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Comment by fantispug | Hacker News Reader

I use this kind of workflow all the time in Emacs. I write code in one window and have a Jupyter REPL in the other and send code to the REPL to test things live as I'm coding.

I'll have "pdb" set up in Jupyter REPL so it drops into a debugger when I have an error with a function.

In the case of a long running function I want to debug (like the video example at the end) I'll set local variables with the same names as the variables of the function and then execute the function line-by-line/chunk-by-chunk.

The only problem is losing track of global state, but the same thing can happen in Jupyter notebooks.

This type of workflow is really common in Lisp and R.

If I want to integrate documentation and code, I'll use org-babel or R Markdown (which does work with Python).

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What do you use for running the jupyter REPL in emacs? I haven't found a great way of doing so yet. Just running it in a comint buffer?

Yeah, just comint with elpy. There are some rough edges; I can't input multiline in the comint buffer (but can send it), and gives an error on the very first command, but otherwise works well.

ob-ipython works really well.

The REPL opened with org-babel-switch-to-session has been really buggy for me. Has it worked for you? Could just be because I'm using it with non-python kernels, which isn't well supported yet in general as far as I can tell.

I've only used it with a Python kernel so far, and doing eval on each or all blocks in the buffer (org-ctrl-c-ctrl-c, and org-babel-execute-buffer). Haven't had problems so far.

If you connect your code buffer to an jupyter notebook via Emacs IPython Notebook [1] then you can hit C-c C-o (ein:console-open) which will launch a jupyter REPL.

- [1] https://github.com/millejoh/emacs-ipython-notebook

Looks like that just calls make-comint-in-buffer eventually[1] with some fancy stuff to make sure it connects to the same jupyter server as being used for ein. Not sure I see a lot of utility there if I'm just wanting to run a jupyter REPL next to a regular code buffer or e.g. org-mode.

[1] https://github.com/millejoh/emacs-ipython-notebook/blob/cfd0...

i hate actually writing code in Jupyter. part of it is just that my muscle memory is all emacs. but its not just the muscle memory, its all the features missing that I usually use but are common in an IDE or good editor. Does anyone know whether emacs ipython notebook is still viable?

Yes Emacs IPython Notebook is alive and kicking [1]. I recently wrote a tool on top of it and found most everything to work, even as I was banging on it pretty hard at times.

- [1] https://github.com/millejoh/emacs-ipython-notebook

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