- *slots*: If true (the default is ``False``),:attr:`~object.__slots__` attribute

will be generated and new class will be returned instead of the original one.

If:attr:`!__slots__` is already defined in the class, then:exc:`TypeError`

is raised. Calling no-arg:func:`super` in dataclasses using ``slots=True`` will result in

the following exception being raised:

``TypeError: super(type, obj): obj must be an instance or subtype of type``.

The two-arg:func:`super` is a valid workaround. See:gh:`90562` for full details.

is raised.

..warning::

Calling no-arg:func:`super` in dataclasses using ``slots=True``

will result in the following exception being raised:

``TypeError: super(type, obj): obj must be an instance or subtype of type``.

The two-arg:func:`super` is a valid workaround.

See:gh:`90562` for full details.

..warning::

Passing parameters to a base class:meth:`~object.__init_subclass__`

when using ``slots=True`` will result in a:exc:`TypeError`.

Either use ``__init_subclass__`` with no parameters

or use default values as a workaround.

See:gh:`91126` for full details.

..versionadded::3.10

self.assertEqual(A().__dict__, {})

A()

deftest_slots_with_wrong_init_subclass(self):

classWrongSuper:

def__init_subclass__(cls,arg):

withself.assertRaisesRegex(

TypeError,

"missing 1 required positional argument: 'arg'",

):

classWithWrongSuper(WrongSuper,arg=1):

classCorrectSuper:

args= []

def__init_subclass__(cls,arg="default"):

cls.args.append(arg)

classWithCorrectSuper(CorrectSuper):

self.assertEqual(CorrectSuper.args, ["default","default"])

classTestDescriptors(unittest.TestCase):

deftest_set_name(self):