Decimal arithmetic, was Re: Python GUI app to impress the boss?

[Dennis Lee Bieber]

Chris Gonnerman fed this fish to the penguins on Tuesday 01 October 
2002 08:11 pm:


> My only complaint is that the fixedpoint.py module does
> only banker's rounding.  Bah.  I do have bank customers,
> but they don't let me handle their math (it's done in
> true, old-fashioned BCD as far as I can tell).  Most of
> my business customers do the >= 0.5 up, < 0.5 down form
> they learned in school... so what I need is a math library
> that does it that way without losing or gaining
> "unexpected" pennies along the way.
>
        Okay, and which way should it do  -0.5? Is that rounded to 0.0 or -1.0?

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