Using Functions in CPy2Py

Functions are lightweight, callable cousing of objects:

• plain functions, behaving like object instances
• twinfunction(), behaving like TwinObject

Normal functions live separately in each twinterpreter, and passing them between twinterpreters creates clones. A twinfunction() can be passed around transparently; unlike a TwinObject, this only affects its nature as being callable. Other actions, such as assigning attributes, are not transparent across twinterpreters.