factory.py

class Pizza(object):
    def __init__(self):
        self._price = None

    def get_price(self):
        return self._price

class HamAndMushroomPizza(Pizza):
    def __init__(self):
        self._price = 8.5

class DeluxePizza(Pizza):
    def __init__(self):
        self._price = 10.5

class HawaiianPizza(Pizza):
    def __init__(self):
        self._price = 11.5

class PizzaFactory(object):
    @staticmethod
    def create_pizza(pizza_type):
        if pizza_type == 'HamMushroom':
            return HamAndMushroomPizza()
        elif pizza_type == 'Deluxe':
            return DeluxePizza()
        elif pizza_type == 'Hawaiian':
            return HawaiianPizza()

if __name__ == '__main__':
    for pizza_type in ('HamMushroom', 'Deluxe', 'Hawaiian'):
          print('Price of {0} is {1}'.format(pizza_type, PizzaFactory.create_pizza(pizza_type).get_price()))