command line ipython kernel incantation / API?

[John Kitchin]

Hi,

I was wondering if there is a command to start an ipython kernel that you can communicate with through http requests. I want to communicate with the kernel through emacs to execute  code blocks, inspect things, get completion targets, and to interrupt the kernel.  I haven't found any specific documentation that suggests this exists though.

I am familiar with the EIN project, but it does not seem to work for me. I also know of the ob-ipython project. I currently use that, but it has its own python driver to create a web server attached to a kernel. It does not support completion or interruption though, and it isn't obvious how to extend it.

Thanks!

[Matthias Bussonnier]

Hi John,

The (best?) place to start is Jupyter Client docs [1], if you want to
communicate with a pure kernel you'll have to use ZMQ – not much
harder than HTTP[2], it's basically sockets on steroids –. and you
want to manually use `python -m ipykernel <connection file>` to start
a python kernel. The connection file give you infomations on how to
bind/connect ZMQ ports. The "Making a kernel" part is the most
complete (as that's what usually people are interested in), and we
should improve the "making a client" part (maybe with your help ?).
Regardless bug report welcome, and despite the jupyter_client
implementation being in Python, any example in documentation in other
languages welcome.

Hope that helps get you started.

Cheers
--
M
[1] http://jupyter-client.readthedocs.io/en/latest/
[2] the "Http" communication with kernels is actually websoket, and
the `jupyter notebook`application is a websocket<->ZMQ bridge.

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[John Kitchin]

Thanks for the pointers. I will take a look at these. If I get anything working, I would be happy to share it.

[John Kitchin]

I am trying something like this:

#+BEGIN_SRC python :results output org drawer

import jupyter_client as client

find_connection_file = client.find_connection_file

cf = find_connection_file('test')

c = client.BlockingKernelClient(connection_file=cf)

c.load_connection_file()

c.start_channels()

msgid = c.execute('a=9')

print(msgid)

#+END_SRC

#+RESULTS:

:RESULTS:

df3b62be-dd12-4ebe-8f93-0a6045dc632d

:END:

It seems that the a=9 code was executed, but I can't figure out how to get results back from the kernel. I expected I would get an execute_reply back, but I got a msg id instead. Am I supposed to use that in another call to get the reply or something?

On Monday, June 5, 2017 at 11:42:10 PM UTC-6, Matthias Bussonnier wrote:

[Roland Weber]

Hello John,

if you get a message ID instead of an actual reply, then you didn't specify to wait for the reply:

https://github.com/jupyter/jupyter_client/blob/master/jupyter_client/blocking/client.py#L44

I'm not familiar with the API, but this might work:

  replymsg = c.execute('a=9', reply=True)

hope that helps,

  Roland

[John Kitchin]

Thanks. That doesn't seem to be allowed in the version of jupyter I have (it looks like I have protocol 5.0).