Python Class Decorator With Arguments
Decorator with arguments decorator factory example.
Python class decorator with arguments. First you need to understand that the word decorator was used with some trepidation in python because there was concern that it would be completely confused with the decorator pattern from the design patterns bookat one point other terms were considered for the feature but decorator seems to be the one that sticks. The basic python decorator. Function can be assigned to a variable ie they can be referenced. Python functions are first class citizens which means that functions can be treated similar to objects.
So to make a long story short i wanted to make a memoization decorator that took a parameter that set a cache size. Def initself arg1 arg2 arg3. A decorator takes just one argument. Function can be passed as an argument to another function.
One of my favorites is decorators. Instantly share code notes and snippets. Now lets modify the above example to see what happens when we add arguments to the decorator. This section cover the decorator syntax and the concept of a decorator or decorating callable.
And in order to do that i needed to do a little bit of playing around to understand how decorators in python with parameters work. The function to be decorated. This is ideal when you need to extend the functionality of functions. Python is rich with powerful features and expressive syntax.
Heres the most basic syntax for a python decorator. Decorators are a syntactic convenience that allows a python source file to say what it is going to do with the result of a function or a class statement before rather than after the statement. If there are decorator arguments the function to be decorated is not passed to the constructor. In the context of design patterns decorators dynamically alter the functionality of a function method or class without having to directly use subclasses.
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