i'm pretty sure there already is a python sky tool, made by someone here, did you see/search for it?
-- or, did you see it and it is not what you want?
Yea but it is just a replacement for Sky3ds DiskWriter###.exe for writing to your sd card
Would be nice if your python and his python were merged in a single git repository so others can modify
https://github.com/lukas2511/sky3ds.py
https://gbatemp.net/threads/sky3ds-diskwriter-python-clone-for-linux-osx.377700/