[flake8-slots] Rule SLOT002 doesn't take typing.NamedTuple into account

[autinerd]

Hello 😊

While adding the SLOT rules to Home Assistant, I found that the SLOT002 doesn't take subclasses of typing.NamedTuple in account, although they are the typed version of collections.namedtuple.

Thanks in advance!

[AlexWaygood]

Hi, thanks for opening the issue! Can you give a minimal code snippet as an example of where you think this rule should be emitting an error but isn't currently?

[AlexWaygood]

Ah, do you mean something like this?

from typing import NamedTuple

class Foo(NamedTuple("Foo", [("x", int)])):
    pass

It's unusual to inherit from a call-based typing.NamedTuple rather than to do something like

from typing import NamedTuple

class Foo(NamedTuple):
    x: int

And if you create a class-based typing.NamedTuple (the second way), it will create the __slots__ for you. But I suppose if you do inherit from a call-based typing.NamedTuple, we probably should emit the diagnostic the same as if it were a collections.namedtuple (and we currently don't).

[autinerd]

Oh, I didn't know that this example:

from typing import NamedTuple

class Foo(NamedTuple):
    x: int

will have the __slots__ automatically created, then it is not needed of course, thanks.

And I didn't know about the call-based NamedTuple as well 😅 (it is not used in the Home Assistant codebase), but that would be a good idea to add.