--- title: Learn Computing from the Experts | The Rheinwerk Computing Blog (8) description: Dive into programming, web development, and more with Rheinwerk Computing Blog! Your go-to resource for expanding your computing knowledge. (8) --- [![Rheinwerk Computing Logo](https://blog.rheinwerk-computing.com/hubfs/computing_logo-header.svg)](https://blog.rheinwerk-computing.com/) [Blog](https://blog.rheinwerk-computing.com) - Books - Get an overview of our wide selection of books on every relevant computing topic. - [General Computing](https://www.sap-press.com/rheinwerk-computing/general-computing/) - [DevOps](https://www.sap-press.com/rheinwerk-computing/devops/) - [Programming Languages](https://www.sap-press.com/rheinwerk-computing/programming-languages/) - [Security](https://www.sap-press.com/rheinwerk-computing/security/) - [Software Development](https://www.sap-press.com/rheinwerk-computing/software-development/) - Book Subscription - Get unlimited access to all Rheinwerk Computing books! - [Programming Subscription](https://sap-press.com/subscriptions/) ![](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Write%20Your%20Own%20Python%20Functions.jpg?width=1000&name=How%20to%20Write%20Your%20Own%20Python%20Functions.jpg) [Featured](https://blog.rheinwerk-computing.com/tag/featured) | Featured article ## [How to Write Your Own Python Functions](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) Functions in Python provide functionality that you or someone else has already pro­grammed. In this post, we’ll teach you how to write your own Python functions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) # Latest Blog Posts [![AI-Supported Test Automation for Programming](https://blog.rheinwerk-computing.com/hs-fs/hubfs/AI-Supported%20Test%20Automation%20for%20Programming.jpg?height=600&name=AI-Supported%20Test%20Automation%20for%20Programming.jpg)](https://blog.rheinwerk-computing.com/ai-supported-test-automation-for-programming) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [AI-Supported Test Automation for Programming](https://blog.rheinwerk-computing.com/ai-supported-test-automation-for-programming) Manually testing new features is tedious and error-prone—here’s how AI tools like ChatGPT can help automate your testing workflow with clear,... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/ai-supported-test-automation-for-programming) [![How to Conduct a 5-Second Test for UX](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Conduct%20a%205-Second%20Test%20for%20UX.jpg?height=600&name=How%20to%20Conduct%20a%205-Second%20Test%20for%20UX.jpg)](https://blog.rheinwerk-computing.com/how-to-conduct-a-5-second-test-for-ux) [User Experience](https://blog.rheinwerk-computing.com/tag/user-experience) ## [How to Conduct a 5-Second Test for UX](https://blog.rheinwerk-computing.com/how-to-conduct-a-5-second-test-for-ux) The 5-second test is a method that comes from marketing and is designed to measure the user’s evaluation of a product, advertisement, or website... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-conduct-a-5-second-test-for-ux) [![Best Practices for Preventing SQL Injection in PHP](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Best%20Practices%20for%20Preventing%20SQL%20Injection%20in%20PHP.jpg?height=600&name=Best%20Practices%20for%20Preventing%20SQL%20Injection%20in%20PHP.jpg)](https://blog.rheinwerk-computing.com/preventing-sql-injection-in-php) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [Best Practices for Preventing SQL Injection in PHP](https://blog.rheinwerk-computing.com/preventing-sql-injection-in-php) When users fill out forms on your website—like leaving a guestbook entry—it’s easy to assume their input is harmless. But what if someone tries to... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/preventing-sql-injection-in-php) [![What Is Hot Code Swapping in Java?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20Hot%20Code%20Swapping%20in%20Java_.jpg?height=600&name=What%20Is%20Hot%20Code%20Swapping%20in%20Java_.jpg)](https://blog.rheinwerk-computing.com/what-is-hot-code-swapping-in-java) [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) ## [What Is Hot Code Swapping in Java?](https://blog.rheinwerk-computing.com/what-is-hot-code-swapping-in-java) A drawback of Spring application development is that, unlike with an application server, changes made to the source code or bytecode aren’t... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-is-hot-code-swapping-in-java) [![Server Communication in React: Axios vs Fetch API](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Server%20Communication%20in%20React_%20Axios%20vs%20Fetch%20API.jpg?height=600&name=Server%20Communication%20in%20React_%20Axios%20vs%20Fetch%20API.jpg)](https://blog.rheinwerk-computing.com/server-communication-in-react-axios-vs-fetch-api) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [Server Communication in React: Axios vs Fetch API](https://blog.rheinwerk-computing.com/server-communication-in-react-axios-vs-fetch-api) Communicating with a web server is a classic side effect in a React application. For this reason, you place these requests not directly in the... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/server-communication-in-react-axios-vs-fetch-api) [![Git Error Messages (Root Causes and Solutions)](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Git%20Error%20Messages%20(Root%20Causes%20and%20Solutions).jpg?height=600&name=Git%20Error%20Messages%20(Root%20Causes%20and%20Solutions).jpg)](https://blog.rheinwerk-computing.com/git-error-messages-causes-solutions) [DevOps](https://blog.rheinwerk-computing.com/tag/devops) ## [Git Error Messages (Root Causes and Solutions)](https://blog.rheinwerk-computing.com/git-error-messages-causes-solutions) In this blog post, explore the essence of a Git error message, the context where they can occur, and some possible root causes and solutions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/git-error-messages-causes-solutions) [![What Is OpenHands?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20OpenHands.jpg?height=600&name=What%20Is%20OpenHands.jpg)](https://blog.rheinwerk-computing.com/what-is-openhands) [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) ## [What Is OpenHands?](https://blog.rheinwerk-computing.com/what-is-openhands) OpenHands is an open-source AI assistant that goes beyond chat—offering hands-on file access, program compilation, and autonomous project management. