class_docstr: A single LookupTable instance.
  
  LookupTables offer a standardized interface, backed by the PersistenceDriver system in
  the background.
code: def driver_type(self):
      return self._driver.driver_type
  
file_path: streamalert/streamalert/shared/lookup_tables/table.py
imports: from streamalert.shared.logger import get_logger
label_desc: Use image node_id 4 for calling the LookupTable obj's underlying member method code with example usage: obj.driver_type() and returns: self