How do I use type hints in Python classes?

What are type hints in Python and how can I use them in my classes?

Type hints are a way to indicate the expected data types of variables, function parameters, and return values. In classes, you can use them to specify the types of attributes and methods.

Can you show me an example of a class with type hints?

Sure! Here's a simple example:

class Person:
    def __init__(self, name: str, age: int) -> None:
        self.name = name
        self.age = age

    def greet(self) -> str:
        return f'Hello, my name is {self.name} and I am {self.age} years old.'

What happens if I don't use type hints?

If you don't use type hints, your code will still run, but it may be harder to understand and maintain. Type hints help with readability and can catch type-related errors during development.

Are type hints mandatory in Python?

No, type hints are optional in Python. They are a helpful feature for improving code clarity but are not enforced by the interpreter.