[PyBo]
> What's wrong with this picture?
>
> >>> x = 500000000.0
> >>> y = x / (1024 * 1024)
> >>> y
> 476.837158203125
> >>> z = round(y, 2)
> >>> z
> 476.83999999999997
What's wrong is that you haven't yet read the Python tutorial's
appendix on floating-point issues. That much is easily repaired
<wink>:
http://docs.python.org/tut/node15.html