How do I use type annotations in Python?

How do I use type annotations in Python?

Type annotations in Python allow you to specify the expected data types of variables, function parameters, and return values. For example, you can define a function like this: def add(a: int, b: int) -> int:.

Can you give me an example of a function with type annotations?

Sure! Here's an example: def greet(name: str) -> str:. This function takes a string as an argument and returns a string.

What happens if I don't follow the type annotations?

Type annotations are not enforced at runtime, so your code will still run. However, they help with code readability and can be checked by static type checkers like mypy.

Are type annotations mandatory in Python?

No, type annotations are optional in Python. You can write code without them, but using them can improve clarity and help catch errors.