code: def delete_file(self, key, shallow=True):
      raise NotImplementedError("Not implemented: delete_file")
  
imports: import os
  import uuid
  import time
  from typing import Dict
  from studio.storage.storage_type import StorageType
  from studio.util.util import get_temp_filename, check_for_kb_interrupt
label_desc: Use image node_id 6 for calling the StorageHandler obj's underlying member method code with example usage: obj.delete_file(key, shallow) without return types