This is out of date, 3/2 is 1.5 in latest python. I don't know what you mean by built in support for missing data but at language level there is None and in nu

This is out of date, 3/2 is 1.5 in latest python. I don't know what you mean by built in support for missing data but at language level there is None and in numpy/pandas there is np.NaN