Why the attribute didn't inherited after I called super(…) on the subclass?

Question

I'm trying to get a class attribute from the subclass. The attribute is assigned to the value on the superclass initialization. See:

class A:
    _b = None
    def __init__(self, a, b):
        self.a = a
        _b = b

class B(A):
    def __init__(self, a, b):
        super(B,self).__init__(a=a, b=b)
        print('Try to get _b value:', self._b)

B(4,5)

On initialization of class B, super(...). init is called so the constructor of A class should be called. This results in b of being assigned to A._b. However, when I try to get self._b from class B, it seems like it doesn't initialize A because self._b is equal None.

Answer 1

Your A.__init__ doesn't initialize self._b , it initializes a local variable called _b . Since this is a local variable it disappears as soon as that function returns.