Passing configuration to IPython.embed and IPython.embed_kernel

[eric-wieser]

Apologies if this is the wrong place to ask this, I tried on the gitter but it doesn't seem particularly active.

I'm trying to create an embedded ipython with a custom async loop runner. My naive attempt is something like:

import IPython
from traitlets.config import Config
c = Config()
c.InteractiveShell.loop_runner = print  # not a real runner, but enough to debug
IPython.embed(config=c)

but in the shell, get_ipython().loop_runner is still set to IPython.core.async_helpers._pseudo_sync_runner.

Am I setting the config wrongly, or is this config special and somehow harder to set?

Possibly a duplicate of #10724

[Carreau]

Something like that ?

import IPython

def trio_runner(async_fn):
    import trio

    async def loc(coro):
        """
        We need the dummy no-op async def to protect from
        trio's internal. See https://github.com/python-trio/trio/issues/89
        """
        return await coro
    print('Running with my runner')
    return trio.run(loc, async_fn)


IPython.embed(using=trio_runner)

$ python foo.py
Python 3.8.1 | packaged by conda-forge | (default, Jan 29 2020, 15:06:10)
Type 'copyright', 'credits' or 'license' for more information
IPython 8.0.0.dev -- An enhanced Interactive Python. Type '?' for help.

In [1]: import trio

In [2]: await trio.sleep(1)
Running with my runner

In [3]:

embed() is a bit weird and overwrite the config because of nesting.

[eric-wieser]

Where can I find documentation of the using argument?

That looks promising, thanks!

[eric-wieser]

Thanks for the help, your example solved my issue.

In the end though, I needed extra configuration so used the IPython.terminal.embed.InteractiveShellEmbed constructor.

Probably still worth leaving this issue open as a documentation issue about describing using.