from math import pi

class FiguraGeometrica:
    def area(self):
        raise NotImplementedError('metodo area non implementato')
    def perimetro(self):
        raise NotImplementedError('metodo perimetro non implementato')
    def __str__(self):
        return "Figura geometrica generica"
    


if __name__== '__main__':
    import sys
    try:
        listafigure = [FiguraGeometrica(),
                   Cerchio(1.0),
                   Quadrato(1.0),
                   Rettangolo(1.0,2.0)]
    except Exception as err:
        print(err)
        sys.exit(1)
        

    for f in listafigure:
        print('-'*20)
        print(f)
        try:
            f.area()
            f.perimetro()
        except Exception as err:
            print(err)