docstr: Retrieves a key
docstr_tok: ["Retrieves","a","key"]
code: def get(self, key, default=None):
      """Retrieves a key"""
  
imports: from abc import abstractmethod, ABCMeta
  from streamalert.shared.logger import get_logger
label_desc: Use image node_id 6 for calling the PersistenceDriver obj's underlying member method code with example usage: obj.get(key, default) without return types