I don't think the target audience of Python are second-graders, but rather people who have graduated elementary school and realise that 1/2 comes out to 0.5.
That's silly, in math those two are just different notations for the same thing, and usually fractions are preferred.
Also anyone who's done any bit of programming should know that numbers as represented by a computer are discrete, while mathematics deal with symbolic relations which might require infinite amount of data to numerically represent.
