@property
    def key_fields(self):
        if self.add:
            return ['date', 'elem']
        else:
            return ['date']
Find and return the path of the first config file that exists
dataset/ETHPy150Open heigeo/climata/climata/acis/__init__.py/DataIO.key_fields--crossover with--dataset/ETHPy150Open SUSE/azurectl/azurectl/config/file_path.py/ConfigFilePath.default_config