Raymond Hettinger <pyt...@rcn.com> wrote: > > if not round(x - y, 6): ...
That's a dangerous suggestion. It only works if x and y happen to be roughly in the range of integers. For example, here x and y are within roundoff error of each other, but round doesn't know it: >>> x=1e32 >>> y=x+1e16 >>> x-y -18014398509481984.0 >>> round(x-y,6) -18014398509481984.0 It fails in the other direction when the numbers are small: >>> x=.0000000123 >>> y=.0000000234 >>> x-y -1.1100000000000002e-008 >>> round(x-y,6) 0.0 Mark's solution is the generically correct one, which takes into account the rough range of the values. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
