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The Decorator Pattern
The Decorator pattern provides us with a way to modify the behavior of individual objects without having to create a new derived class. Suppose that we have a program that uses eight objects, but three of them need an additional feature. You could create a derived class for each of these objects, and in many cases, this would be a perfectly acceptable solution. However, if each of these three objects requires different features, this would mean creating three derived classes. Further, if one of the classes has features of both the other classes, you would begin to create complexity that is both confusing and unnecessary.
Decorators can be used on visual objects such as buttons, but Python has a rich suite of nonvisual ...
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