March 23, 2010
6:55 p.m.
On Tue, Mar 23, 2010 at 6:07 PM, Adam Olsen <rhamph@gmail.com> wrote:
On Tue, Mar 23, 2010 at 12:04, Mark Dickinson <dickinsm@gmail.com> wrote:
Note that containment tests check identity before equality, so there's no problem with putting (float) nans in sets or dicts:
x = float('nan') s = {x} x in s True
Ergh, I thought that got changed. Nevermind then.
Hmm. I think you're right: it did get changed at some point early in py3k's history; I seem to recall that the identity-checking behaviour got restored before 3.1 was released, though. There was an issue about this somewhere, but I'm failing to find it. Mark