Is there built in method to get all __annotations__ from all base classes in Python?

Question

We have builtin dir() function to get all attributes available for class or instance, defined in based classes.

Is there same for annotations? I'd like to have get_annotations() function, which works like this:

def get_annotations(cls: type): ...  # ?


class Base1:
    foo: float


class Base2:
    bar: int


class A(Base1, Base2):
    baz: str


assert get_annotations(A) == {'foo': float, 'bar': int, 'baz': str}

Answer 1

This should do the trick, right?

def get_annotations(cls: type):
    all_ann = [c.__annotations__ for c in cls.mro()[:-1]]
    all_ann_dict = dict()
    for aa in all_ann[::-1]:
        all_ann_dict.update(**aa) 
return all_ann_dict

get_annotations(A)
# {'bar': int, 'foo': float, 'baz': str}

Or a one-liner version of it:

get_annotations = lambda cls: {k:v for c in A.mro()[:-1][::-1] for k,v in c.__annotations__.items()}

get_annotations(A)
# {'bar': int, 'foo': float, 'baz': str}