[Python] How to specify return type in an async Python function?

In TypeScript, you would do something like

async function getString(word: string): Promise<string> {
return word;
}


How can I do the same in Python? I tried the following:

async def get_string(word: str) -> Coroutine[str]:
return word


And got this traceback:

TypeError: Too few parameters for typing.Coroutine; actual 1, expected 3


So Coroutine expects 3 types. But why? And what should they be in this case?

This is also specified in the docs, but I still don't understand

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