Always great to hear from you, Jason!  
 

> 2. Karl-Dieter, to answer your question about notebooks: we've worked 
> really hard to make the transition from "classic Notebook" to JupyterLab 
> smooth, so yes, it not only opens notebook files, but we also went to great 
> lengths to have feature parity with notebook.
>
>>
>>
As you know, my primary concern remains with those who are not using Sage 
via administered solutions, but who will have had to change notebook 
format/style possibly twice within five years.  For research 
mathematicians, data scientists, etc., that is nothing; for someone who 
only teaches a certain course once every two or three years, that could 
make someone prefer to stay with a "more stable" notebook interface - say, 
one that starts with an M, not to put too fine a point on it.

To make a positive suggestion, would it be possible for whatever the Sage 
default behavior for opening a worksheet is to have some sort of backward 
compatibility as well?  As an example, if we can get someone to update the 
Mac app to launch a Jupyterlab server instead of a Jupyter server whenever 
that would become the default, that would be useful.  (Otherwise the Mac 
app may have to be dropped, since its primary usefulness is in being able 
to "just start a worksheet" and have it paired to .sws or .ipynb files 
through the GUI, though there are many quite useful secondary features as 
well.)  Ideally a user who only interacts via single-user worksheets, no 
matter how they launch them, might never even notice the difference, though 
maybe that's not possible.

"We're really excited about some of the improvements coming in JupyterLab 
3.0 (targeted for release before JupyterCon), especially in the 
single-document mode that makes it much more approachable, similar to the 
simplicity you get in the classic Notebook."

That sounds great.  Are there screenshots available for those who might not 
have time to test out Jupyterlab properly?

Concluding unscientific postscript: I do continue to also state the 
minority opinion that (non-corporate, e.g. not certain Linux distros, the 
biggest programming languages, some R solutions) open source technology 
needs to worry a little more about long-term support if it is to ever go 
beyond the cognoscenti.  Maybe that isn't the goal.  But that would be a 
shame.

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