quadrilateral

class Quadrilateral:
    def __init__(self, init_a, init_b, init_c, init_d):
        AT = [int, float]
        if ((type(init_a) not in AT) or
            (type(init_b) not in AT) or
            (type(init_c) not in AT) or
            (type(init_d) not in AT)):
               raise TypeError("Bad type : side of a quadrilateral")

        if ((init_a <= 0 or init_b <= 0 or init_c <= 0 or init_d <= 0) or
            (init_a > init_b + init_c + init_d) or
            (init_b > init_a + init_c + init_d) or
            (init_c > init_a + init_b + init_d) or
            (init_d > init_a + init_b + init_c)):
                raise ValueError("Bad value : side of a quadrilateral")

        self.a = init_a
        self.b = init_b
        self.c = init_c
        self.d = init_d

    def perimeter(self):
        return (self.a + self.b + self.c + self.d)

    def area(self):
        s = self.perimeter() / 2
        return ((s - self.a) * (s - self.b) * (s - self.c) * (s - self.d)) ** 0.5

class Square(Quadrilateral):
    def __init__(self, a):
        Quadrilateral.__init__(self, a, a, a, a)

    def area(self):
        return self.a ** 2 
    
    def get_diagonal(self):
        return self.a * (2 ** 0.5)

    
def main():
    Q = Quadrilateral(14.32, 21.54, 43.21, 17.3)
    P = Q.perimeter()
    A = Q.area()
    print("Perimeter = %.3f Area = %.3f" % (P, A))

    S = Square(10)
    print("Diagonal(S):%.3f" % S.get_diagonal())
    print("Perimeter of S = %.3f Area of S = %.3f" % (S.perimeter(), S.area()))
    
main()