On Mon, 14 Mar 2011 12:10:27 +0100, Jean-Michel Pichavant wrote: > Steven D'Aprano wrote: >> The removal of cmp from the sort method of lists is probably the most >> disliked change in Python 3. On the python-dev mailing list at the >> moment, Guido is considering whether or not it was a mistake. >> >> If anyone has any use-cases for sorting with a comparison function that >> either can't be written using a key function, or that perform really >> badly when done so, this would be a good time to speak up. >> >> >> >> > You seem concerned by this removal, do you have any use-case ?
You seem concerned by my concern. Why do you think I am concerned? (1) I'm not concerned, but many people are. If you search the archives of this newsgroup (mailing list), you'll see that I have defended the removal of cmp from sort, e.g. this post: http://www.mail-archive.com/python-list%40python.org/msg261728.html (2) If I had a good use-case for keeping cmp, I wouldn't need to ask others if they had a good use-case. As it is, Guido himself has mentioned one such good use for a comparison function when sorting. Use of a key function trades off memory for time, while sorting with a comparison function makes the opposite trade off, using more time for the sake of saving memory. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
