pylint 3.0.0a6

on Python PyPI

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