[Python-3000] Warning for 2.6 and greater

[Giovanni Bajo]

Anthony Baxter wrote:

> I'm not sure whether we should try and warn about 'print' becoming a 
> function. We should also consider things like intern() and 
> compile() (if they are to move to sys).

I think it's fine if we prepare an upgrade path: for instance, we could add 
sys.intern() and sys.compile() to 2.6, and warn only if the builtin version is 
used.

In other words, I think it's important always to provide a way to "fix the 
code" so that -W py3k is happy *and* it still works on the Python 2.x serie.
-- 
Giovanni Bajo