Sets the unit of this Dimensions.


        :param unit: The unit of this Dimensions.
        :type: str

def unit(self, unit):
        """Sets the unit of this Dimensions.


        :param unit: The unit of this Dimensions.
        :type: str
        """
        allowed_values = ["cm", "inch", "foot"]  # noqa: E501
        if unit is not None and unit not in allowed_values:
            raise ValueError(
                "Invalid value for `unit` ({0}), must be one of {1}"  # noqa: E501
                .format(unit, allowed_values)
            )

        self._unit = unit