What are the best practices for using type hints in Python?

What are the best practices for using type hints in Python?

Using type hints improves code readability and helps with static type checking. Best practices include using the Optional type for nullable values, List and Dict for collections, and defining custom types with TypeVar.

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

Sure! Here's a simple example:

from typing import List

def greet_users(names: List[str]) -> None:
    for name in names:
        print(f'Hello, {name}!')

What about type hints for class methods?

For class methods, you can use type hints similarly. Here's an example:

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

    def get_info(self) -> str:
        return f'{self.name} is {self.age} years old.'

Are there any tools to help with type checking?

Yes! Tools like mypy can be used to perform static type checking in your Python code, ensuring that your type hints are correctly implemented.