Alex Martelli wrote: > > I'd love a read-only dictionary (AND a read-only list) for reasons having > little to do with optimization, actually [...] Me too! It would be very useful for secure Python -- I could pass my list to some without risking that it mutates my list. Without RO-lists I have to make a copy of my list every time I want to show it to someone. Regards, Zooko http://zooko.com/