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ChangeLog
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------------------
Pylint's ChangeLog
------------------
What's New in Pylint 2.8.0?
===========================
Release date: TBA
..
Put new features here
What's New in Pylint 2.7.3?
===========================
Release date: TBA
..
Put bug fixes that will be cherry-picked to latest major version here
* Fix issue with Enums and `class-attribute-naming-style=snake_case`
Closes #4149
What's New in Pylint 2.7.2?
===========================
Release date: 2021-02-28
* Fix False Positive on `Enum.__members__.items()`, `Enum.__members__.values`, and `Enum.__members__.keys`
Closes #4123
* Properly strip dangerous sys.path entries (not just the first one)
Closes #3636
* Workflow and packaging improvements
What's New in Pylint 2.7.1?
===========================
Release date: 2021-02-23
* Expose `UnittestLinter` in pylint.testutils
* Don't check directories starting with '.' when using register_plugins
Closes #4119
What's New in Pylint 2.7.0?
===========================
Release date: 2021-02-21
* 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](https://pypi.org/project/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
What's New in Pylint 2.6.1?
===========================
* Astroid version has been set as < 2.5
Close #4093
What's New in Pylint 2.6.0?
===========================
Release date: 2020-08-20
* 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
What's New in Pylint 2.5.4?
===========================
* Fix a crash caused by not guarding against `InferenceError` when calling `infer_call_result`
Close #3690
* Fix a crash in parallel mode when the module's filepath is not set
Close #3564
What's New in Pylint 2.5.3?
===========================
Release date: 2020-06-8
* 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
What's New in Pylint 2.5.2?
===========================
Release date: 2020-05-05
* ``pylint.Run`` accepts ``do_exit`` as a deprecated parameter
Close #3590
What's New in Pylint 2.5.1?
===========================
Release date: 2020-05-05
* 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
What's New in Pylint 2.5.0?
===========================
Release date: 2020-04-27
* 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 <score> 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
What's New in Pylint 2.4.4?
===========================
Release date: 2019-11-13
* 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
What's New in Pylint 2.4.3?
===========================
Release date: 2019-10-18
* Fix an issue with ``unnecessary-comprehension`` in comprehensions with additional repacking of elements.
Close #3148
* ``import-outside-toplevel`` is emitted for ``ImportFrom`` nodes as well.
Close #3175
* Do not emit ``no-method-argument`` for functions using positional only args.
Close #3161
* ``consider-using-sys-exit`` is no longer emitted when `exit` is imported in the local scope.
Close #3147
* `invalid-overridden-method` takes `abc.abstractproperty` in account
Close #3150
* Fixed ``missing-yield-type-doc`` getting incorrectly raised when
a generator does not document a yield type but has a type annotation.
Closes #3185
* ``typing.overload`` functions are exempted from ``too-many-function-args``
Close #3170
What's New in Pylint 2.4.2?
===========================
Release date: 2019-09-30
* ``ignored-modules`` can skip submodules. Close #3135
* ``self-assigning-variable`` skips class level assignments.
Close #2930
* ``consider-using-sys-exit`` is exempted when `exit()` is imported from `sys`
Close #3145
* Exempt annotated assignments without variable from ``class-variable-slots-conflict``
Close #3141
* Fix ``utils.is_error`` to account for functions returning early.
This fixes a false negative with ``unused-variable`` which was no longer triggered
when a function raised an exception as the last instruction, but the body of the function
still had unused variables.
Close #3028
What's New in Pylint 2.4.1?
===========================
Release date: 2019-09-25
* Exempt type checking definitions defined in both clauses of a type checking guard
Close #3127
* Exempt type checking definitions inside the type check guard
In a7f236528bb3758886b97285a56f3f9ce5b13a99 we added basic support
for emitting `used-before-assignment` if a variable was only defined
inside a type checking guard (using `TYPE_CHECKING` variable from `typing`)
Unfortunately that missed the case of using those type checking imports
inside the guard itself, which triggered spurious used-before-assignment errors.
Close #3119
* Require astroid >= 2.3 to avoid any compatibility issues.
What's New in Pylint 2.4.0?
===========================
Release date: 2019-09-24
* New check: ``import-outside-toplevel``
This check warns when modules are imported from places other than a
module toplevel, e.g. inside a function or a class.
* Handle inference ambiguity for ``invalid-format-index``
Close #2752
* Removed Python 2 specific checks such as ``relative-import``,
``invalid-encoded-data``, ``missing-super-argument``.
* Support forward references for ``function-redefined`` check.
Close #2540
* Handle redefinitions in case of type checking imports.
Close #2834
* Added a new check, ``consider-using-sys-exit``
This check is emitted when we detect that a quit() or exit() is invoked
instead of sys.exit(), which is the preferred way of exiting in program.
Close #2925
* ``useless-suppression`` check now ignores ``cyclic-import`` suppressions,
which could lead to false postiives due to incomplete context at the time
of the check.
