[Python-modules-team] Bug#849588: jupyter-nbextension-jupyter-js-widgets: fails to install with a traceback

[Ximin Luo]

Hi Rogério,

Did you previously have jupyter-notebook version 4.2.3-2 installed? If so, then this is the same as:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847917

and all you need to do is remove any empty *.json files in /etc/jupyter/nbconfig. Please also let me know, so that I can close this bug.

If it is not the same as the above linked issue, please send me the output of `ls -la /etc/jupyter/nbconfig` (and ideally the full contents) so that I can try to debug the problem.

X

On Wed, 28 Dec 2016 21:42:05 -0200 =?utf-8?Q?Rog=C3=A9rio?= Brito <rbrito at ime.usp.br> wrote:
> Package: jupyter-nbextension-jupyter-js-widgets
> Version: 5.2.2-2
> Severity: important
> 
> Hi.
> 
> (I'm not sure if this qualifies as an RC-bug, but I left it only as
> important. Please, feel free to raise the severity if appropriate).
> 
> I was just starting to follow a tutorial that needed widgets in a Jupyter
> notebook, but installing jupyter-nbextension-jupyter-js-widgets left me with
> a stack trace when dpkg runs:
> 
> 
> -------------------------
> Setting up jupyter-nbextension-jupyter-js-widgets (5.2.2-2) ...
> /usr/lib/python3.5/runpy.py:125: RuntimeWarning: 'notebook.nbextensions' found in sys.modules after import of package 'notebook', but prior to execution of 'notebook.nbextensions'; this may result in unpredictable behaviour
>   warn(RuntimeWarning(msg))
> Enabling notebook extension jupyter-js-widgets/extension...
> Traceback (most recent call last):
>   File "/usr/lib/python3.5/runpy.py", line 193, in _run_module_as_main
>     "__main__", mod_spec)
>   File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
>     exec(code, run_globals)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 1176, in <module>
>     main()
>   File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 267, 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/notebook/nbextensions.py", line 961, in start
>     super(NBExtensionApp, self).start()
>   File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 256, in start
>     self.subapp.start()
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 871, in start
>     self.toggle_nbextension(self.extra_args[0])
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 861, in toggle_nbextension
>     logger=self.log)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 407, in enable_nbextension
>     logger=logger)
>   File "/usr/lib/python3/dist-packages/notebook/nbextensions.py", line 345, in _set_nbextension_state
>     cm.update(section, {"load_extensions": {require: state}})
>   File "/usr/lib/python3/dist-packages/traitlets/config/manager.py", line 85, in update
>     data = self.get(section_name)
>   File "/usr/lib/python3/dist-packages/traitlets/config/manager.py", line 63, in get
>     return json.load(f)
>   File "/usr/lib/python3.5/json/__init__.py", line 268, in load
>     parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
>   File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
>     return _default_decoder.decode(s)
>   File "/usr/lib/python3.5/json/decoder.py", line 339, in decode
>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
>   File "/usr/lib/python3.5/json/decoder.py", line 357, in raw_decode
>     raise JSONDecodeError("Expecting value", s, err.value) from None
> json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
> dpkg: error processing package jupyter-nbextension-jupyter-js-widgets (--configure):
>  subprocess installed post-installation script returned error exit status 1
> Errors were encountered while processing:
>  jupyter-nbextension-jupyter-js-widgets
> Press Return to continue, 'q' followed by Return to quit.

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