Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:
On Thu, Nov 5, 2009 at 2:16 PM, Raymond Hettinger <rep...@bugs.python.org> wrote: > > Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment: > > The basic problem here is that the "one obvious way" to some people > (including me and Martin v. Löwis) is to use a dictionary. Further, > there is the problem of conflating types in a user's mind -- right now, > dictionaries are all about looking up and returning values, while sets > are not. One feature that is missing from both dict approach and get_equivalent recipe is the ability to do interning of new values with a single lookup. Note that even at the C level one has to first try to retrieve the key from the dictionary and then if that fails, do an insert which repeats the same lookup. Even dict.setdefault which is designed to remove the double lookup while eliminates it when key is present, still does the second lookup when the key is missing. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue7224> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
