[versteegen]

Well, SciPy depends heavily on NumPy, which as a CPython-specific extension won't run on other Python interpreters in general. Although for example there is ulab for MicroPython which replicates part of NumPy, and PyPy has a compatibility layer for CPython extensions.

Edit: well, Regessio itself also depends on NumPy, but might be able to run on top of ulab whereas I really doubt SciPy would.

[nothrowaways]

The repo on OP also depends on numpy

[t6jvcereio]

Responding that there's something out there called ulab doesn't really answer my question, which was: where does op's requirement to not use scipy come from.