MRO

class C:
    x = 'C'


class A:
    x = 'A'


class B(A, C):
    x = 'B'


print(B().x)


class C1:
    x = 'C1'


class A1:
    @property
    def x(self):
        return 'A1'


class B1(A1, C1):
    x = 'B1'


print(B1().x)