Comment # 5 on bug 1198299 from Eric Schirra

(In reply to Max Lin from comment #4)

> Leap 15.4's default python is 3.6, although we do have python 3.9 exists but
> we provide it just interpreter because multiple python3 version has not
> supported in Leap 15(and SLE15), so python module has compiled with python
> 3.6 only. Can we have a working version with python 3.6?

In setup.py from calibre it is python >= 3.7
And in sources.json it is python 3.8

So i think 3.7 is minimum.
This problem with eol python 3.6 has many, many other packages also. :-(

PS: Who fix security issues? Upstream does nothing. Only Suse? So many free
time? hmm....