Nicko van Someren schrieb: > It's only a semantic change on platforms that "happen to" use IEEE > 754 float representations, or some other representation that exposes > the sign of zero.
Right. Later, you admit that this is vast majority of modern machines. > It would be instructive to understand how much, if any, python code > would break if we lost -0.0. I'm do not believe that there is any > reliable way for python code to tell the difference between all of > the different types of IEEE 754 zeros and in the special case of -0.0 > the best test I can come up with is repr(n)[0]=='-'. Is there an > compelling case, to do with compatibility or otherwise, for exposing > the sign of a zero? It seems like a numerical anomaly to me. I think it is reasonable to admit that a) this change is a change in semantics for the majority of the machines b) it is likely that this change won't affect a significant number of applications (I'm pretty sure someone will notice, though; someone always notices). 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
