For dynamic variable access you do what PyPy (the python interpreter) does for globals. You indeed fall back to a dict, but you keep a dict of cells, that is in

For dynamic variable access you do what PyPy (the python interpreter) does for globals. You indeed fall back to a dict, but you keep a dict of cells, that is indexes in the list, not the dict of variables. That way you have extra indirection, but all accesses that are static are efficient, even if you have a dynamic access somewhere (which indeed need to do a lookup, but too bad). I fear this is not the best place to discuss further though, you have my mail.