The State Pattern Done the Pythonic Way
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The classic State design pattern is often implemented with many small classes and heavy inheritance. In this video, I show a different approach.
I start with the traditional object-oriented version and then refactor it into a generic, data-driven state machine using Python features like decorators, enums, and generics. The result is a clean, reusable engine where transitions are explicit and easy to understand.
🔥 GitHub Repository: https://git.arjan.codes/2026/state.
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🔖 Chapters:
0:00 Intro
3:24 Why This Matters
4:11 Step 1 — The Traditional Class-Based State Pattern
4:57 Step 2 — Realization: This Is Just a Lookup Table
5:21 Step 3 — Extracting a Generic StateMachine
17:35 Step 4 — Making Transitions Declarative with a Decorator
20:37 Step 5 — Supporting Multiple From States
24:05 The Payment Class Becomes Boring (In a Good Way)
25:30 When To Use This vs Classic OO
25:54 Final Thoughts
#arjancodes #softwaredesign #python
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