[Python-ideas] Proposal: Use mypy syntax for function annotations

[Łukasz Langa]

On Aug 14, 2014, at 12:02 PM, Steven D'Aprano <steve at pearwood.info> wrote:

> Would it be possible, and desirable, to modify the built-in types so 
> that we could re-use them in the type annotations?
> 
>    def word_count(input: list[str]) -> dict[str, int]:
> 
> 
> Since types are otherwise unlikely to be indexable like that, I think 
> that might work.

-1 on that idea. Actually, -1 on List, Dict and friends as well.

Square brackets are for lookup (indexing, key-based, or slicing). Saying here that you’re “looking up” a subtype of list that holds strings is a far stretch.

-- 
Best regards,
Łukasz Langa

WWW: http://lukasz.langa.pl/
Twitter: @llanga
IRC: ambv on #python-dev
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