What are some common mistakes in Python typing?

What are some common mistakes in Python typing?

Some common mistakes include using the wrong type hints, not using Optional for nullable types, and forgetting to import typing modules.

Can you give me an example of using Optional?

Sure! You can use Optional like this: def func(param: Optional[str]) -> None:. This indicates that param can be a string or None.

What happens if I don't use type hints at all?

If you don't use type hints, your code will still run, but it may be harder to understand and maintain, and you'll miss out on type checking.

Are there tools to help with type checking in Python?

Yes, tools like mypy and Pyright can help you check type hints and catch errors before runtime.