[Python] In Python, how to enforce abstract method implementation in chain derived classes?

In python, I can use ABC and abstractmethod to create an abstract class with some required methods:

class Base(ABC):
@abstractmethod
def tester(self)->str:
pass


I create a derived class A that must implement the methods:

class A(Base):
def tester(self) -> str:
return 'A'


I now need another class B that derives from A, and inherits some other functions and attributes. However, I want to force B to implement its own version of those abstract methods. I have tried making B derive from Base as well:

class B(A, Base):
# method "tester" is not implemented.
pass


I want my linter to recognise that B does not implement that method and warn me about it. It doesn't do that. (I am using VSCODE with Pylance and Ruff.)

a=A() # this is fine
b=B() # this should warn me


Is there some way to achieve this?

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