On Jul 26, 11:24 am, John Nagle <na...@animats.com> wrote: > A tuple is really a frozen list. Arguably, frozen objects > should have been a general concept. Conceptually, they're > simple - once "__init__" has run, there can be no more changes > to fields of the object.
I would argue that freezing and thawing (making the container statefull) is the proverbial road to hell paved with good intentions. It is roughly in the same category as dynamic scoping -- programs become harder to analyze for correctness -- code that used to work can break because something froze it along the way (perhaps to use it as a key for dict or set in a caching function) or because something unfroze it (so it could mutate a value). Raymond -- http://mail.python.org/mailman/listinfo/python-list
