class_docstr: Ephemeral persistence driver
  
  This persistence driver does not actually store data anywhere--it just keeps it in memory.
class_docstr_tok: ["Ephemeral","persistence","driver","This","persistence","driver","does","not","actually","store","data","anywhere","--","it","just","keeps","it","in","memory","."]
code: def get(self, key, default=None):
      return self._cache.get(key, default)
  
imports: from abc import abstractmethod, ABCMeta
  from streamalert.shared.logger import get_logger
label_desc: Use image node_id 6 for calling the EphemeralDriver obj's underlying member method code with example usage: obj.get(key, default) and returns: self