def get_next_value(self, dateval):
        smallest = None
        for expr in self.expressions:
            value = expr.get_next_value(dateval, self)
            if smallest is None or (value is not None and value < smallest):
                smallest = value

        return smallest
dataset/ETHPy150Open agronholm/apscheduler/apscheduler/triggers/cron/fields.py/BaseField.get_next_value/original