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The Decorator Pattern (or an implementation of this design pattern in Python - as the above example) should not be confused with Python Decorators, a language feature of Python. They are different things. Second to the Python Wiki: The Decorator Pattern is a pattern described in the Design Patterns Book.
The decorator pattern is a design pattern used in statically-typed object-oriented programming languages to allow functionality to be added to objects at run time; Python decorators add functionality to functions and methods at definition time, and thus are a higher-level construct than decorator-pattern classes.
Decorator: Attach additional responsibilities to an object dynamically keeping the same interface. Decorators provide a flexible alternative to subclassing for extending functionality. Yes Yes Yes Delegation: Extend a class by composition instead of subclassing. The object handles a request by delegating to a second object (the delegate) Yes ...
Decorator can refer to: A house painter and decorator; Interior design; Decorator pattern in object-oriented programming; Function decorators, in Python; The Decorator, a 1920 film starring Oliver Hardy
Python decorator syntax is often used to replace a function with the result of passing that function through a higher-order function. E.g., the function g could be implemented equivalently: >>> @twice ...
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