For some reason the mypy.ini of this package is ignored for me every second run and get the problem that ruamel is missing. Just added the content of this file to my mypy.ini and it worked.

In both cases they've called as_cached_view which calls as_view

With the current stubs I get

error: No overload variant of "url" matches argument types "str", "APIView", "str"
note: Possible overload variants:
note:     def url(regex: str, view: Callable[..., HttpResponseBase], kwargs: Dict[str, Any] = ..., name: str = ...) -> URLPattern
note:     def url(regex: str, view: Tuple[List[URLResolver], Optional[str], Optional[str]], kwargs: Dict[str, Any] = ..., name: str = ...) -> URLResolver
note:     def url(regex: str, view: List[Union[URLResolver, str]], kwargs: Dict[str, Any] = ..., name: str = ...) -> URLResolver

They should be marked as returning some sort of Callable variant I think

See https://docs.python.org/3/library/typing.html#typing.Literal

I think the project should either document the Python 3.8 requirement or remove it and test against earlier versions.

Thanks for all your work here!

There seems to be back and forth for this parameter on the type. I see it was once changed from a Tuple to a List but has since changed back to a Tuple in the drf-yasg repo. The documentation also reflects this change. The stubs need to be updated.

-    permission_classes: Optional[List[Type[BasePermission]]] = ...,
+    permission_classes: Optional[Tuple[Type[BasePermission]]] = ...,

I've got some code that sets the permission_classes arg for get_schema_view to (permissions.AllowAny,), and I get the error
error: Argument "permission_classes" to "get_schema_view" has incompatible type "Tuple[Type[AllowAny]]"; expected "Optional[Tuple[str]]"

Admittedly, in my particular use case it turns out I can delete the arg as it's the defaults, but if I wanted a non-default I'd get issues with mypy.