設計模式之python版（五）–Factory 方法

Factory 方法

應用特性：需要產生的對象經常需要增改時，抽離出易變的內容並獨立放置在一個類中

結構特性：一個工廠類分離成多個子工廠類，分別只做一件事

UML：

#!/usr/bin/env python  #encoding: utf-8    class factory_base:    def __init__(self):        pass        def create_method(self):          pass     class factory1(factory_base):    def __init__(self):        pass            def create_method(self):          return class1()class factory2(factory_base):    def __init__(self):        pass        def create_method(self):        return class2()        class class_base:    def __init__(self):        pass         def do_something(self, something):        pass           class class1(class_base):    def __init__(self):        pass        def do_something(self, something):        print something        class class2(class_base):    def __init__(self):        pass        def do_something(self, something):        print something + ' WITH ' + something              if '__main__' == __name__:      factory1_obj = factory1()    factory2_obj = factory2()    class1_obj = factory1_obj.create_method()    class2_obj = factory2_obj.create_method()       class1_obj.do_something('something')    class2_obj.do_something('something')        print factory1_obj.__class__     print factory2_obj.__class__        print class1_obj.__class__     print class2_obj.__class__    

結果：

somethingsomething WITH something__main__.factory1__main__.factory2__main__.class1__main__.class2