On Wednesday, September 3, 2025 at 8:55:01 PM UTC+9 [email protected] 
wrote:

Besides of these discussion, I would like to point out what happens with 
the last version of setuptools. With 73.0.1, the kernel of jupyter is 
correctly installed. For me, by linking this kernel to a place where system 
jupyter can find it, I can use it with no problem with system jupyterlab. 
Another issue of the new version of setuptools is that sagelib is rebuilt 
completely each time.


Right. The current discussion around Dima's solution is off the right path.

Since we know that downgrading setuptools to the previous version solves 
these serious regressions, we should just

(1) downgrade the setuptools for now. This is easy.
(2) investigate why the new setuptools introduces regressions, with time. 
This is difficult, but is not urgent.

I guess that (2) is less difficult and safer than trying to replace the 
"old" time-tested tools with something new. 

Regarding sage development, we should be conservative than revolutionary, 
for stability.




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