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Created on 2021-11-04 15:31 by jacekblaz, last changed 2022-04-11 14:59 by admin. This issue is now closed.
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| msg405726 - (view) | Author: Jacek (jacekblaz) | Date: 2021-11-04 15:31 | |
round(2500, -3) returns 2000 instead of 3000. I have checked it on 3.7.4 and 3.6.9. |
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| msg405733 - (view) | Author: Dennis Sweeney (Dennis Sweeney) *  |
Date: 2021-11-04 16:09 | |
Thanks for the report, but this is the intended behavior. From https://docs.python.org/3/library/functions.html#round : """values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice (so, for example, both round(0.5) and round(-0.5) are 0, and round(1.5) is 2)""" This is called "round-half-to-even" or "Banker's rounding" (see https://en.wikipedia.org/wiki/Rounding#Round_half_to_even) and it's used to prevent the upward bias that would happen if we always rounded halfway points up. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:52 | admin | set | github: 89878 |
| 2021-11-04 16:09:23 | Dennis Sweeney | set | status: open -> closed nosy: + Dennis Sweeney messages: + msg405733 resolution: not a bug stage: resolved |
| 2021-11-04 15:31:24 | jacekblaz | create | |