Colab notebooks with widget outputs fail due to missing state var

[adamgayoso]

I'm building a simple Jupyter book with one notebook that was created and downloaded from Google Colab (also opened and saved locally).

For jupyter book I have execute set to off and have no widgets in my notebook.

reading sources... [100%] Stereoscope                                                                                                                                                                                                                                             
Exception occurred:
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/jupyter_sphinx/execute.py", line 283, in contains_widgets
    return widgets and widgets["state"]
KeyError: 'state'
The full traceback has been saved in /var/folders/1y/1rd4wh5x3hz548vp04mqdqy80000gn/T/sphinx-err-g82hh2tk.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
Traceback (most recent call last):
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/jupyter_book/sphinx.py", line 150, in build_sphinx
    app.build(force_all, filenames)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/application.py", line 348, in build
    self.builder.build_update()
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 299, in build_update
    len(to_build))
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 311, in build
    updated_docnames = set(self.read())
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 418, in read
    self._read_serial(docnames)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 439, in _read_serial
    self.read_doc(docname)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 479, in read_doc
    doctree = read_doc(self.app, self.env, self.env.doc2path(docname))
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/io.py", line 223, in read_doc
    pub.publish()
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/docutils/core.py", line 218, in publish
    self.settings)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/sphinx/io.py", line 128, in read
    self.parse()
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/docutils/readers/__init__.py", line 77, in parse
    self.parser.parse(self.input, document)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/myst_nb/parser.py", line 84, in parse
    self.env.config["nb_render_plugin"],
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/myst_nb/parser.py", line 203, in nb_to_tokens
    if contains_widgets(ntbk):
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/jupyter_sphinx/execute.py", line 283, in contains_widgets
    return widgets and widgets["state"]
KeyError: 'state'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/bin/jupyter-book", line 8, in <module>
    sys.exit(main())
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/jupyter_book/commands/__init__.py", line 305, in build
    result, builder, OUTPUT_PATH, build_type, PAGE_NAME, click.echo
  File "/Users/adamgayoso/.pyenv/versions/3.7.6/lib/python3.7/site-packages/jupyter_book/commands/__init__.py", line 546, in builder_specific_actions
    raise RuntimeError(_message_box(msg, color="red", doprint=False)) from result
RuntimeError: 
===============================================================================

There was an error in building your book. Look above for the cause.

===============================================================================

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[choldgraf]

Hey @adamgayoso - I'm guessing that this has to do with how Colab is saving widgets in the notebook metadata, we've had a few inconsistencies with how Colab handles this in the past. I'd recommend generating the notebooks from a Jupyter interface to make sure the widget state is properly saved in the notebook.