Return the classic iris data in a nice package.

def iris(display=False):
    """ Return the classic iris data in a nice package. """

    d = sklearn.datasets.load_iris()
    df = pd.DataFrame(data=d.data, columns=d.feature_names) # pylint: disable=E1101
    if display:
        return df, [d.target_names[v] for v in d.target] # pylint: disable=E1101
    else:
        return df, d.target