Tim Peters wrote:
> [Raymond Hettinger]
>>>>>from decimal import getcontext, Decimal as D
>>>>>getcontext().prec = 3
>>>>>D('3.104') + D('2.104')
>>
>>Decimal("5.21")
>>
>>>>>D('3.104') + D('0.000') + D('2.104')
>>
>>Decimal("5.20")
>
> the results differ here because D(whatever)
> ignores context settings; having a common operation ignore context is
> ugly and error-prone).
I don't see it's because of that. Even if D(whatever)
didn't ignore the context settings, you'd get the same
oddity if the numbers came from somewhere else with a
different precision.
I'm very uncomfortable about the whole idea of a
context-dependent precision. It just seems to be
asking for trouble.
--
Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury, | A citizen of NewZealandCorp, a |
Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. |
[EMAIL PROTECTED] +--------------------------------------+
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