code: def severity(self, severity):
          
          if severity is None:
              raise ValueError("Invalid value for `severity`, must not be `None`")  # noqa: E501
          allowed_values = ["MARKETING", "INFO", "WARN", "SEVERE"]  # noqa: E501
          if severity not in allowed_values:
              raise ValueError(
                  "Invalid value for `severity` ({0}), must be one of {1}"  # noqa: E501
                  .format(severity, allowed_values)
              )
  
          self._severity = severity
docs: Sets the severity of this Message.
  
          Message severity  # noqa: E501
  
          :param severity: The severity of this Message.  # noqa: E501
          :type: str