[e12e]

I don't think python without heterogenous lists and dictionaries is really python?

[linuxftw]

I can't think of a time I ever needed to do such a thing, and I've written many thousand lines of python. Python supports OOP, so classes will get you quite far in this regard.

[e12e]

Wouldn't that exclude (most) nested lists?

[linuxftw]

What do you mean by nested lists? A list of lists, that's a list with a single type.

[e12e]

I was thinking more a tree-like structure, with lists or values.