mantissa and exponent in base 10

[Ulrich Eckhardt]

Steven D'Aprano wrote:
> I want the mantissa and decimal exponent of a float, in base 10:
> 
> mantissa and exponent of 1.2345e7
> => (1.2345, 7)
> 
> (0.12345, 8) would also be acceptable.
[...]
> Have I missed a built-in or math function somewhere?

The integral, decimal exponent is just the floor/ceiling of log10 of that
number.

Uli

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