class Vehicle(object):
    def __init__(self, name, speed):
        self.name = name
        self.speed = speed


class PassengerCar(Vehicle):
    def __init__(self, name, speed, doors):
        super(PassengerCar, self).__init__(name, speed)
        self.doors = doors

x = PassengerCar('usun', 15, 'kont')

print x.__dict__