Brian Harring schrieb: > For dict; it actually *cannot* work. You can't remove keys from a > dict as you're iterating over it (can change the val of a key, but not > remove the key).
I think this is incorrect. The implementation could well support it, putting a dummy object into the deleted key (which deletion needs to do, anyway). > So iter.delete would require fair bit of changes > internally to dict, either tracking what it's yielded already, or > forcing iterkeys to actually be iter(keys()) (creating an intermediate > list), which is worse for memory usage and general performance. I don't think either is necessary; deletion could occur "directly". > Set's suffer the same thing; can't change what it contains while > iterating, have to restart the iteration after a removal/addition. Again, I think that's incorrect. > Tuples are immutable, so end of discusion there. True. > Now... occasionally, have to do it admittedly. But it's not something > you actaully want to be doing in your code all that much- admittedly > generating a new list to avoid that hit also sucks somewhat, but the > worst case there is far more behaved, a temp trade of space vs > runtime. Also true. Regards, Martin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
