def from_years_range(start_year, end_year):
        """Transform a range of years (two ints) to a DateRange object."""
        start = datetime.date(start_year, 1 , 1)
        end = datetime.date(end_year, 12 , 31)
        return DateRange(start, end)
Transform a range of years (two ints) to a DateRange object.