What are Python type hints and how can they be used in libraries?

What are Python type hints and how can they be used in libraries?

Python type hints are a way to indicate the expected data types of function arguments and return values. They help with code readability and can assist tools like linters and IDEs in catching errors before runtime.

Can you give me an example of how to use type hints in a library?

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}!')

In this example, names is expected to be a list of strings.

Are there any benefits to using type hints in my code?

Yes, type hints improve code clarity, enable better static analysis, and can help prevent bugs by ensuring that the correct data types are used.

Do all Python libraries use type hints?

Not all libraries use type hints, but many modern libraries do, especially those that aim for better maintainability and developer experience.