Grasshopper IronPython 2.7

Target platform: Rhinoceros 7 + Grasshopper 1 with the built-in IronPython 2.7 interpreter. All API signatures, return types, and method names in this skill are verified against the RhinoCommon 7.x SDK. Rhino 8 ships with both IronPython 2.7 (legacy) and CPython 3 — if you are targeting Rhino 8 CPython, many constraints in the Hard Constraints section do not apply.

Hard Constraints (IronPython 2.7)

These will cause runtime errors — never use them: