Скачать или смотреть Transforming Functions into Class Methods with Python Decorators

Learn how to use `Python` decorators to turn regular functions into class methods and instance methods seamlessly.
---
This video is based on the question https://stackoverflow.com/q/67284576/ asked by the user 'koliber' ( https://stackoverflow.com/u/15776895/ ) and on the answer https://stackoverflow.com/a/67285390/ provided by the user 'ekon' ( https://stackoverflow.com/u/11179620/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Python: How can i decorate function to change it into class method

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Transforming Functions into Class Methods with Python Decorators

In the world of Python, decorators are powerful tools that allow you to modify the behavior of functions or methods elegantly and succinctly. One common problem developers encounter is the need to decorate a function such that it becomes a class method or an instance method. This guide will walk you through the process of creating decorators that accomplish this.

The Problem: Decorating Functions

You might have a standalone function that you want to easily attach as a method of a class. For example, you want to declare a function foo to be a class method of class A, and another function bar to be an instance method. Here’s the initial setup:

[[See Video to Reveal this Text or Code Snippet]]

This concept raises two key questions:

How can we turn foo into a class method of A?

How can we turn bar into an instance method of A?

Fortunately, the solution lies in Python decorators.

The Solution: Creating Decorators

Step 1: Decorator for Class Methods

To add the functionality of a class method, we need to create a decorator called add_class_method. This decorator will:

Wrap the original function

Use setattr to attach this function to the class as a class method

Here is how you can implement it:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Decorator for Instance Methods

Next, we need to create a similar decorator for instance methods. This is quite straightforward. The main difference is that when decorating an instance method, we simply set the function directly on the class without converting it to a class method:

[[See Video to Reveal this Text or Code Snippet]]

Putting It All Together

By integrating both decorators into your code, you will be able to decorate the functions foo and bar to turn them into class methods and instance methods of class A respectively. Here’s the complete code:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Using decorators to modify functions is a powerful feature in Python that promotes clean and maintainable code. With add_class_method and add_instance_method, you can enhance the capabilities of your classes easily.

Key Takeaways:

Decorators can be used to modify functions effortlessly.

You can attach functions as class methods and instance methods using setattr.

Understanding decorators enhances your proficiency in writing Pythonic code.

Now you have the tools to transform functions into class methods with ease! Happy decorating!