On Mon, 27 May 2013 13:11:28 -0700, Ahmed Abdulshafy wrote: > On Sunday, May 26, 2013 2:13:47 PM UTC+2, Steven D'Aprano wrote: > >> What the above actually tests for is whether x is so small that (1.0+x) >> cannot be distinguished from 1.0, which is not the same thing. It is >> also quite arbitrary. Why 1.0? Why not (0.0001+x)? Or (0.00000001+x)? >> Or (10000.0+x)? > > That may be true for integers,
What may be true for integers? > but for floats, testing for equality is not always precise And your point is? What Steven wrote is entirely correct: sys.float_info.epsilon is the smallest value x such that 1.0 and 1.0+x have distinct floating-point representations. It has no relevance for comparing to zero. -- http://mail.python.org/mailman/listinfo/python-list