pythonj dziedziczenie

import math;

class Punkt:
    def __init__(self,x=None,y=None):

            self.x=int(input("podaj x")) if(x is None) else x
            self.y = int(input("podaj y")) if(y is None) else y



    def wyswietl(self):
        print(self.x, ";", self.y, ";", self.z)
    def do_zera(self):
        c=math.sqrt(self.x*self.x+self.y*self.y)
        print("odelglosc od srodka wynosi:",c)
    def move(self,x2,y2):
        self.x+=x2;
        self.y+=y2;
    def move_to(self,x2,y2):
        self.x=x2;
        self.y=y2;
    def odleglosc_od(self,x2,y2):
        dx = self.x - x2
        dy = self.y - y2
        dl = math.sqrt(dx * dx + dy * dy)
        print("odelglosc wynosi ", dl)

class punkt3d(Punkt):
    def __init__(self,x=None,y=None,z=None):
        self.z=int(input("podaj z")) if(z is None) else z;
        super().__init__(x,y)



def main():
    '''p1= Punkt(1,2)
    print(p1.x," ", p1.y)
    p2= Punkt(1)
    print(p2.x," ", p2.y)'''

    p3=punkt3d();
    print(p3.x, " ", p3.y, " ", p3.z)
    p4 = punkt3d(1);
    print(p4.x, " ", p4.y, " ", p4.z)
    p5 = punkt3d(1,2);
    print(p5.x, " ", p5.y, " ", p5.z)
    p6 = punkt3d(1,2,3);
    print(p6.x, " ", p6.y, " ", p6.z)



main()