[Python-Dev] PEP 484 (Type Hints) -- the next draft is here

[Guido van Rossum]

That's a good question. We *could* make it so that you can subclass
Generator and instantiate the instances; or we could even make it do some
structural type checking. (Please file a pull request or issue for this at
github.com/ambv/typehinting .) But perhaps we should also change asyncio?
What check are you talking about?

On Fri, Apr 17, 2015 at 10:35 PM, Stefan Behnel <stefan_ml at behnel.de> wrote:

> Guido van Rossum schrieb am 17.04.2015 um 23:58:
> > The ``typing`` module defines the ``Generator`` type for return values
> > of generator functions. It is a subtype of ``Iterable`` and it has
> > additional type variables for the type accepted by the ``send()``
> > method and the return type of the generator:
> >
> > * Generator, used as ``Generator[yield_type, send_type, return_type]``
>
> Is this meant to accept only Python generators, or any kind of object that
> implements the coroutine protocol? I'm asking because asyncio currently
> suffers from an annoying type check here, so I'd like to avoid that this
> problem keeps popping up again in other places.
>
> Stefan
>
>
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-- 
--Guido van Rossum (python.org/~guido)
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