In this tutorial, you'll preview the new static typing features in Python 3.12. You'll learn about the new syntax for type variables, making generics simpler to define. You'll also see how @override lets you model inheritance and how you use typed dictionaries to annotate variable keyword arguments.

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Real Python

Python 3.12 introduces improvements to static typing, including a new syntax for type variables and the ability to annotate **kwargs more precisely using typed dictionaries. The core features of Python's support for static typing include the use of type variables, which have been a part of Python since version 3.5. The new syntax in Python 3.12 simplifies the typing of generics. Typed dictionaries can now be used to annotate **kwargs, allowing for more precise type hints for different keyword arguments.

Python 3.12 Preview: Static Typing Improvements – Real Python

Recap Type Variable Syntax Before Python 3.12

Explore Python 3.12’s New Syntax for Typing Generics