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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.

Learn Python NewType to keep IDs, codes, units, and primitive values distinct, validate boundaries, and prevent domain mix-ups.

Learn Python Never for non-returning functions, unreachable code, and exhaustive unions with assert_never, Literal, Enum, and match.