Sandboxing eval()

[inhahe]

> I have written a simple parser/evaluator that is sufficient for my
> simple requirements, and I thought I was safe.
>
> Then I saw this comment in a recent post by Robin Becker of ReportLab -
>
>      "avoiding simple things like ' '*(10**200) seems quite difficult"
>
> I realised that my method is vulnerable to this  and, like Robin, I have
> not come up with an easy way to guard against it.
>
> Frank Millman
>
>
Just use floats instead of integers.