Kernel.do_one_iteration never awaited

[kafonek]

Ran into this while working on ideas to solve #10. Was on WSL / dockerized Jupyter based off the docker-stacks minimal-notebook image.

Code:

# cell 1
import ipython_blocking
import ipywidgets as widgets

button = widgets.Button(description="click me", button_style="info")
button

# cell 2
%blockrun button

Error:

/home/jovyan/ipython_blocking/ipython_blocking/ipython_blocking.py:21: RuntimeWarning: coroutine 'Kernel.do_one_iteration' was never awaited
  self.kernel.do_one_iteration()
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

Versions:

jupyter core     : 4.7.1
jupyter-notebook : 6.4.0
qtconsole        : not installed
ipython          : 7.25.0
ipykernel        : 6.0.3
jupyter client   : 6.1.12
jupyter lab      : 3.0.16
nbconvert        : 6.1.0
ipywidgets       : 7.6.3
nbformat         : 5.1.3
traitlets        : 5.0.5

[dokempf]

I can confirm this bug. For me, downgrading to ipython==7.21.0 and ipykernel==5.5.5 solves the issue. This is not meant as a solution, but as a hint for finding the root of the problem.