'Create a ``dict`` of columns from a Pandas GroupBy,
suitable for creating a ColumnDataSource.
The data generated is the result of running ``describe``
on the group.
Args:
group (GroupBy) : data to convert
Returns:
dict[str, np.array]'

@staticmethod
def _data_from_groupby(group):

    return ColumnDataSource._data_from_df(group.describe())
