What are mypy annotations and how do I use them?

What are mypy annotations and how do I use them?

Mypy annotations are a way to add type hints to your Python code, helping with static type checking.

Can you give me an example of how to use them?

Sure! You can annotate a function like this: def greet(name: str) -> str:. This indicates that name should be a string.

What happens if I don't use mypy annotations?

Without mypy annotations, you lose the benefits of static type checking, which can help catch errors before runtime.

Is it mandatory to use mypy annotations in Python?

No, it's not mandatory. They are optional but highly recommended for better code quality and maintainability.