class Rectangle:
    def __init__(self, length, width):
    	self.length = length
		self.width = width

    def area(self):
    	return self.length * self.width


class Square(Rectangle):
    def __init__(self, length):
        # Call the __init__ method of the parent class (Rectangle)
        # super() refers to the parent class of this class
        # Actually using the __init__ method of `Rectangle` here
        #	which needs 2 parameters, `length` and `width`. Since
        #	a square is length==width then we use `length` twice.
    	super().__init__(length, length)


my_square = Square(5)
my_square.area()  # 25