Type Hints and Modern Python
Describe contracts with annotations, check them with mypy, and use dataclasses and protocols to make data-heavy code easier to change.
Functions, classes, and basic Python syntax.
Add type hints to functions and classes, use mypy for static type checking, and apply dataclasses for clean data models with type safety.
Read in order, or jump to what you need.
Every lesson builds on the one before it. Open any lesson to read the explanation, run the examples, and try the practice challenges.
- 07.01Introduction to Type Hints4 min
Add annotations that document real contracts, run a static checker, and model records with dataclasses.
- 07.02Advanced Type Hints4 min
Use generics, protocols, literals, and strict checking to describe behavior that ordinary annotations cannot capture.
- 07.03Project: A Typed Data Model LibraryProject4 min
Build a small order library with frozen dataclasses, exact money, a Protocol discount boundary, and a green mypy --strict run.
Ready to move on?
Add type hints to a module, run mypy in strict mode, and fix all type errors without changing runtime behavior.
Open the module self-check