def _check_wb_years(year: int):
    'Check that year is in world bank dataset years.'
    if (year < 1960):
        raise ValueError('year value must be 1960 or later')
Check that year is in world bank dataset years.
def _check_wb_years(year: int):
    
    if (year < 1960):
        raise ValueError('year value must be 1960 or later')