Practice · 2 of 3
Auto-registering subclasses
CHALLENGE
Difficulty: advanced+25 XP
Implement class Registered whose subclasses are collected automatically:
- use __init_subclass__ (no metaclass)
- each subclass registers itself in Registered.registry (a dict) keyed by a class attribute key if present, else its lowercase class name
- the base class itself must NOT appear in the registry
- Registered.get(key) returns the class or raises KeyError
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