class Shape:
    squs = []
    def __init__(self, w, h):
        self.width = w
        self.height = h
        self.squs = squs

class Square(Shape):
    def go_list(self):
        super().__init__(self)
        return self.squs.append(self.width)

S1 = Square(20, 20)
print(s1.go_list())
S2 = Square(10, 10)
print(s2.go_list())