What are Python type hints and how do I use them?

What are Python type hints and how do I use them?

Python type hints are a way to indicate the expected data types of variables, function parameters, and return values. They help improve code readability and can assist with static type checking.

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

Sure! Here's a simple example:

def add_numbers(a: int, b: int) -> int:
    return a + b

In this function, a and b are expected to be integers, and the function returns an integer.

Are type hints mandatory in Python?

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

What tools can I use to check type hints?

You can use tools like mypy for static type checking, or IDEs like PyCharm that have built-in support for type hints.