[Debian-med-packaging] Bug#937657: Issue with numpy under Python 3.8

[Rebecca N. Palmer]

I think that just means "numpy hasn't yet been rebuilt for Python 3.8". 
(In Python modules that include a C extension, the .py files are shared 
but the C part is compiled separately for each Python version.)

As there are ~500 modules requiring such a rebuild 
(https://release.debian.org/transitions/html/python3.8.html), this may 
take some time.  (numpy itself will probably be a source upload, to move 
1.17 from experimental to unstable.)

For testing, it may be easiest to use an Ubuntu chroot for now.