#!/usr/bin/env python
#coding=utf-8
# 
# 工厂模式一例
# 版权所有 2014 yao_yu (http://blog.csdn.net/yao_yu_126)
# 本代码以MIT许可协议发布
# 2014-04-22
# 

class Cube(object):
    pass

class Cuboid(object):
    pass
    
class Cylinder(object):
    pass

class Sphere(object):
    pass

class ObjectFactory(dict):
    def register(self, klass):
        klass_name = klass.__name__
        if klass_name not in self:
            self[klass_name] = klass
    def create(self, klass_name):
        if klass_name in self:
            return self[klass_name]

object_factory = ObjectFactory()
for klass in (Cube, Cuboid, Cylinder, Sphere):
    object_factory.register(klass)

if __name__ == '__main__':
    def main():
        for klass in (Cube, Cuboid, Cylinder, Sphere):
            obj = object_factory.create(klass.__name__)()
            print(obj.__class__.__name__)
    
    main()

输出结果

Cube
Cuboid
Cylinder
Sphere