Please don't reopen this. There are good reasons for 'set' to be the default set type and 'frozenset' to appear like a poor cousin. For one, their naming. This was all reasoned out long, long ago, in Python 2.3 with the sets module. If you insist I will try to write it up all again, but I'd rather you believe that we weren't crazy back then. Raymond's about-face suggests that there are plenty of dead alleys that lead the traveler astray by appearing to be a shortcut to their destination.
--Guido On Jan 27, 2008 9:38 PM, Greg Ewing <[EMAIL PROTECTED]> wrote: > Guido van Rossum wrote: > > On Jan 26, 2008 8:39 PM, Raymond Hettinger <[EMAIL PROTECTED]> wrote: > > > >>However, my support for it has waned anyway. The notation is also > >>used for set comprehension and those should be mutable. > > > > Cool. That saves us a PEP. Vive le status quo. > > You're changing your mind back again just like that? That's > disappointing -- I was fairly convinced there as well. > > Another possibility would be to drop set comprehension > syntax and just require people to use set(genexp). > > Or have set comprehensions produce frozensets and require > set(genexp) to get a mutable set. > > On the face of it, it's not clear to me that the result of > a set comprehension should necessarily be mutable. > > When I think about how I have used list comprehensions, > mutability of the resulting list isn't usually a requirement. > I don't expect this would be different with sets. > > -- > Greg > > _______________________________________________ > Python-3000 mailing list > Python-3000@python.org > http://mail.python.org/mailman/listinfo/python-3000 > Unsubscribe: > http://mail.python.org/mailman/options/python-3000/guido%40python.org > -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
