New submission from Mark Dickinson: The documentation for the builtin round(x, n) says:
"Values are rounded to the closest multiple of 10 to the power minus n." This isn't always true; for example: Python 2.6a0 (trunk:59634M, Dec 31 2007, 17:27:56) [GCC 4.0.1 (Apple Computer, Inc. build 5370)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> round(562949953421312.5, 1) 562949953421312.62 Here 562949953421312.5 is exactly representable as an IEEE754 double, so the output from the round function should be exactly the same as the input. Assigning this to myself to remind me to try to fix it someday. ---------- assignee: marketdickinson messages: 60129 nosy: marketdickinson priority: low severity: minor status: open title: Builtin round function is sometimes inaccurate for floats type: behavior versions: Python 2.5, Python 2.6, Python 3.0 __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue1869> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
