inheritance.py

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

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

    def perimeter(self):
        return 2 * self.length + 2 * self.width


class Square(Rectangle):
    def __init__(self, length):
        super(Square, self).__init__(length, length)


class Triangle:
    def __init__(self, base, height):
        self.base = base
        self.height = height

    def area(self):
        return 0.5 * self.base * self.height


class RightPyramid(Triangle, Square):
    def __init__(self, base, slant_height):
        self.base = base
        self.slant_height = slant_height
        super(Square, self).__init__(base, base)

    def area(self):
        base_area = super(Square, self).area()
        perimeter = super().perimeter()
        return 0.5 * perimeter * self.slant_height + base_area


pyramid = RightPyramid(2, 4)
print(pyramid.area())