What are the best practices for using the Python typing module?

What are the best practices for using the Python typing module?

The best practices include using type hints for function signatures, leveraging the typing extensions, and keeping types simple.

Can you give me an example of type hints in a function?

Sure! Here's a simple example:

def add_numbers(a: int, b: int) -> int:
    return a + b

What are typing extensions and when should I use them?

Typing extensions provide additional features not available in the standard typing module, like Literal and TypedDict. Use them when you need more specific type definitions.

Are there any performance implications of using type hints?

No, type hints are not enforced at runtime and do not affect performance. They are mainly for static type checkers and IDEs.