class B:
        def __init__(self):
            self.count= 1

        def setCount(self,count):
            self.count+=count

    class A:
        def __init__(self):
            self.b = B

        def inc(self):
            self.b.setCount(20)
    if __name__ == "__main__":
        a = A
        a.inc()

class B:
    def __init__(self):
        self.count = 1

    def setCount(self, count):
        self.count += count


class A:
    def __init__(self, obj):
        self.b = obj

    def inc(self):
        self.b.setCount(20)


if __name__ == "__main__":
    b = B()
    a = A(b)
    a.inc()
    print(b.count)