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→ Get started with Hostinger today: http://hostinger.com/arjancodes (make sure to use coupon ARJANCODES). In this video, I refactor a small Python program that looks clean on the surface but hides a messy design underneath. Step by step, I remove unnecessary abstractions and restructure the program around cohesion and clear behavior instead of tiny components. 🔥 GitHub Repository: https://git.arjan.codes/2026/clean. 🎓 ArjanCodes Courses: https://www.arjancodes.com/courses. 💬 Join my Discord server: https://discord.arjan.codes. ⌨️ Keyboard I’m using: https://amzn.to/49YM97v. 🔖 Chapters: 0:00 Intro 0:52 What People Mean by “Clean Code” (And Where It Goes Wrong) 1:27 BEFORE: “Clean” Interface, Messy Reality 3:25 Hostinger Sponsored Integration 4:56 Step 1: Delete the Fake Abstraction and Container 5:54 Step 2: Introduce ReportConfig 10:17 Step 3: Make the Pipeline Explicit: Load → Summarize → Export 13:16 Step 4: Model the Result as a Cohesive Object 18:30 Step 5: Move Business Rules Into One Readable Place (is_valid) 21:31 Show the Final “After” Code (Your Version) 25:13 Reframe “Clean” as Cohesion, Not Smallness 25:52 Final Thoughts #arjancodes #softwaredesign #python