How do I use type annotations for parameters in Python?
Type annotations in Python allow you to specify the expected data types of function parameters. For example, you can define a function like this: def greet(name: str) -> None:
where name
is expected to be a string.
Can you give me an example of a function with multiple parameters using type annotations?
Sure! Here's an example: def add_numbers(a: int, b: int) -> int:
This function takes two integers and returns their sum as an integer.
What happens if I pass the wrong type of argument?
If you pass the wrong type, Python won't raise an error immediately, but it can lead to runtime errors if the function tries to perform operations that are not valid for that type.
Is there a way to enforce type checking at runtime?
Yes, you can use libraries like pydantic
or mypy
for static type checking, which can help catch type errors before runtime.
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