Fix bug on nbconvert: No module named 'notebook.services'

[jalsti]

when running jupyter nbconvert --execute --allow-errors --to pdf myfile.ipynb an error occured:
"""
File "/home/user/.local/lib/python3.11/site-packages/jupyter_contrib_nbextensions/nbconvert_support/init.py", line 5, in
from .collapsible_headings import ExporterCollapsibleHeadings
File "/home/user/.local/lib/python3.11/site-packages/jupyter_contrib_nbextensions/nbconvert_support/collapsible_headings.py", line 6, in
from notebook.services.config import ConfigManager
ModuleNotFoundError: No module named 'notebook.services'
"""

This change updates collapsible_headings.py to use the correct import from jupyter_server.services.config import ConfigManager

[MichaelWoodc]

Just encountered this issue right now! Not sure what changed overnight. Thanks for jumping on it!

[rprilepskiy]

I just got the same issue! @jalsti, thanks for stepping in and contribution! I tried to implement your change manually. But I got another error when running jupyter nbconvert --to script myfile.ipynb:

Traceback (most recent call last):
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/jupyter_contrib_nbextensions/nbconvert_support/execute_time.py", line 11, in <module>
    import notebook._tz as nbtz
ModuleNotFoundError: No module named 'notebook._tz'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/bin/jupyter-nbconvert", line 5, in <module>
    from nbconvert.nbconvertapp import main
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/nbconvert/nbconvertapp.py", line 193, in <module>
    class NbConvertApp(JupyterApp):
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/nbconvert/nbconvertapp.py", line 252, in NbConvertApp
    Options include {get_export_names()}.
                     ^^^^^^^^^^^^^^^^^^
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/nbconvert/exporters/base.py", line 145, in get_export_names
    e = get_exporter(exporter_name)(config=config)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/nbconvert/exporters/base.py", line 106, in get_exporter
    exporter = items[0].load()
               ^^^^^^^^^^^^^^^
  File "/home/user/.pyenv/versions/3.11.9/lib/python3.11/importlib/metadata/__init__.py", line 202, in load
    module = import_module(match.group('module'))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.pyenv/versions/3.11.9/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/jupyter_contrib_nbextensions/nbconvert_support/__init__.py", line 7, in <module>
    from .execute_time import ExecuteTimePreprocessor
  File "/home/user/.pyenv/versions/3.11.9/envs/py3_11/lib/python3.11/site-packages/jupyter_contrib_nbextensions/nbconvert_support/execute_time.py", line 14, in <module>
    import notebook.services.contents.tz as nbtz
ModuleNotFoundError: No module named 'notebook.services'

It seems that there should be some other changes in
/site-packages/jupyter_contrib_nbextensions/nbconvert_support/execute_time.py:

Before:
[line 11] import notebook._tz as nbtz

After:
[line 11] import jupyter_server._tz as nbtz

After that my ipynb converting was successful.

Just in case:

jupyter_contrib_nbextensions      0.7.0
jupyter_server                    2.14.2
nbconvert                         7.16.4
notebook                          7.2.1

[darthoctopus]

applying this and @rprilepskiy's changes fixed this issue for me too