Notebook OpenSSL dependency

[Kiran Kedlaya]

I'm building Sage 9.4beta4 on an Ubuntu 21.04 system, and the build superficially looks fine until I try to start Sage in notebook mode:

Traceback (most recent call last):

  File "/home/kedlaya/sage/local/lib/python3.9/site-packages/sage/repl/ipython_kernel/install.py", line 269, in have_prerequisites

    from notebook.notebookapp import NotebookApp

ModuleNotFoundError: No module named 'notebook'

The Jupyter notebook requires ssl, even if you do not use

https. Install the openssl development packages in your system and

then rebuild Python (sage -f python3).

I presume this is an issue because Sage is using my systemwide Python (3.9.5) rather than building its own. Anyone know what Ubuntu package provides the appropriate dependency? Better yet, why isn't the configure script checking for this?

Kiran

[Matthias Koeppe]

This has most likely nothing to do with openssl, despite the "helpful" message issued by the script src/bin/sage-notebook

[Kiran Kedlaya]

My guess is the Sage build was somehow incomplete, I did a fresh rebuild and the issue went away.

If I'm able to reproduce this I'll post again...

[Dima Pasechnik]

There is a way to use notebook from the system, already in 9.3.
See https://doc.sagemath.org/html/en/installation/launching.html#setting-up-sagemath-as-a-jupyter-kernel-in-an-existing-jupyter-notebook-or-jupyterlab-installation
This doc was added in https://trac.sagemath.org/ticket/30476

IMHO this should become the default way to use jupyter.

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[Matthias Koeppe]

https://trac.sagemath.org/ticket/29291 changes the handling of import errors in "sage-notebook", needs review