Скачать или смотреть How to Create Dynamic Methods in Python Classes

Discover how to define methods outside of a Python class and integrate them dynamically while utilizing class self variables.
---
This video is based on the question https://stackoverflow.com/q/68493263/ asked by the user 'jfcabreras' ( https://stackoverflow.com/u/16055800/ ) and on the answer https://stackoverflow.com/a/68493345/ provided by the user 'pppig' ( https://stackoverflow.com/u/12353978/ ) 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: Create method with class self variables outside of a python class and then add it as a method to 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 Create Dynamic Methods in Python Classes

In Python programming, it’s common to extend the functionality of classes by introducing methods. However, there are times when you may want to define methods outside of the class structure, especially if you want to allow users to customize behavior dynamically. In this guide, we'll explore how to create methods outside a class and how to seamlessly integrate them with class self variables.

The Problem

Imagine you have a class with several variables, and you would like to allow users to choose which method to run based on their input. The goal is to define these methods outside of the class and still have access to the instance's variables when they are called.

Let’s take a look at the setup:

You want to allow users to select between two different methods.

Each of these methods operates on the internal variables of the class.

You’ll need to ensure that the instance variables are passed correctly to the external methods.

Solution Overview

Here's how we can accomplish this with a couple of approaches:

Example 1: Using Self in the Method

In this method, we define the external method (outside_method) with self as the argument, allowing it to access instance variables directly.

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

Example 2: Passing Variables Directly

If you prefer not to use the self reference in the external method, you can define the method to take parameters directly. Here’s how this can be done:

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

Running the Code

Based on the input:

If the user enters 1, the output will be the sum of var1 and var2.

If the user enters 2, the output will be the result of the expression (var1 - var2) * varx.

This approach allows for flexibility and customization in how methods are defined and executed, giving users the power to modify behavior without altering the core class structure.

Conclusion

In this guide, we've successfully demonstrated how to create dynamic methods in Python classes that can be defined outside of the class while still accessing and manipulating instance variables. This technique adds a layer of flexibility, allowing users to customize class behavior effectively.

Feel free to adapt this method to your own projects and enjoy the power of dynamic programming in Python!