Master __init_subclass__ for subclass registration, definition-time validation, plugin registries, and keyword arguments in class statements - the Pythonic replacement for most metaclass use cases.
Understand __set_name__, Python's descriptor self-naming protocol - how it eliminates name redundancy, how type.__new__ calls it, and how Django, Pydantic, and SQLAlchemy use it to build self-configuring field systems.
Build a mini SQLAlchemy-style ORM using metaclasses, descriptors, and __set_name__ to map Python classes to database tables.
Master the descriptor protocol - __get__, __set__, __delete__, data vs non-data descriptors, the complete attribute lookup algorithm, and how property, classmethod, staticmethod, and bound methods work under the hood.
Master the type() three-argument form, the full class creation pipeline, code generation with exec and compile, namedtuple internals, __prepare__, and building DSLs that generate Python classes at runtime.
Master Python's import machinery - sys.meta_path finders, loaders, ModuleSpec, lazy imports, AST transformation on import, circular imports, and importlib.metadata for plugin discovery.
Understand type as the metaclass of all classes, the full class creation pipeline, __new__, __init__, __call__ on metaclasses, __prepare__, metaclass inheritance and conflicts, and real-world usage in Django, SQLAlchemy, and ABC.
Master the machinery that powers every serious Python framework - metaclasses, descriptors, __init_subclass__, __set_name__, dynamic class creation, and import hooks. Write code that writes code.
Build an auto-discovering plugin system using __init_subclass__, class registries, and import hooks.
Solve 11 Python __init_subclass__ problems. Covers __init_subclass__ practice, subclass hook. Hints and solutions.
Solve 11 Python __set_name__ problems (3 Easy, 4 Medium, 4 Hard). Practice __set_name__ practice, descriptor naming with hints, runnable code, and solutions.
Solve 11 Python descriptors problems (3 Easy, 4 Medium, 4 Hard). Practice descriptor practice, __get__ __set__ with hints, runnable code, and solutions.
Solve 11 Python dynamic class creation problems. Covers dynamic class, type() exercises, class factory. Hints and solutions.
Solve 11 Python import hooks problems. Covers sys.meta_path exercises, custom finder, import system. Hints and solutions.
Solve 11 Python metaclasses problems. Covers metaclass practice, type() exercises, __new__ problems. Hints and solutions.
