Python Programming with Design Patterns

13

The Bridge Pattern

At first sight, the Bridge pattern looks much like the Adapter pattern in that a class is used to convert one kind of interface to another. However, the intent of the Adapter pattern is to make one or more classes’ interfaces look the same as the interface of a particular class. The Bridge pattern is designed to separate a class’s interface from its implementation so that you can vary or replace the implementation without changing the client code.

Suppose that we have a program that displays a list of products in a window. The simplest interface for that display is a simple Listbox. But after a significant number of products have been sold, we may want to display the products in a table along with their sales figures.