Decorator Designs
This simple class, MyClass defines two methods: my_static_method and my_instance_method. It is clear which method is the static method without even looking at the names. The classmethod decorator is not only a fundamental piece of object-oriented software design, but also to the Python programming language. The fact that there is no decorator definition to look up is also indicative of its simplicity. So what about a more complex decorator?
The purpose of a decorator is to transform a function or method. The decorator takes the original, and returns a new, function or method. Before the modified method is returned, it needs to do something to it. Otherwise, the decorator is completely pointless. In the case of the classmethod decorator, it transforms an otherwise instance-level method into one that applies to every instance of the same type. This decorator doesn't take the method signature into account. The classmethod decorator will work regardless of the number of parameters in the decorated method. More complex decorators will require specific parameters in the decorated method's signature. Consider a method with functionality that requires an authenticated session be established before executing. An obvious domain here would be a web application. More specifically, an instance method that is exposed as a web controller. The logical use of a decorator with these methods would be to make sure that the invocation request is authenticated. The fact that a given web application is likely to contain several of these methods that serve as web controllers makes the use of an authentication decorator even more attractive. This is in fact a good use of a decorator. The responsibility of making sure the method is allowed to execute is taken away from the method. This is great if it meshes well with the design. Here is an example of an authentication controller.
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