Determine if method is still abstract

I have one base class with abstractmethod and subclass which implements this method. How to determine in runtime if in object (without checking type of object or calling method) that method is abstract or not?

class Base:
    @abc.abstractmethod
    def someAbstractMethod(self):
        raise NotImplementedError("Not implemented yet.")


class Subclass(Base):
    def someAbstractMethod(self):
        some_operations

objects = [Base(),Subclass(),Base(),Subclass(),Subclass(),...]
for object in objects:
    #here I want check if method is still abstract or not