Notebook cells don't run after first error until PyQ kernel restart

[webradio]

This is a continuation of https://stackoverflow.com/questions/53739406/notebook-cells-dont-run-after-first-error-until-pyq-kernel-restart/53869615. pyq kernel 1.0.1 didn't help.

Questions

• [ ] Which operating system are you using (if Linux, please provide flavour of it, i.e RedHat, CentOS or Ubuntu), is it 32-bit, or 64-bit?

  Ubuntu 18.04.1 LTS 64-bit

• [ ] Which version of PyQ are you running? Please provide output of pyq --versions, if PyQ isn't operational, please provide Python interpreter version and PyQ version python -V; python3 -V; pip list | grep pyq:

  PyQ 4.1.4
  KDB+ 3.6 (2018.10.23) l64
  Python 3.6.7 |Anaconda, Inc.| (default, Oct 23 2018, 19:19:38) 
  [GCC 7.3.0]

• [ ] Which version of kdb+ are you using, is it 32-bit or 64-bit?

  64-bit

  • [ ] If on 64-bit, is your QLIC set? Please provide output env | grep QLIC on linux/macOS, or set|grep QLIC on Windows.
    is not set

• [ ] Did you use virtual environment to install PyQ? If not, why?

  • yes

• [ ] Where is your QHOME? Please provide output env | grep QHOME on linux/macOS, or set|grep QHOME on Windows.

  QHOME=/home/user/miniconda3/envs/pyqtwo/q

• [ ] Do you use Conda? If so, what version?

  conda 4.5.12

Steps to reproduce the issue

Create a fresh virtualenv:

conda update -n base -c defaults conda
conda create -n pyqtwo
source activate pyqtwo
conda install -c kx -c enlnt pyq
pip install pyq-kernel
# Placed kc.lic into /home/user/miniconda3/envs/pyqtwo/q/
conda install jupyter
pyq -m pyq.kernel install
jupyter kernelspec list
jupyter-notebook --debug

In the jupyter notebook, create a new one with PyQ 3 kernel. Run following cells:
from pyq import q; q('.z.ts') returns {@[i1;();::]}, seems to be pyq kernel 1.0.1, indeed;
nonexisting_function() returns an error;
6*7

Expected result

42

Actual result

Nothing. Notebook unresponsive until kernel restart. If, instead of restarting the kernel, I close the browser with the notebook and press Ctrl-C in the terminal where jupyter-notebook was started, it reports Kernel is taking too long to finish, killing. Both q and pyq run o.k. from a command line.

[abalkin]

This issue is caused by the changes introduced in ipykernel version 5. Downgrading to 4.10 fixes the problem:

pip install -U ipykernel==4.10

[sashkab]

We've release pyq-kernel 1.1, which should work with the latest version of the ipykernel. Please upgrade and try again.

pip install -U pyq-kernel
pyq -m pyq.kernel install