ipython stops responding after suspending with ctrl-z

[jesaerys]

With other python+ipython installations (e.g., using homebrew), I can suspend a terminal ipython session with ctrl-z, work in the shell for a bit, and then come back to ipython with fg. This does not work with ipython in anaconda. I never get my prompt back after typing fg (even after pressing enter and ctrl-c a few times), so I have to ctrl-z back to the shell and then kill the ipython process.

Is this a bug?

ctrl-z and fg work just fine for the regular python interpreter in anaconda.

I'm on Mac OS 10.9.

[asmeurer]

This likely has to do with the fact it uses python.app.

[asmeurer]

I think it's because ipython runs python.app and python.app starts python in bash. So when you run ipython there are two processes, like

58535 ttys011    0:00.04 /bin/bash /Users/aaronmeurer/anaconda/bin/python.app /Users/aaronmeurer/anaconda/bin/ipython
58536 ttys011    0:00.59 /Users/aaronmeurer/anaconda/python.app/Contents/MacOS/python /Users/aaronmeurer/anaconda/bin/ipython

If I manually kill -SIGCONT 58536 in addition to running fg, it restarts.

[asmeurer]

It also works if I run fg %1, which should be a usable workaround for you.

[asmeurer]

I wonder if it's possible to add a trap to the python.app script that makes this work as expected.

[jesaerys]

Thanks, these suggestions seem to work. I'll close this issue.

Are you referring to anaconda/bin/python.app? It looks like that file is just a two line bash script. Otherwise there's anaconda/python.app/Contents/MacOS/python, but that's binary so I can't edit it.

[asmeurer]

Yes, I mean the bin/python.app. It is a two-line bash script, but the issue is that ipython uses it as its shebang line, resulting in two processes when ipython starts.

[keflavich]

I had asked a question about this here (after this issue was raised... so I just missed it when googling or it wasn't indexed yet), and the answer in this thread worked for me.

[ideascidata]

I realize this is a blast from the past...but I finally was able to figure out a working solution in Anaconda!

CTRL+S worked for me when using jupyter notebook with Anaconda.

You must use this key combo in the terminal for this to work. Also, other key combinations that didn't work for me but were suggested elsewhere include: CTRL+Z and CTRL+I

Hopefully this can at least help out someone down the line...