Type Hints

IntermediateEngineering

Generics, Optional/Union, Protocols, TypedDict, overloads, ParamSpec, type guards, and mypy/pyright in CI.

18 lessons 4 labs 1 projects ~9h

Prerequisites: Object-Oriented Programming

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Lessons in this build

Protocols & Structural Typing

A Protocol defines an interface by the methods and attributes a type must have, so any class that structurally matches is accepted by a type checker — duck typing, verified statically, without inheritance.

Why it matters

Interview importance 4/5 · production importance 5/5.

Recommended next

Protocols & Structural Typing