[Python-ideas] Fwd: Yielding from the command line

[Martin Teichmann]

Hi Andrew, Hi List,

> [ some discussion about calling yield from from the command line skipped ]
>
> I would love to see this. I'm not sure if I'd love it in practice or not, but until
> someone implements it and I can play with it I'm not sure how I'd become sure.
>
> So... You just volunteered, right? Go build it and put it on PyPI, I want it and
> I'll be your best friend forever and ever no takebacks if you do it. :)

Well, so I did, I wrote an IPython extension that does it and put it up on
https://github.com/tecki/ipython-yf
It's more a mock-up of how it should actually look like, but it is a
functioning mock-up.
So now you can write on the command line stuff like:

    >>> %load_ext yf
    >>> from asyncio import sleep, async
    >>> def f():
    ...     yield from sleep(3)
    ...     print("done")
    >>> yield from f()
     #[wait three seconds]
    done
    >>> async(f())
    >>> #[wait three seconds, or type other commands] done

So as you see, the event loop runs while you are typing commands,
and while they are executed.

Greetings

Martin