class_docstr: StorageHandler that uses Redis as backend. 
code: def _set(self, serialized_key, serialized_value):
      self.connection.set(serialized_key, serialized_value)
  
imports: import os
  import dill
  import pickle
  from typing import Dict
  from hashlib import md5
  import redis
  import sqlite3
label_desc: Use image node_id 3 for calling the RedisStorageHandler obj's underlying member method code with example usage: obj._set(serialized_key, serialized_value) without return types