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**************************
What's New in Pylint 2.9
**************************
:Release: 2.9
:Date: 2021-06-29
Summary -- Release highlights
=============================
Pylint is now compatible with python 3.10.
A lot of new checks have been added, some non-opinionated performance warnings
like ``use-maxsplit-arg``, some consensual style warnings like
``unnecessary-dict-index-lookup`` or new deprecation checks.
We're aiming to reduce pylint noise for first time users and making some
new checks optional is a step in that direction. In order to do that we
created an optional code style checker that can be loaded using
``pylint.extensions.code_style`` with the ``load-plugins`` options.
More than ever, if as a veteran you want the most checks you can possibly get,
[you should check the list of pylint extensions.](http://pylint.pycqa.org/en/latest/technical_reference/extensions.html#optional-pylint-checkers-in-the-extensions-module).
New checkers
============
* ``deprecated-decorator``: Emitted when deprecated decorator is used.
* ``consider-using-dict-items``: Emitted when iterating over dictionary keys and then
indexing the same dictionary with the key within loop body.
* ``use-maxsplit-arg``: Emitted either when accessing only the first or last
element of ``str.split()``.
* An ``ignore_signatures`` option has been added to the similarity checker. It will permits to reduce false positives when multiple functions have the same parameters.
* ``unnecessary-dict-index-lookup``: Emitted when iterating over dictionary items
(key-value pairs) and accessing the value by index lookup.
* ``consider-using-from-import``: Emitted when a submodule/member of a package is imported and aliased with the same name.
* New checker ``unused-private-member``: Emitted when a private member (i.e., starts with ``__``) of a class is defined but not used.
* New checker ``invalid-class-object``: Emitted when a non-class is assigned to a ``__class__`` attribute.
* ``invalid-all-format``: Emitted when ``__all__`` has an invalid format,
i.e. isn't a ``tuple`` or ``list``.
* New checker ``await-outside-async``: Emitted when await is used outside an async function.
* Add new extension ``CodeStyleChecker``. It includes checkers that can improve code
consistency. As such they don't necessarily provide a performance benefit
and are often times opinionated.
* ``consider-using-tuple``: Emitted when an in-place defined list or set can be replaced by a tuple.
* ``consider-using-namedtuple-or-dataclass``: Emitted when dictionary values
can be replaced by namedtuples or dataclass instances.
Other Changes
=============
* Add type annotations to pyreverse dot files
* Pylint's tags are now the standard form ``vX.Y.Z`` and not ``pylint-X.Y.Z`` anymore.
* Fix false-positive ``too-many-ancestors`` when inheriting from builtin classes,
especially from the ``collections.abc`` module
* The output messages for ``arguments-differ`` error message have been customized based on the different error cases.
* New option ``--fail-on=<msg ids>`` to return non-zero exit codes regardless of ``fail-under`` value.
* A new error called ``arguments-renamed`` has been created, which identifies any changes at the parameter names
of overridden functions. It aims to separate the functionality of ``arguments-differ``.
* Fix incompatibility with Python 3.6.0 caused by ``typing.Counter`` and ``typing.NoReturn`` usage
* Allow comma-separated list in ``output-format`` and separate output files for
each specified format. Each output file can be defined after a semicolon for example : ``--output-format=json:myfile.json,colorized``
* The ``using-constant-test`` checker now detects constant tests consisting of list literals
like ``[]`` and ``[1, 2, 3]``.
* ``ignore-paths`` configuration directive has been added. Defined regex patterns are matched against file path.
* Added handling of floating point values when parsing configuration from pyproject.toml
* Fix false positive ``useless-type-doc`` on ignored argument using ``pylint.extensions.docparams`` when a function
was typed using pep484 but not inside the docstring.
* Fix missing support for detecting deprecated aliases to existing functions/methods.
functions/methods.
* Added various deprecated functions/methods for python 3.10, 3.7, 3.6 and 3.3
|
