floating point mystery

[Opinderjit]

A prior discussion has already answered by question. So, please ignore.

In article <8qimpv$60c$1 at nnrp1.deja.com>,
  Opinderjit <bhellao at my-deja.com> wrote:
> Why does the following happen on the Windows version of Python? There
> must be a reason for this. Does anybody know?
> I am not sure if this happens on any other platform.
>
> Version 1.5.2 is as I would expect.
> >>> 8572.85
> 8572.85
>
> Version 1.6, why a '4' at the end
> >>> 8572.85
> 8572.8500000000004
>
> Version 2.0b, why a '4' at the end
> >>> 8572.85
> 8572.8500000000004
>
> Also on version 1.6,
> >>> 1.23
> 1.23
> >>> 2.23
> 2.23
> >>> 3.23
> 3.23
> >>> 4.23
> 4.2300000000000004
>
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> Before you buy.
>


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Before you buy.