On Thu, Jul 26, 2018 at 2:14 AM, Schachner, Joseph <joseph.schach...@teledyne.com> wrote: > While I appreciate that use of "is" in thing is None, I claim this relies > on knowledge of how Python works internally, to know that every None actually > is the same ID (the same object) - it is singular.
That's part of the *definition* of None. It is a singleton. There is only one None. > That probably works for 0 and 1 also but you probably wouldn't consider > testing thing is 1, at least I hope you wouldn't. thing is None looks just > as odd to me. Why not thing == None ? That works. > That's not guaranteed, because integers are not guaranteed to be singletons. They're compared by value. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
