Quick Answer
Metaclass is the class of a class - controls how classes are created. Default metaclass is type. Custom metaclass: class MyMeta(type): override __new__ or __init__. Use class MyClass(metaclass=MyMeta). Use cases: ORM field registration (Django models), API validation, singleton enforcement, automatic method registration. Metaclasses are powerful but complex - often a class decorator or __init_subclass__ is simpler.
Answer
Metaclass is the class of a class. Defines how classes are created. Useful for validation, auto-registration, or enforcing patterns. Custom metaclasses extend type.
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Verified Answer
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