An AskSage
question<http://ask.sagemath.org/question/1467/why-is-3e1-not-equivalent-to-30>
brings
up a good point: shouldn't scientific notation work for integers? 3e1
returns a RealLiteral, not an Integer. Python also does this; 3e1 is a
float. But wouldn't it be better if the preparser detected whether the
output will be an integer, and if so, cast it as such? All it would have to
do is check whether the exponent was greater or equal to the length of the
decimal part of the coefficient. For example:
def integral_scientific(num):
coefficient, exponent = num.split('e')
if RealNumber(exponent) >= (len(coefficient.split('.')[1]) if '.' in
coefficient else 0):
return Integer(RealNumber(coefficient) * 10 ** Integer(exponent))
else:
return RealNumber(coefficient) * 10 ** Integer(exponent)
sage: integral_scientific('3.33e10')
33300000000
sage: integral_scientific('3.33e1')
33.3000000000000
sage: integral_scientific('3.00e1')
30.0000000000000
sage: integral_scientific('3543e1')
35430
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