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Created on 2009-06-03 13:20 by Zero, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Messages (3) | |||
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| msg88808 - (view) | Author: Stephen Paul Chappell (Zero) | Date: 2009-06-03 13:19 | |
This is what I get while the interactive interpreter (IDLE 3.0.1) on the platform Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit (Intel)] on win32 >>> a = -6.276479035564047 >>> b = -5.7974497499584849 >>> a ** b != -6.276479035564047 ** -5.7974497499584849 True >>> Something is wrong. The float values are the same but not evaluated as being equal. After writing an automated testing program, these sample numbers were generated and found to create erroneous symptoms in the system being automatically tested. |
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| msg88809 - (view) | Author: Jean-Paul Calderone (exarkun) *  |
Date: 2009-06-03 13:27 | |
Have you checked to see what the result of a ** b is? |
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| msg88811 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2009-06-03 13:30 | |
This is not a bug: Python's operator precedence rules mean that the expression -6.276479035564047 ** -5.7974497499584849 is treated as: -(6.276479035564047 ** -5.7974497499584849). >>> a = -6.276479035564047 >>> b = -5.7974497499584849 >>> a ** b != -6.276479035564047 ** -5.7974497499584849 True >>> a ** b == (-6.276479035564047) ** -5.7974497499584849 True |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:49 | admin | set | github: 50438 |
| 2019-10-31 14:23:36 | Zero | set | nosy:
- Zero |
| 2009-06-03 13:30:48 | mark.dickinson | set | status: open -> closed nosy: + mark.dickinson messages: + msg88811 resolution: not a bug |
| 2009-06-03 13:27:17 | exarkun | set | nosy:
+ exarkun messages: + msg88809 |
| 2009-06-03 13:20:01 | Zero | create | |