On Thu, Jul 17, 2014 at 1:10 PM, Marko Rauhamaa <ma...@pacujo.net> wrote: > Mathematically, there are undefined operations, for a good reason. > That's because the limits are not unambiguous and that's why 0/0, 0**0, > 1/0 and inf-inf are undefined.
Well, 0**0 is usually defined as 1, despite the limits being ambiguous. Also, 1/0 in IEEE 754 is defined as inf. > Why 0/0 results in an exception but inf-inf = nan, I don't see a > justification. I expect that float division by zero was made to raise an exception for consistency with integer division by zero, where it might be considered inappropriate to switch types and return inf or nan. Granted that nowadays integer division returns a float anyway, but there is still floor division to think about. Maybe this should have been fixed in Python 3, but it wasn't. -- https://mail.python.org/mailman/listinfo/python-list
