Your Classes Have a Class... Python Metaclasses Explained | type() & __init_subclass__ | Ep 28

Veröffentlicht am: 16 Juni 2026
auf dem Kanal: CodeToAGI

Did you know that when you write "class Dog: pass", Python doesn't actually call Dog()?

It secretly calls type('Dog', (object,), {...}) — and you can hijack this process with metaclasses.

In this episode you’ll discover:
✅ Why type(Dog) returns class 'type'
✅ How to create classes dynamically with type(name, bases, dict)
✅ Building a custom metaclass that rewrites class behavior
✅ The exact 5-step class creation pipeline (visualized)
✅ _init_subclass_ — 90% of metaclass power with almost zero complexity
✅ When to use metaclasses vs _init_subclass_ (simple decision rule)
✅ Mini-project: Auto-validating ORM base class using only these tools

Perfect for intermediate+ Python developers who want to understand what’s really happening under the hood.

⏱ CHAPTERS:
0:00 Intro — Your classes have a class
0:30 type() — The metaclass behind every class
2:00 type(name, bases, dict) — Dynamic class creation
3:30 Writing a custom metaclass (UpperMeta)
5:00 The 5-step class creation pipeline
6:30 _init_subclass_ — Plugin registry pattern
7:30 Metaclass vs _init_subclass_ — When to use which
8:30 Mini-project — Auto-validating ORM base class
10:00 Challenge + Summary

💬 Drop your SingletonMeta or auto-validating User model in the comments — I reply to every single one!

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#Python #Metaclasses

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