After creating an automated movement effect calculator for the Persona Generator (not yet public). I noticed some issues with the byzantine, unnecessary encumbrance system. Encumbrance is optional. The system included in the Roll Playing Rules helps guide those who are looking for hexagonal punishment for hoarding.
Encumbrance has not been extended to impact flying and swimming. Where being overburdened leads to sinking, descending and sometimes falling. The nomenclature of encumbrance has changed as well: Free, Light, Normal, and Burdened are the encumbrance categories. Much more approachable than unencumbered and over-encumbered. A Max Lift amount was added.
If you can’t make something work in Python then maybe the written rule is too precious.