[Python-ideas] A send() built-in function to drive coroutines (original) (raw)

Luciano Ramalho luciano at ramalho.org
Mon Feb 23 14:22:05 CET 2015

On Mon, Feb 23, 2015 at 10:12 AM, Victor Stinner <victor.stinner at gmail.com> wrote:

The use case for your send() function is unclear to me. Why not using send() directly?

Bacause the generator may not have started yet, so gen.send() would fail.

inspect.getgeneratorstate(generator) == 'GENCREATED' test looks weird (why do you need it?).

To know that the generator must be primed.

You should already know if the generator started or not.

I would, if I had written the generator myself. But my code may need to work with a generator that was created by some code that I do not control.

Thanks for your interest, Victor.

Best,

Luciano

Victor 2015-02-23 12:23 GMT+01:00 Luciano Ramalho <luciano at ramalho.org>: On Mon, Feb 23, 2015 at 7:49 AM, Victor Stinner <victor.stinner at gmail.com> wrote:

2015-02-16 13:53 GMT+01:00 Luciano Ramalho <luciano at ramalho.org>:

At a high level, the behavior of send() would be like this:

def send(coroutine, value): if inspect.getgeneratorstate() == 'GENCREATED': next(coroutine) coroutine.send(value) It's strange to have to sometimes run one iterations of the generator, sometimes two iterations. The idea is to handle generators that may or may not be primed. I updated that snippet, it now reads like this: https://gist.github.com/ramalho/c1f7df10308a4bd67198#file-sendbuiltin-py-L43 asyncio.Task is a nice wrapper on top of coroutines, you never use coro.send() explicitly. It makes coroutines easier to use. Yes it is, thanks! My intent was to build something that was not tied to the asyncio event loop, to make coroutines in general easier to use. Thanks for your response, Victor. Best, Luciano -- Luciano Ramalho Twitter: @ramalhoorg Professor em: http://python.pro.br Twitter: @pythonprobr

-- Luciano Ramalho Twitter: @ramalhoorg

Professor em: http://python.pro.br Twitter: @pythonprobr

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