def data_source_and_uncertainty_flags(self, value=None):
        """Corresponds to IDD Field `data_source_and_uncertainty_flags` Initial
        day of weather file is checked by EnergyPlus for validity (as shown
        below) Each field is checked for "missing" as shown below. Reasonable
        values, calculated values or the last "good" value is substituted.

        Args:
            value (str): value for IDD Field `data_source_and_uncertainty_flags`
                if `value` is None it will not be checked against the
                specification and is assumed to be a missing value

        Raises:
            ValueError: if `value` is not a valid value

        """
        if value is not None:
            try:
                value = str(value)
            except ValueError:
                raise ValueError(
                    'value {} need to be of type str '
                    'for field `data_source_and_uncertainty_flags`'.format(value))
            if ',' in value:
                raise ValueError(
                    'value should not contain a comma '
                    'for field `data_source_and_uncertainty_flags`')

        self._data_source_and_uncertainty_flags = value
Corresponds to IDD Field `data_source_and_uncertainty_flags` Initial
        day of weather file is checked by EnergyPlus for validity (as shown
        below) Each field is checked for "missing" as shown below. Reasonable
        values, calculated values or the last "good" value is substituted.

        Args:
            value (str): value for IDD Field `data_source_and_uncertainty_flags`
                if `value` is None it will not be checked against the
                specification and is assumed to be a missing value

        Raises:
            ValueError: if `value` is not a valid value