Rounding up to the nearest exact logarithmic decade

[Grant Edwards]

On 2006-02-28, jao at geophile.com <jao at geophile.com> wrote:
> Quoting Derek Basch <dbasch at yahoo.com>:
>
>> Given a value (x) that is within the range (1e-1, 1e7) how do I round
>> (x) up to the closest exact logarithmic decade? For instance:
>
> How about this:
>
> def roundup(x):
>     if x < 1:
>         return 1
>     else:
>         return '1' + ('0' * len(str(int(x))))

Interesting approach.  You're converting to string at the same
time.  I would guess the OP wanted a float.

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