[Python-3000] Iterators for dict keys, values, and items == annoying :)

[Greg Ewing]

Aahz wrote:

> What do we want to tell people who have code like this:
> 
> keys = d.keys()
> keys.sort()

I think the view returned in this case should be
immutable, so that the above fails. Then we tell
them to replace it with

   keys = sorted(d.keys())

In general, where we're changing the semantics of
an existing method to return a view instead of a
new object, the view returned should be immutable.

--
Greg