Problem: the special method `__new__` must match the arguments of the
`__init__` method even if `__new__` method does not use them. This
generate `unused-argument` for the `__new__` method.

Fix: the unused arguments check should not be done on the `__new__`
method if the `__init__` method is defined in the same class.

Update `unused-argument` test to include a check for the case of
`__init__` and `__new__` being defined in a class but `__new__` does not
use all of the argument. This is fine because `__new__` must have the
same argument of `__init__`.

Update with a second check in case of `__init__` being not defined in a
class. Then the unused arguments check must be done on `__new__`.

Fixes #3670

(cherry picked from commit 156da64)

Co-authored-by: Théo Battrel <[email protected]>

…8546)

(cherry picked from commit eeddd66)

…ut assignment. (#8541) (#8548)

(cherry picked from commit cb255ea)

Co-authored-by: Yilei "Dolee" Yang <[email protected]>

(cherry picked from commit b5f2b01)

…function contains both a positional-only parameter that has a default value, and ``**kwargs``. (#8556) (#8560)

(cherry picked from commit db17860)

Co-authored-by: Mark Byrne <[email protected]>

Resolve #8500

Co-authored-by: Pierre Sassoulas <[email protected]>
(cherry picked from commit 0cd41b1)

Co-authored-by: RSTdefg <[email protected]>

* Fix false positive for ``keyword-arg-before-vararg`` when a positional-only parameter with a default value precedes ``*args``.

Closes #8570

(cherry picked from commit 56fa5dc)

Co-authored-by: Mark Byrne <[email protected]>

…s with `default` keyword (#8582) (#8583)

(cherry picked from commit 4a485e2)

Co-authored-by: Jacob Walls <[email protected]>

Co-authored-by: Marc Mueller <[email protected]>
(cherry picked from commit 3d036b7)

Co-authored-by: Pierre Sassoulas <[email protected]>
(cherry picked from commit a83137d)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…ined ``__index__`` method. (#8619) (#8622)

Closes #8613

(cherry picked from commit f223c6d)

Co-authored-by: Mark Byrne <[email protected]>

…#8631)

(cherry picked from commit a59f3d5)

Co-authored-by: Pierre Sassoulas <[email protected]>

…8640)

Co-authored-by: Pierre Sassoulas <[email protected]>
(cherry picked from commit 434d49f)

Co-authored-by: Daniël van Noord <[email protected]>

Co-authored-by: Jacob Walls <[email protected]>