What is runtime type checking in Python?

What is runtime type checking in Python?

Runtime type checking in Python involves verifying the types of variables during program execution, rather than at compile time.

Why is it important to use runtime type checking?

It helps catch type-related errors that may not be evident until the code is executed, improving code reliability.

Can you give me an example of how to implement it?

Sure! You can use the isinstance() function to check types at runtime. For example:

def add_numbers(a: int, b: int) -> int:
    if not isinstance(a, int) or not isinstance(b, int):
        raise TypeError('Both arguments must be integers')
    return a + b

Are there any libraries that can help with this?

Yes, libraries like pydantic and typeguard can help enforce type checks at runtime in Python.