
  generating diagrams
  was also removed.

  Refs #8404

• pyreverse: Support for the .vcg output format (Visualaization of
  Compiler Graphs) has been dropped.

  Closes #8416

• The warning when the now useless old pylint cache directory (pylint.d) was
  found was removed. The cache dir is documented in
  the
  FAQ.

  Refs #8462

Changes requiring user actions

• epylint was removed. It now lives at:
  https://github.com/emacsorphanage/pylint.

  Refs #7737

• The 'overgeneral-exceptions' option now only takes fully qualified name
  into account (builtins.Exception not Exception). If you overrode
  this option, you need to use the fully qualified name now.

  There's still a warning, but it will be removed in 3.1.0.

  Refs #8411

• Following a deprecation period, it's no longer possible to use MASTER
  or master as configuration section in setup.cfg or tox.ini. It's
  bad practice
  to not start sections titles with the tool name. Please use pylint.main
  instead.

  Refs #8465

New Features

• Add new option (--show-stdlib, -L) to pyreverse.
  This is similar to the behavior of --show-builtin in that standard
  library
  modules are now not included by default, and this option will include them.

  Closes #8181

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

• 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

• --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 used-before-assignment false positive when imports
  are made under the TYPE_CHECKING else if branch.

  Closes #8437

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

  Closes #8453

Other Changes

• Pylint now exposes its type annotations.

  Closes #5488 and #2079

• All code related to the optparse config parsing has been removed.

  Refs #8405

Internal Changes

• get_message_definition was removed from the base checker API. You can
  access
  message definitions through the MessageStore.

  Refs #8401

• Everything related to the __implements__ construct was removed. It was
  based on PEP245
  that was proposed in 2001 and rejected in 2006.

  All the classes inheriting Interface in pylint.interfaces were
  removed.
  Checker should only inherit BaseChecker or any of the other checker
  types
  from pylint.checkers. Reporter should only inherit BaseReporter.

  Refs #8404

• modname and msg_store are now required to be given in FileState.
  collect_block_lines has also been removed. Pylinter.current_name
  cannot be null anymore.

  Refs #8407

• 'Reporter.set_output' was removed in favor of 'reporter.out = stream'.

  Refs #8408

• A number of old utility functions and classes have been removed:

  MapReduceMixin: To make a checker reduce map data simply implement
  get_map_data and reduce_map_data.

  is_inside_lambda: Use utils.get_node_first_ancestor_of_type(x, nodes.Lambda)

  check_messages: Use utils.only_required_for_messages

  is_class_subscriptable_pep585_with_postponed_evaluation_enabled: Use
  is_postponed_evaluation_enabled(node) and
  is_node_in_type_annotation_context(node)

  get_python_path: assumption that there's always an init.py is not
  true since
  python 3.3 and is causing problems, particularly with PEP 420. Use
  discover_package_path
  and pass source root(s).

  fix_import_path: Use augmented_sys_path and pass additional
  sys.path
  entries as an argument obtained from discover_package_path.

  get_global_option: Use checker.linter.config to get all global
  options.

  Related private objects have been removed as well.

  Refs #8409

• colorize_ansi now only accept a MessageStyle object.

  Refs #8412

• 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

• Following a deprecation period, Pylinter.check now only work with
  sequences of strings, not strings.

  Refs #8463

• Following a deprecation period, ColorizedTextReporter only accepts
  ColorMappingDict.

  Refs #8464

• Following a deprecation period, MessageTest's end_line and
  end_col_offset
  must be accurate in functional tests (for python 3.8 or above on cpython, and
  for
  python 3.9 or superior on pypy).

  Refs #8466

• Following a deprecation period, the do_exit argument of the Run class
  (and of the _Run
  class in testutils) were removed.

  Refs #8472

• Following a deprecation period, the py_version argument of the
  MessageDefinition.may_be_emitted function is now required. The most
  likely solution
  is to use 'linter.config.py_version' if you need to keep using this
  function, or to use 'MessageDefinition.is_message_enabled' instead.

  Refs #8473

• Following a deprecation period, the OutputLine class now requires
  the right number of argument all the time. The functional output can be
  regenerated automatically to achieve that easily.

  Refs #8474

• Following a deprecation period, is_typing_guard,
  is_node_in_typing_guarded_import_block and
  is_node_in_guarded_import_block: from pylint.utils were removed: use
  a combination of
  is_sys_guard and in_type_checking_block instead.

  Refs #8475

• Following a deprecation period, the location argument of the
  Message class must now be a MessageLocationTuple.

  Refs #8477

• Following a deprecation period, the check_single_file function of the
  Pylinter is replaced by Pylinter.check_single_file_item.

  Refs #8478

v2.17.1

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

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

False Positives Fixed

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

  Closes #8205

v2.16.3

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