is this data structure build-in or I'll have to write my own class?

[Jorge Vargas]

I need a data structure that will let me do:

- attribute access (or index)
- maintain the order (for iter and print)
- be mutable.

in case there isn't one. I was thinking having a base class like Bunch
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52308 and on
top of that keeping a list of the keys and pop/push to the list when
adding/deleting items. I don't like this idea because I'll have to
keep each key twice. (in the list and in __dict__, is this the only
way of doing it?