This is because tornado 5.0 deliberately removed
ioloop.IOLoop.initialized() because "It is no longer possible to provide
this method with reasonable semantics":
https://github.com/tornadoweb/tornado/commit/426b3812b9dd21ae0bac19d4146c6952816c7bfe#diff-1d4144f0ef561b7c18c7fe438816e1f5
This bug probably doesn't affect pyzmq 17 (since
https://github.com/zeromq/pyzmq/commit/f24a264094c6aae2587279c052fcbe242dd9d157#diff-079289d3903c2adcc75b3beb3458a2cf
), but I don't know whether upgrading Debian's pyzmq to that would break
anything else.
Another option is to remove this assert() (zmq/eventloop/ioloop.py:210)
or move it inside a tornado_version check.
It is likely that both Python 2 and 3 are affected, but I have not tried
to verify this. At least Jupyter/ipykernel (via
python3-jupyter-client), sagemath, circus and salt-{master,minion}
Depend: on both python(3)-tornado and python(3)-zmq, but I have only
tested the first.
Stack trace (this input file is
https://salsa.debian.org/science-team/theano/blob/master/doc/library/d3viz/index.ipynb
, but any .ipynb file would probably do):
# apt-get install jupyter-nbconvert python3-ipykernel
$ jupyter-nbconvert --to notebook --execute --allow-errors index.ipynb
[NbConvertApp] Converting notebook index.ipynb to notebook
[NbConvertApp] Executing notebook with kernel: python3
Traceback (most recent call last):
File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/usr/lib/python3/dist-packages/ipykernel_launcher.py", line 16,
in <module>
app.launch_new_instance()
File
"/usr/lib/python3/dist-packages/traitlets/config/application.py", line
657, in launch_instance
app.initialize(argv)
File "<decorator-gen-121>", line 2, in initialize
File
"/usr/lib/python3/dist-packages/traitlets/config/application.py", line
87, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/lib/python3/dist-packages/ipykernel/kernelapp.py", line
452, in initialize
zmq_ioloop.install()
File "/usr/lib/python3/dist-packages/zmq/eventloop/ioloop.py", line
210, in install
assert (not ioloop.IOLoop.initialized()) or \
AttributeError: type object 'IOLoop' has no attribute 'initialized'
Traceback (most recent call last):
File "/usr/bin/jupyter-nbconvert", line 11, in <module>
load_entry_point('nbconvert==5.3.1', 'console_scripts',
'jupyter-nbconvert')()
File "/usr/lib/python3/dist-packages/jupyter_core/application.py",
line 266, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File
"/usr/lib/python3/dist-packages/traitlets/config/application.py", line
658, in launch_instance
app.start()
File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line
325, in start
self.convert_notebooks()
File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line
493, in convert_notebooks
self.convert_single_notebook(notebook_filename)
File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line
464, in convert_single_notebook
output, resources = self.export_single_notebook(notebook_filename,
resources, input_buffer=input_buffer)
File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line
393, in export_single_notebook
output, resources = self.exporter.from_filename(notebook_filename,
resources=resources)
File
"/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line
174, in from_filename
return self.from_file(f, resources=resources, **kw)
File
"/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line
192, in from_file
return self.from_notebook_node(nbformat.read(file_stream,
as_version=4), resources=resources, **kw)
File
"/usr/lib/python3/dist-packages/nbconvert/exporters/notebook.py", line
31, in from_notebook_node
nb_copy, resources = super(NotebookExporter,
self).from_notebook_node(nb, resources, **kw)
File
"/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line
134, in from_notebook_node
nb_copy, resources = self._preprocess(nb_copy, resources)
File
"/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line
311, in _preprocess
nbc, resc = preprocessor(nbc, resc)
File
"/usr/lib/python3/dist-packages/nbconvert/preprocessors/base.py", line
47, in __call__
return self.preprocess(nb, resources)
File
"/usr/lib/python3/dist-packages/nbconvert/preprocessors/execute.py",
line 257, in preprocess
cwd=path)
File
"/usr/lib/python3/dist-packages/nbconvert/preprocessors/execute.py",
line 241, in start_new_kernel
kc.wait_for_ready(timeout=startup_timeout)
File
"/usr/lib/python3/dist-packages/jupyter_client/blocking/client.py", line
120, in wait_for_ready
raise RuntimeError('Kernel died before replying to kernel_info')
RuntimeError: Kernel died before replying to kernel_info
$
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