code: def retrieve_blob(self, key, encoding=None):
          ''' Retrieve blob in binary format (or string format if encoding is provided) '''
          blob_key = self.__retrieve(key)
          if blob_key is None:
              return None
          if not blob_key:
              raise Exception("Invalid blob_key")
          elif blob_key == JiCache.INTERNAL_BLOB:
              blob_data = self.__retrieve_internal_blob(key)
              return blob_data if not encoding else blob_data.decode(encoding)
          else:
              getLogger().debug("Key[{key}] -> [{blob_key}]".format(key=key, blob_key=blob_key))
              blob_file = os.path.join(self.blob_location, blob_key)
              return FileHelper.read(blob_filef retrieve_blob(self, key, encoding=None):
          ''' Retrieve blob in binary format (or string format if encoding is provided) '''
          blob_key = self.__retrieve(key)
          if blob_key is None:
              return None
          if not blob_key:
              raise Exception("Invalid blob_key")
          elif blob_key == JiCache.INTERNAL_BLOB:
              blob_data = self.__retrieve_internal_blob(key)
              return blob_data if not encoding else blob_data.decode(encoding)
          else:
              getLogger().debug("Key[{key}] -> [{blob_key}]".format(key=key, blob_key=blob_key))
              blob_file = os.path.join(self.blob_location, blob_key)
              return FileHelper.read(blob_file)
docs: Retrieve blob in binary format (or string format if encoding is provided)