def is_being_cached(self, image_id):
        path = self.get_image_filepath(image_id, 'incomplete')
        return os.path.exists(path)
Describing an enumerated column from an enumeration.
dataset/ETHPy150Open rcbops/glance-buildpackage/glance/image_cache/drivers/sqlite.py/Driver.is_being_cached--crossover with--dataset/ETHPy150Open PyTables/PyTables/tables/tests/test_enum.py/CreateColTestCase.test00a_validFromEnum