def __init__(self, rows):
        super().__init__(Row(r) for r in rows)
        if 1 < len(self):
            raise ValueError('Table must have at least one row.')
        self.width = self.check_width()
dataset/ETHPy150Open fluentpython/example-code/attic/sequences/table.py/Table.__init__/swapped operands of `<`