[Python-ideas] Built-in function to run coroutines

[Andrew Svetlov]

On other hand having builtin for making toy examples in interactive mode
looks very redundant.

On Sat, Nov 12, 2016 at 10:38 PM Ivan Levkivskyi <levkivskyi at gmail.com>
wrote:

> Hi,
>
> async/await syntax is a very nice recent feature, but there is something
> that I miss for coroutines defined with async def, as compared to
> generators. Coroutines represent an interesting mental model that goes
> beyond only asynchronous IO, so that I play with them in REPL often. But
> there is no built-in function to actually run a coroutine, so that
> typically I use something like:
>
> >>> def run(coro):
> ...     try:
> ...         coro.send(None)
> ...     except StopIteration as e:
> ...         return e.value
>
> >>> async def f():
> ...     return 42
>
> >>> run(f())
> 42
>
> There is a simple yet useful function for interactive play with generators
> - ``next``, but not for coroutines. There is an option to do:
>
> >>> import asyncio
> >>> loop = asyncio.get_event_loop()
> >>> loop.run_until_complete(f())
> 42
>
> But this feels a bit redundant for an interactive play. I would propose to
> add something like an above described ``run`` function to built-ins.
>
> Yes, I know, there is a very high bar for adding a built-in function, but
> I believe such a function will help to promote async/await to a wider
> community (especially to novices).
>
> --
> Ivan
>
>
> _______________________________________________
> Python-ideas mailing list
> Python-ideas at python.org
> https://mail.python.org/mailman/listinfo/python-ideas
> Code of Conduct: http://python.org/psf/codeofconduct/

-- 
Thanks,
Andrew Svetlov
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20161112/b4b5da2c/attachment-0001.html>