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Learn Python Unpack to type **kwargs with TypedDict, expand variadic tuples, and preserve precise callable signatures.

Learn Python Required and NotRequired to control mandatory and optional TypedDict keys without confusing absence with None.

Learn Python ReadOnly to protect TypedDict fields, model stable response contracts, and prevent accidental writes during static analysis.

Learn Python TypeAliasType to create explicit aliases, inspect them at runtime, and model reusable generic APIs safely.

Learn Python overload for precise signatures with Literal, None, generics, methods, and return types that depend on arguments.

Learn Python ClassVar to separate class and instance state in dataclasses, registries, caches, inheritance, and counters.

Learn Python Final and @final to protect constants, attributes, methods, and classes while understanding runtime limitations.

Learn Python Annotated to attach metadata to types for validation, schemas, units, documentation, and framework integration.