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-is-openhands) [![How to Test Dynamic Bindings in Java](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Test%20Dynamic%20Bindings%20in%20Java.png?height=600&name=How%20to%20Test%20Dynamic%20Bindings%20in%20Java.png)](https://blog.rheinwerk-computing.com/how-to-test-dynamic-bindings-in-java) [Java](https://blog.rheinwerk-computing.com/tag/java) ## [How to Test Dynamic Bindings in Java](https://blog.rheinwerk-computing.com/how-to-test-dynamic-bindings-in-java) Dynamic binding in Java can feel like magic—but understanding how it works under the hood is key to mastering object-oriented programming. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-test-dynamic-bindings-in-java) [![Understanding the Match Expression in PHP 8](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Understanding%20the%20Match%20Expression%20in%20PHP%208.jpg?height=600&name=Understanding%20the%20Match%20Expression%20in%20PHP%208.jpg)](https://blog.rheinwerk-computing.com/match-expression-in-php) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [Understanding the Match Expression in PHP 8](https://blog.rheinwerk-computing.com/match-expression-in-php) With the match case distinction, PHP 8 actually brings a comparatively large innovation to basic programming functions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/match-expression-in-php) [![What Are Enums in Rust?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Are%20Enums%20in%20Rust.jpg?height=600&name=What%20Are%20Enums%20in%20Rust.jpg)](https://blog.rheinwerk-computing.com/what-are-enums-in-rust) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [What Are Enums in Rust?](https://blog.rheinwerk-computing.com/what-are-enums-in-rust) Enums are a powerful feature in Rust for defining types that can represent one of several possible variants. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-are-enums-in-rust) - - [1](https://blog.rheinwerk-computing.com/page/1) - [...](https://blog.rheinwerk-computing.com/page/3) - [6](https://blog.rheinwerk-computing.com/page/6) - [7](https://blog.rheinwerk-computing.com/page/7) - [8](https://blog.rheinwerk-computing.com/page/8) - [9](https://blog.rheinwerk-computing.com/page/9) - [10](https://blog.rheinwerk-computing.com/page/10) - [...](https://blog.rheinwerk-computing.com/page/13) - [30](https://blog.rheinwerk-computing.com/page/30) - ### Blog Topics - [All Topics](https://blog.rheinwerk-computing.com) - [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) - [How To](https://blog.rheinwerk-computing.com/tag/how-to) - [DevOps](https://blog.rheinwerk-computing.com/tag/devops) - [Featured](https://blog.rheinwerk-computing.com/tag/featured) - [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) - [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) - [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) - [Artificial Intelligence](https://blog.rheinwerk-computing.com/tag/artificial-intelligence) - [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) - [Software Development](https://blog.rheinwerk-computing.com/tag/software-development) **Subscribe to our blog!**Get notified about future blog updates. - - - ### Most Popular Blog Posts 1. [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) [What Is the Basic Structure of a Python Program?](https://blog.rheinwerk-computing.com/what-is-the-basic-structure-of-a-python-program) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) 2. [HTML & CSS](https://blog.rheinwerk-computing.com/tag/html-css) [Twelve-Factor App Principles for Developers](https://blog.rheinwerk-computing.com/twelve-factor-app-principles-for-developers) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) 3. [Java](https://blog.rheinwerk-computing.com/tag/java) [Elements of the Java Programming Language](https://blog.rheinwerk-computing.com/elements-of-the-java-programming-language) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) 4. [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) [11 Linux Shell Commands for Hacking and Security](https://blog.rheinwerk-computing.com/11-linux-shell-commands-for-hacking-and-security) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) 5. [User Experience](https://blog.rheinwerk-computing.com/tag/user-experience) [How to "Do" UX Design: A Guide to the ISO 9241-210 Standard](https://blog.rheinwerk-computing.com/how-to-do-ux-design-a-guide-to-the-iso-9241-210-standard) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) **Subscribe to our blog!**Get notified about future blog updates. - - - ### The official Rheinwerk Computing Blog Rheinwerk Computing is an imprint of Rheinwerk Publishing and publishes resources that will help you accelerate your computing journey. The Rheinwerk Computing Blog is designed to provide helpful, actionable information on a variety of topics, including programming, administration, security, and analytics! ### Blog Topics - [All Topics](https://blog.rheinwerk-computing.com) - [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) - [How To](https://blog.rheinwerk-computing.com/tag/how-to) - [DevOps](https://blog.rheinwerk-computing.com/tag/devops) - [Featured](https://blog.rheinwerk-computing.com/tag/featured) - [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) - [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) - [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) - [Artificial Intelligence](https://blog.rheinwerk-computing.com/tag/artificial-intelligence) - [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) - [Software Development](https://blog.rheinwerk-computing.com/tag/software-development) ### Blog curated by [![Rheinwerk Computing Logo](https://blog.rheinwerk-computing.com/hubfs/computing_logo-header.svg)](https://www.sap-press.com/rheinwerk-computing/) [Visit Rheinwerk Computing Store](https://www.sap-press.com/rheinwerk-computing/) ### About - [Home](https://sap-press.com/) - [About Us](https://sap-press.com/the-publisher/) - [Contact](mailto:info@rheinwerk-publishing.com) - [Legal Notes](https://sap-press.com/legal-notes/) - [Privacy Policy](https://sap-press.com/privacy/) - [Terms of Use](https://sap-press.com/terms/) © 2026 Rheinwerk Publishing, Inc. | Change Privacy Options