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

Guido van Rossum guido at python.org
Sat Apr 18 18:39:30 CEST 2015

(Also, there might be some interaction with PEP 492 here, which also tweaks the definition of generators.)

On Sat, Apr 18, 2015 at 9:38 AM, Guido van Rossum <guido at python.org> wrote:

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 <stefanml 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[yieldtype, sendtype, returntype]

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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