Big talk involves pattern Python implementation-factory method mode

Tag: Performer implements coding factory encapsulated object Border connection Ges use

Factory method Pattern (Factory mode): Defines an interface for creating objects, so that subclasses decide which class to instantiate, and the factory method delays the instantiation of a class to its subclasses.

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 4 __author__='Andy'5 6 """7 Liar design Mode8 design mode-factory method mode9 Factory method Pattern (Factory mode): Defines an interface for creating objects, so that subclasses decide which class to instantiate, and the factory method delays the instantiation of a class to its subclasses.Ten The factory method mode overcomes the shortcomings of the simple Factory mode against the open-closed principle, and preserves the advantages of the encapsulation object creation process . One scene: Lei Feng factory, do not care about the performers, only care about the results of implementation A """ -  - classLeifeng (object): the  -     defSweep (self): -         Print "sweeping" -  +     defWash (self): -         Print "Laundry" +  A     defBuyrice (self): at         Print "Buy Rice" -  -  - classifactory (Leifeng): -  -     defCreateleifeng (self): in         Pass -  to #College students + classUndergraduate (Leifeng): -     Pass the  * #New community service providers $ classVolunteer (Leifeng):Panax Notoginseng     Pass -  the #study of Lei Feng's University student factory + classundergraduatefactory (ifactory): A  the     defCreateleifeng (self): +         returnUndergraduate () -  $ #Add a new community service factory e $ classvolunteerfactory (ifactory): -  -     defCreateleifeng (self): the         returnVolunteer () - Wuyi  the if __name__=="__main__": -Student =undergraduatefactory () WuVolunteer =volunteerfactory () - student. Buyrice () About student. Sweep () $Volunteer. Wash ()

The design of the above class is as follows:

Create an abstract factory class Createleifeng and an abstract object class Leifeng, when creating a concrete Leifeng object-undergradiate go to DoSomething, Use the Undergraduatefactory factory class that inherits the abstract factory, which returns a Undergradiate instance, and if you want to do another dosomething, Create a volunteerfactory factory method to create a volunteer instance.

Andy
Source: http://www.cnblogs.com/onepiece-andy/
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Big talk involves pattern Python implementation-factory method mode