NameError: name __session__ is not defined

[ctcjab]

When I execute a notebook in Jupyter Lab that uses the __session__ variable to resolve the path to the notebook, it works.

When I execute such a notebook via nbconvert --execute, it fails with NameError: name __session__ is not defined:

❯ jupyter nbconvert tmp.ipynb --to html --execute
[NbConvertApp] Converting notebook tmp.ipynb to html
Traceback (most recent call last):
  File "/opt/conda/bin/jupyter-nbconvert", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/jupyter_core/application.py", line 283, in launch_instance
    super().launch_instance(argv=argv, **kwargs)
  File "/opt/conda/lib/python3.12/site-packages/traitlets/config/application.py", line 1075, in launch_instance
    app.start()
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/nbconvertapp.py", line 420, in start
    self.convert_notebooks()
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/nbconvertapp.py", line 597, in convert_notebooks
    self.convert_single_notebook(notebook_filename)
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/nbconvertapp.py", line 563, in convert_single_notebook
    output, resources = self.export_single_notebook(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/nbconvertapp.py", line 487, in export_single_notebook
    output, resources = self.exporter.from_filename(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/templateexporter.py", line 390, in from_filename
    return super().from_filename(filename, resources, **kw)  # type:ignore[return-value]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/exporter.py", line 201, in from_filename
    return self.from_file(f, resources=resources, **kw)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/templateexporter.py", line 396, in from_file
    return super().from_file(file_stream, resources, **kw)  # type:ignore[return-value]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/exporter.py", line 220, in from_file
    return self.from_notebook_node(
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/html.py", line 278, in from_notebook_node
    html, resources = super().from_notebook_node(nb, resources, **kw)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/templateexporter.py", line 412, in from_notebook_node
    nb_copy, resources = super().from_notebook_node(nb, resources, **kw)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/exporter.py", line 154, in from_notebook_node
    nb_copy, resources = self._preprocess(nb_copy, resources)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/exporters/exporter.py", line 353, in _preprocess
    nbc, resc = preprocessor(nbc, resc)
                ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/preprocessors/base.py", line 48, in __call__
    return self.preprocess(nb, resources)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/preprocessors/execute.py", line 103, in preprocess
    self.preprocess_cell(cell, resources, index)
  File "/opt/conda/lib/python3.12/site-packages/nbconvert/preprocessors/execute.py", line 124, in preprocess_cell
    cell = self.execute_cell(cell, index, store_history=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/jupyter_core/utils/__init__.py", line 165, in wrapped
    return loop.run_until_complete(inner)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/asyncio/base_events.py", line 691, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/site-packages/nbclient/client.py", line 1062, in async_execute_cell
    await self._check_raise_for_error(cell, cell_index, exec_reply)
  File "/opt/conda/lib/python3.12/site-packages/nbclient/client.py", line 918, in _check_raise_for_error
    raise CellExecutionError.from_cell_and_msg(cell, exec_reply_content)
nbclient.exceptions.CellExecutionError: An error occurred while executing the following cell:
------------------
__session__
------------------


---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 __session__

NameError: name '__session__' is not defined

Works in Jupyter Lab: