Скачать или смотреть How to Call a ClassMethod from a StaticMethod in Python

Discover the best practices for calling a `ClassMethod` from a `StaticMethod` in Python, including tips and common pitfalls.
---
This video is based on the question https://stackoverflow.com/q/67700344/ asked by the user 'Achal Sharma' ( https://stackoverflow.com/u/9967379/ ) and on the answer https://stackoverflow.com/a/67700466/ provided by the user 'Vedant Matanhelia' ( https://stackoverflow.com/u/14201573/ ) 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 to call ClassMethod from StaticMethod

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 Call a ClassMethod from a StaticMethod in Python

If you're working on a Python project, you may have found yourself needing to call a ClassMethod from a StaticMethod. This is a common scenario that can be a little tricky for those new to Python. In this post, we'll break down how to achieve this and discuss best practices for using ClassMethods and StaticMethods effectively.

Understanding Static and Class Methods

Before we delve into the solution, let's clarify the roles of StaticMethods and ClassMethods in Python.

Static Methods: These are methods that belong to the class rather than any specific instance. They do not access or modify class or instance state. Static methods are defined using the @ staticmethod decorator.

Class Methods: Unlike static methods, class methods can access and modify class state. They are defined using the @ classmethod decorator and have access to the class itself through the first argument, conventionally named cls.

The Problem

In your case, you attempted to call a ClassMethod from within a StaticMethod. Your initial attempt might have looked something like this:

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

This code does not work as intended because staticm does not inherently have access to the classm method. Instead, you need to explicitly reference the class when calling a class method from a static method.

The Solution

To properly call a ClassMethod from a StaticMethod, follow these steps:

Step 1: Change self to cls in Class Methods

It's best practice to use cls instead of self in class methods. This helps avoid confusion, as self typically refers to instance methods. Here's how you can implement this:

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

Step 2: Call ClassMethod from StaticMethod

In the body of your static method, reference the ClassMethod using the class name. Here's how to do this correctly:

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

Explanation of the Code

Class Definition: We define a class ABC with both a class method classm and a static method staticm.

Method Implementation: Inside classm, we print the name we pass. In staticm, we call ABC.classm(freq), passing the argument freq to the class method.

Testing the Code: When we create an instance of ABC and call staticm, it successfully calls classm, demonstrating the desired functionality.

Conclusion

In summary, calling a ClassMethod from a StaticMethod in Python requires a little understanding of how each method type functions. By following the above steps and using best practices such as naming conventions, you can successfully manage the interplay between these methods.

If you find yourself unsure or needing help, don't hesitate to reach out to the community or refer to Python’s extensive documentation. Happy coding!