I guess it's my anti-Scheme attitude. I just think the problem is in the deeply nested structures. There usually is a less nested data structure that doesn't have the problem.
and then he says:
Well, unclear. Frame chains make sense as chains because they are reference-counted individually.
which surely goes to show that sometimes it *does* make sense to use a deeply nested structure?
Well, without deeply nested data structures the stack wouldn't be that deep, would it? :-)
--Guido van Rossum (home page: http://www.python.org/%7Eguido/)