[Python-ideas] Create a StringBuilder class and use it everywhere

[k_bx]

Ok, so while I think that cStringIO.StringIO is not what we shoud use, io.StringIO should be okay (since it wasn't explpicitly created to be file-like), so there's no reason not to use that (and it performs good, on pypy also) ((except that I don't like it's API, of course)).

Thanks everyone!

p.s.: it seems people read code much more often then they do read FAQ