gistfile1.py

# pizza.py

class DoughFactory(object):

	def get_dough(self):
		return 'insecticide treated wheat dough'

class Pizza(DoughFactory):

	def order_pizza(self, *toppings):
		print('Getting dough')
		dough = super().get_dough()
		print('Making pie with %s' % dough)
		for topping in toppings:
			print('Adding: %s' % topping)

if __name__ == '__main__':
	Pizza().order_pizza('Pepperoni', 'Bell Pepper')

# better_pizza.py

from pizza import Pizza, DoughFactory

class OrganicDoughFactory(DoughFactory):

	def get_dough(self):
		return 'pure untreated wheat dough'

class OrganicPizza(Pizza, OrganicDoughFactory):
	pass

if __name__ == '__main__':
	OrganicPizza().order_pizza('Sausage', 'Mushroom')