Close #3064
* Added new checks, ``no-else-break`` and ``no-else-continue``
These checks highlight unnecessary ``else`` and ``elif`` blocks after
``break`` and ``continue`` statements.
Close #2327
* Don't emit ``protected-access`` when a single underscore prefixed attribute
is used inside a special method
Close #1802
* Fix the "statement" values in the PyLinter's stats reports by module.
* Added a new check, ``invalid-overridden-method``
This check is emitted when we detect that a method is overridden
as a property or a property is overridden as a method. This can indicate
a bug in the application code that will trigger a runtime error.
Close #2670
* Added a new check, ``arguments-out-of-order``
This check warns if you have arguments with names that match those in
a function's signature but you are passing them in to the function
in a different order.
Close #2975
* Added a new check, ``redeclared-assigned-name``
This check is emitted when ``pylint`` detects that a name
was assigned one or multiple times in the same assignment,
which indicate a potential bug.
Close #2898
* Ignore lambda calls with variadic arguments without a context.
Inferring variadic positional arguments and keyword arguments
will result into empty Tuples and Dicts, which can lead in
some cases to false positives with regard to no-value-for-parameter.
In order to avoid this, until we'll have support for call context
propagation, we're ignoring such cases if detected.
We already did that for function calls, but the previous fix
was not taking in consideration ``lambdas``
Close #2918
* Added a new check, ``self-assigning-variable``
This check is emitted when we detect that a variable is assigned
to itself, which might indicate a potential bug in the code application.
Close #2930
* Added a new check, ``property-with-parameters``.
This check is emitted when we detect that a defined property also
has parameters, which are useless.
Close #3006
* Excluded protocol classes from a couple of checks. Close #3002.
* Add a check `unnecessary-comprehension` that detects unnecessary comprehensions.
This check is emitted when ``pylint`` finds list-, set- or dict-comprehensions,
that are unnecessary and can be rewritten with the list-, set- or dict-constructors.
Close #2905
* Excluded PEP 526 instance and class variables from ``no-member``. Close #2945
* Excluded `attrs` from `too-few-public-methods` check. Close #2988.
* ``unused-import`` emitted for the right import names in function scopes.
Close #2928
* Dropped support for Python 3.4.
* ``assignment-from-no-return`` not triggered for async methods.
Close #2902
* Don't emit ``attribute-defined-outside-init`` for variables defined in setters.
Close #409
* Syntax errors report the column number.
Close #2914
* Support fully qualified typing imports for type annotations.
Close #2915
* Exclude ``__dict__`` from ``attribute-defined-outside-init``
* Fix pointer on spelling check when the error are more than one time in the same line.
Close #2895
* Fix crash happening when parent of called object cannot be determined
* Allow of in `GoogleDocstring.re_multiple_type`
* Added `subprocess-run-check` to handle subrocess.run without explicitly set `check` keyword.
Close #2848
* When we can't infer bare except handlers, skip ``try-except-raise``
Close #2853
* Handle more `unnecessary-lambda` cases when dealing with additional kwargs in wrapped calls
Close #2845
* Better postponed evaluation of annotations handling
Close #2847
* Support postponed evaluation of annotations for variable annotations.
Close #2838
* ``epylint.py_run`` defaults to ``python`` in case the current executable is not a Python one.
Close #2837
* Ignore raw docstrings when running Similarities checker with `ignore-docstrings=yes` option
* Fix crash when calling ``inherit_from_std_ex`` on a class which is its own ancestor
Close #2680
* Added a new check that warns the user if a function call is used inside a test but parentheses are missing.
Close #2658
* ``len-as-condition`` now only fires when a ``len(x)`` call is made without an explicit comparison
The message and description accompanying this checker has been changed
reflect this new behavior, by explicitly asking to either rely on the
fact that empty sequence are false or to compare the length with a scalar.
Close #2684
* Add ``preferred-module`` checker that notify if an import has a replacement module that should be used.
This check is emitted when ``pylint`` finds an imported module that has a
preferred replacement listed in ``preferred-modules``.
* ``assigning-non-slot`` not emitted for classes with unknown base classes.
Close #2807
* ``old-division`` is not emitted for non-Const nodes.
Close #2808
* Added method arguments to the dot writer for pyreverse.
Close #2139
* Support for linting file from stdin.
IDEs may benefit from the support for linting from an in-memory file.
Close #1187
* Added a new check `class-variable-slots-conflict`
This check is emitted when ``pylint`` finds a class variable that conflicts with a slot
name, which would raise a ``ValueError`` at runtime.
* Added new check: dict-iter-missing-items (E1141)
Close #2761
* Fix issue with pylint name in output of python -m pylint --version
Close #2764
* Relicense logo material under the CC BY-SA 4.0 license.
* Skip `if` expressions from f-strings for the `check_elif` checker
Close #2816
* C0412 (ungrouped-import) is now compatible with isort.
Close #2806
* Added new extension to detect too much code in a try clause
Close #2877
* ``signature-mutators`` option was added