Скачать или смотреть How to Set a Property of a Class in Python with a Setter Function

Discover a simple and effective way to set properties in a Python class, including the creation of a setter function without compromising access to the class object.
---
This video is based on the question https://stackoverflow.com/q/69020539/ asked by the user 'Qrashi' ( https://stackoverflow.com/u/16808363/ ) and on the answer https://stackoverflow.com/a/69020774/ provided by the user 'Samwise' ( https://stackoverflow.com/u/3799759/ ) 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: Return a way to set a property of a class

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.
---
How to Set a Property of a Class in Python with a Setter Function

When developing classes in Python, you may find yourself needing to manipulate class attributes in a controlled manner. For instance, you might wish to set a specific property of your class without directly exposing the entire object. This ensures that you can manage changes to the properties securely. In this guide, we will explore an efficient method to set a class property using a nested function as a setter.

The Problem

Imagine you have a class Test that has a single boolean attribute called test. You want to control the access to this attribute by creating a function (let's name it test()) that allows you to set the value of test.test, but without exposing the entire Test object.

The initial attempts to achieve this goal might lead to some confusion. For instance, if you try to return the value of test.test directly, any modifications won't be reflected back in the original object.

Here’s the situation:

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

In this code, attempts to change test.test will not work as you don't have a way of referencing it directly.

The Solution: Creating a Setter Function

To set the property, we can use a nested function approach. By defining a setter function inside test(), we can assign a new value to test.test without returning the entire object. Here’s how you can do it:

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

While this code snippet allows you to set the property, it doesn't provide a way to verify if the change was successfully made.

Enhancing the Solution with a Getter Function

To address the limitation of not being able to access the modified property, we can return both a getter and a setter function. This allows you to set the value and also retrieve it afterward:

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

Breakdown of the Enhanced Solution:

Getter Function:

get_test() returns the current value of test.test.

Setter Function:

set_test(val) updates the value of test.test.

Tuple Return:

The test() function now returns a tuple containing both the getter and setter for easy access.

Conclusion

By using this method, you can set and get class properties without directly exposing the class instance. This is a neat and clean way to manage property access, maintaining both encapsulation and usability in your classes.

Now, you have a robust solution to create and manipulate class properties in Python effectively!