Every Friday, you'll get a recap of the most important and exciting Python and coding news. The Friday Loop also keeps everyone posted on new ArjanCodes courses and any limited offers coming up.
DeepSeek Won't Matter for Software Engineers | Issue #38
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​The Friday Loop
Every Friday, you'll get a recap of the most important and exciting Python and coding news. The Friday Loop also keeps everyone posted on new ArjanCodes courses and any limited offers coming up.
Have you ever hesitated between writing a method or a property, and then just picked one because “it felt right”? That small choice actually carries a lot of design weight. In this week’s video, I explore when properties make sense and when methods are the better choice. I talk about what properties promise to the reader of your code, why setters should be used carefully, how this choice affects abstractions and Protocols, and where async fits into all of this. This video is also a good...
Most systems don’t start out needing CQRS. They start simple: create, update, list, dashboard. Everything in one place. Everything reasonable. Until read requirements slowly begin to reshape the system, often in subtle ways 🧩. In this week’s video, I show how that happens using a FastAPI app backed by MongoDB, and how Command Query Responsibility Segregation (CQRS) provides a clean way out once reads and writes want very different things. Along the way, I cover: separating command intent from...
Code can be correct and still be unpleasant to read. A lot of software design isn’t about what the code does but about how clearly it communicates the sequence of ideas behind it. In this week’s video, I explore the Fluent Interface pattern by refactoring a small animation engine in Python. I start with a clunky but functional API, then gradually reshape it until defining an animation reads almost like a sentence: move, rotate, scale, fade. Enjoy this deep dive into API design, readability,...