these files are used for creating mvc style professional code from simple class in python language.

written in easy to understand way. just save these files into your project folder ,

either overwrite model view controller files or create subclasses and extend those classes

   it a way of writing code .it is a way  to create a professional or 
   easly maintainable and easy to understand code 
   we should seperate code into 3 things.called model view and controller.
   
   it means
   
      * we must start execution from controller. 
      * controller will start graphical user interface (view functions)
      * it will also start core backend code ( model functions).
      * we should not call model functions from view and we should not call view functions from model. 
      * controller can call view and model functions. so they can communicate
   
   if you implemented this basic code then it automaticaly becomes a professional code

   mvc.py  
      it contain starting point .the main code
   
   model.py
    contain backend code or code which uses lowlevel api .
   
   view.py
      contains graphical user interface
   
   controller.py
      it contain code responsible for managing model and view.