What is this square bracket syntax and Dict, Callable in python?and these

Asked Mar 16 '21 at 16:16

Active Mar 16 '21 at 16:18

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I was going through Kaggle environments code. This line is:

def group_by(items: Iterable[TItem], selector: Callable[[TItem], THash]) -> Dict[THash, List[TItem]]:

What are Iterable, Callable and Dict? Are these classes (especially due to capitalized first letter) defined by Python? Also what is this square bracket syntax? Is it something like generics in Java?

asked Mar 16 '21 at 16:16

Rnj

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those are type hints – Netwave Mar 16 '21 at 16:18
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Those are type hints. [You can read more about them here](https://docs.python.org/3/library/typing.html). – crcvd Mar 16 '21 at 16:18

What is this square bracket syntax and Dict, Callable in python?and these

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