def validate_column_name()

in python/prophet/forecaster.py [0:0]


    def validate_column_name(self, name, check_holidays=True,
                             check_seasonalities=True, check_regressors=True):
        """Validates the name of a seasonality, holiday, or regressor.

        Parameters
        ----------
        name: string
        check_holidays: bool check if name already used for holiday
        check_seasonalities: bool check if name already used for seasonality
        check_regressors: bool check if name already used for regressor
        """
        if '_delim_' in name:
            raise ValueError('Name cannot contain "_delim_"')
        reserved_names = [
            'trend', 'additive_terms', 'daily', 'weekly', 'yearly',
            'holidays', 'zeros', 'extra_regressors_additive', 'yhat',
            'extra_regressors_multiplicative', 'multiplicative_terms',
        ]
        rn_l = [n + '_lower' for n in reserved_names]
        rn_u = [n + '_upper' for n in reserved_names]
        reserved_names.extend(rn_l)
        reserved_names.extend(rn_u)
        reserved_names.extend([
            'ds', 'y', 'cap', 'floor', 'y_scaled', 'cap_scaled'])
        if name in reserved_names:
            raise ValueError(
                'Name {name!r} is reserved.'.format(name=name)
            )
        if (check_holidays and self.holidays is not None and
                name in self.holidays['holiday'].unique()):
            raise ValueError(
                'Name {name!r} already used for a holiday.'.format(name=name)
            )
        if (check_holidays and self.country_holidays is not None and
                name in get_holiday_names(self.country_holidays)):
            raise ValueError(
                'Name {name!r} is a holiday name in {country_holidays}.'
                .format(name=name, country_holidays=self.country_holidays)
            )
        if check_seasonalities and name in self.seasonalities:
            raise ValueError(
                'Name {name!r} already used for a seasonality.'
                .format(name=name)
            )
        if check_regressors and name in self.extra_regressors:
            raise ValueError(
                'Name {name!r} already used for an added regressor.'
                .format(name=name)
            )