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ipyparallel causing problem in calling a qtconsole from an ipython jupyter notebook #922
Description
With the last several months, I have problems starting a qtconsole from a jupyter ipython notebook. The problem seems to be caused because I have ipyparallel imported. I get the following error code:
`get_ipython().run_line_magic('qtconsole', '')
`
File /usr/lib/python3.12/site-packages/IPython/core/interactiveshell.py:2480,
`with self.builtin_trap: result = fn(*args, **kwargs)
`
File /usr/lib/python3.12/site-packages/ipykernel/zmqshell.py:407, in KernelMagics.qtconsole(self, arg_s)
`if "ipyparallel" in sys.modules:
from ipyparallel import bind_kernel
bind_kernel()
try:
connect_qtconsole(argv=arg_split(arg_s, os.name == "posix"))
`
File /usr/lib/python3.12/site-packages/ipyparallel/init.py:51, in bind_kernel(**kwargs)
` else:
return app.bind_kernel(**kwargs)
raise RuntimeError("bind_kernel must be called from an IPEngine instance")
`
RuntimeError: bind_kernel must be called from an IPEngine instance
I have not found anyone else having this problem.
thanks
Activity
minrk commentedon Feb 4, 2025
The check isn't right. I guess
bind_kernelused to be a no-op when not an engine, but now it raises, which I think makes more sense. ipython/ipykernel#1315 removes this call, since it really belongs in ipyparallel, if it belongs anywhere.If you need a short-term workaround, you can do:
to disable
bind_kernel, which should get past the error.kdere commentedon Feb 4, 2025
thanks for the prompt response.
the work-around works
however, I used ipyparallel in a package that is distributed on PyPI so a long term solution would be helpful
thanks for the help
minrk commentedon Feb 4, 2025
ipython/ipykernel#1315 is the permanent fix, removing the call to bind_kernel in ipykernel. I'll see if I can fix it here as well, because there's clearly an expectation that bind_kernel is a no-op for a regular Kernel, which I didn't recall in some recent changes.