Comment #3 on issue 2100 by smichr: nsimplify rarely works without setting the tolerance flag
http://code.google.com/p/sympy/issues/detail?id=2100
It's not hard if you take the str() of it which generally does rounding to get rid of spurious 9.. and ..01 and check the number of digits that remain. Those plus the log(n, 10) will give you the total number of digits entered.
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