[IPython-dev] Asyncio extensions for IPython

[Thomas Kluyver]

Hi Martin,

Thanks, that's a fascinating extension. It's impressively little code to do
something quite complex. I'm also glad to see someone making use of the
ast_transformers hook.

I noticed you've put it under a GPL license. Much of this ecosystem is BSD,
so that means your code couldn't ever be integrated into a project like
IPython. Of course the license is your choice, and I know people feel
strongly about this, but if you would ever consider relicensing it, it's
much easier to do that now than years down the line when you have to
contact every contributor.

Thanks,
Thomas

On 30 September 2014 07:53, Martin Teichmann <lkb.teichmann at gmail.com>
wrote:

> Hi,
>
> I've been working with the Python 3.4 asyncio package, which
> uses the yield from statement to perform asynchronous I/O.
>
> I realized that such an approach might also be useful for IPython,
> as it allows to start tasks in the background without stopping the
> currently running event loop, and without using threads. So I wrote
> an asyncio extension for IPython. It allows to use the yield from
> statement at the command line.
>
> The important difference to normal commands is, that while they are
> executed the currently running event loop continues, which is most
> visible if you are running something like matplotlib. So, while the
> I/O stuff is running "in the background", the matplotlib Qt window is
> still responsive.
>
> To give an example (don't forget you need python 3.4)
>
>     In [1]: %load_ext yf  # this is my extension
>     In [2]: from asyncio import sleep, async
>     In [3]: def f():
>        ...:    yield from sleep(3)
>        ...:    print("done")
>        ...:    return "returned"
>     In [4]: yield from f()
>      #[wait three seconds]
>     done
>     Out[4]: 'returned'
>     In [5]: async(f())
>     Out[5]: Task(<f>)<PENDING>
>     In [6]: #[wait three seconds, or type other commands] done
>
> this is a trivial example which just sleeps, but the point is, it could do
> anything else, especially I/O, and still the GUI would be responsive.
>
> I put this extension onto github as
>
> https://github.com/tecki/ipython-yf
>
> Greetings
>
> Martin
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