New submission from Olli <mrblueskie...@gmail.com>:
When rounding numbers with round(), middle values at with even base number are rounded in wrong direction. Python 3.9.1 (default, Feb 3 2021, 07:38:02) [Clang 12.0.0 (clang-1200.0.32.29)] on darwin MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports) macOS 11.2.3 (20D91), Darwin 20.3.0 to reproduce (wrong results marked with "*"): floats: >>> for i in range(0, 10): ... i /= 2 ... print(i, '->', round(i)) ... 0.0 -> 0 0.5 -> 0 * 1.0 -> 1 1.5 -> 2 2.0 -> 2 2.5 -> 2 * 3.0 -> 3 3.5 -> 4 4.0 -> 4 4.5 -> 4 * and for ints: >>> for i in range(50, 1000, 50): ... print(i, '->', round(int(i), -2)) ... 50 -> 0 * 100 -> 100 150 -> 200 200 -> 200 250 -> 200 * 300 -> 300 350 -> 400 400 -> 400 450 -> 400 * 500 -> 500 550 -> 600 600 -> 600 650 -> 600 * 700 -> 700 750 -> 800 800 -> 800 850 -> 800 * 900 -> 900 950 -> 1000 ---------- components: Library (Lib) messages: 391499 nosy: MrBlueSkies priority: normal severity: normal status: open title: round() produces incorrect results with certain values type: behavior versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43903> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
