code: def sparkline_size(self, sparkline_size):
          
          allowed_values = ["BACKGROUND", "BOTTOM", "NONE"]  # noqa: E501
          if sparkline_size not in allowed_values:
              raise ValueError(
                  "Invalid value for `sparkline_size` ({0}), must be one of {1}"  # noqa: E501
                  .format(sparkline_size, allowed_values)
              )
  
          self._sparkline_size = sparkline_size
docs: Sets the sparkline_size of this ChartSettings.
  
          For the single stat view, a misleadingly named property.  This determines whether the sparkline of the statistic is displayed in the chart BACKGROUND, BOTTOM, or NONE  # noqa: E501
  
          :param sparkline_size: The sparkline_size of this ChartSettings.  # noqa: E501
          :type: str