Exercises in Programming Style

Chapter 32

Trinity

32.1 Constraints

• The application is divided into three parts: the model, the view and the controller:
  • the model represents the application's data;
  • the view represents a specific rendition of the data;
  • the controller provides for input controls, for populating/updating the model and for invoking the right view.
• All application entities are associated with of one of these three parts. There should be no overlap of responsibilities.

32.2 A Program in this Style

  1 #!/usr/bin/env python
  2 import sys, re, operator, collections
  3
  4 class WordFrequenciesModel:
  5 """ Models the data. In this case, we're only interested
  6 in words ...