Issue 7323: decimal.Decimal greater than/less than sometimes gives wrong answers when comparing to floats. (original) (raw)

Issue7323

Created on 2009-11-14 18:39 by adamtj, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (3)
msg95248 - (view)	Author: Adam Tomjack (adamtj)	Date: 2009-11-14 18:39
These should all return False, or some of them should raise exceptions: Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18) [GCC 4.3.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import decimal >>> decimal.Decimal('0') > 0 False >>> decimal.Decimal('0') < 0 False >>> decimal.Decimal('0') > 0.0 True >>> decimal.Decimal('0') < 0.0 False >>> 0.0 > decimal.Decimal('0') False >>> 0.0 < decimal.Decimal('0') True >>> 0.0 < decimal.Decimal('0.0') True >>> decimal.Decimal('0') > decimal.Decimal('0') False
msg95262 - (view)	Author: Mark Dickinson (mark.dickinson) *	Date: 2009-11-14 22:20
Unfortunately there's no easy way to fix this in 2.x, where any object is supposed to be comparable with any other. See issue 2531 for a previous discussion. It's fixed in 3.x: there a comparison (other than ==, !=) between a float and a Decimal does raise an exception. Closing as a duplicate of issue 2531. Issue 2531 is also closed, but you should feel free to add to the discussion there.
msg95264 - (view)	Author: Mark Dickinson (mark.dickinson) *	Date: 2009-11-14 22:39
I've re-opened issue 2531: some recent changes (in particular, the backport of the 3.x float <-> string conversions to 2.x) may make previously rejected solutions viable again.