> For these cases, typing rules and annotations will be a boon. You can use PEP3... | Hacker News

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kevin_thibedeau on Dec 20, 2014 | parent | context | favorite | on: Guido van Rossum: The Theory of Type Hinting for P...

> For these cases, typing rules and annotations will be a boon.

You can use PEP3107 annotations today and automatically validate them using a decorator to eliminate boilerplate code like that. They don't have to be something to look forward to tomorrow.

ak217 on Dec 20, 2014 [–]

Related: https://github.com/kislyuk/ensure

A (relatively) high performance runtime annotation type checker.

    from ensure import ensure_annotations
    
    @ensure_annotations
    def f(x: int, y: float) -> float:
        return x+y

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