Forget about the previous mail, i just saw you were converting the string to float beforehand, in which case he would more than likely run into the good ol' float imprecision issue sooner than later.
Not to mention that %g formats to scientific notation (e.g. exponential format with the exponent always being a multiple of 3), he'd probably use "%f". -- http://mail.python.org/mailman/listinfo/python-list
