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**************************
What's New in Pylint 2.9
**************************
:Release: 2.9
:Date: TBA
Summary -- Release highlights
=============================
New checkers
============
* ``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.
Other Changes
=============
* 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]``.
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