Python design mode-Template method mode

1. Template Method mode

To do a problem:

Requirement: There are two students to answer questions and write their own answers

#Encoding=utf-8__author__='[email protected]'classStudenta ():defAnswer1 (self):Print 'topic One: XXXXXX'        Print 'my answer is: B'    defAnswer2 (self):Print 'topic One: XXXXXX'        Print 'my answer is: B'classstudentb ():defAnswer1 (self):Print 'topic One: XXXXXX'        Print 'my answer is: C'    defAnswer2 (self):Print 'topic One: XXXXXX'        Print 'my answer is: D'if __name__=='__main__': Student_a=Studenta () student_a.answer1 () Student_a.answer2 () student_b=studentb () student_b.answer1 () Student_b.answer2 ( )

This writing is sure to repeat too many things, such as writing a topic, such as "My answer is" and so on, if we need to create a lot of studentx class, in case one day need to change the topic, we have to change a lot of things,

So the purpose of the template method mode is that all the repetition of things, that need to write more than two times in a template (can be a parent class, can also be a function)

The implementation of the template method:

#Encoding=utf-8__author__='[email protected]'classStudent ():defAnswer1 (self):Print 'topic One: XXXXXX'        Print 'My answer is:%s'%Self.get_answer1 ()defGet_answer1 (self):return 'A'    defAnswer2 (self):Print 'topic One: XXXXXX'        Print 'My answer is:%s'%Self.get_answer2 ()defGet_answer2 (self):return 'A'classStudenta ():defGet_answer1 (self):return 'B'    defGet_answer2 (self):return 'B'classstudentb ():defAnswer1 (self):return 'C'    defAnswer2 (self):return 'D'if __name__=='__main__': Student_a=Studenta () student_a.answer1 () Student_a.answer2 () student_b=studentb () student_b.answer1 () Student_b.answer2 ( )

One technique used here is that you can define a common method in the parent class, and then the subclass overrides this method to implement the differentiation between subclasses.

Python design mode-Template method mode