What is the Python typing module and how does type checking work?

What is the Python typing module and how does type checking work?

The Python typing module provides support for type hints, allowing you to specify the expected data types of variables, function parameters, and return values.

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

Sure! Here's a simple example:

from typing import List

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

What happens if I don't use type hints?

If you don't use type hints, Python will still run your code, but you lose the benefits of static type checking, which can help catch errors before runtime.

Are there any tools to help with type checking in Python?

Yes, tools like mypy can be used to perform static type checking based on the type hints you provide in your code.