abstract_factory

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# vim:set shiftwidth=2 tabstop=2 expandtab textwidth=79:

import random

class PetShop(object):
  def __init__(self, animal_factory=None):
    self.pet_factory = animal_factory

  def show_pet(self):
    pet = self.pet_factory.get_pet()
    print 'we hava a lovely {}'.format(pet)
    print 'It says {}'.format(pet.speak())
    print 'We also hava {}'.format(self.pet_factory.get_food())


class Dog(object):
  def speak(self):
    return 'woof'

  def __str__(self):
    return 'Dog'


class Cat(object):
  def speak(self):
    return 'meow'

  def __str__(self):
    return 'Cat'


class DogFactory(object):
  def get_pet(self):
    return Dog()

  def get_food(self):
    return 'dog food'


class CatFactory(object):
  def get_pet(self):
    return Cat()

  def get_food(self):
    return 'cat food'


def get_factory():
  return random.choice([DogFactory, CatFactory])()


for i in range(3):
  shop = PetShop(get_factory())
  shop.show_pet()
  print '=' * 20

参考：

1、https://github.com/faif/python-patterns/blob/master/abstract_factory.py

2、http://blog.youkuaiyun.com/zhengzhb/article/details/7359385