Hi !
The Spyder package is missing from jigdo amd64 weekly 16 GB stick ISO.
All its dependencies are there like python3-spyder, but since spyder itself is missing, spyder can not be used.
https://cdimage.debian.org/cdimage/weekly-builds/amd64/jigdo-16G/
https://packages.debian.org/fr/sid/spyder
I quote from this page : "This package provides the application for Python 3."
Thank you !