class_docstr: Basic interface that reads and writes bytes
docstr: Returns True if the stream is closed or False otherwise
  
  Returns
  -------
  bool
      True if closed or False otherwise
code: def is_closed(self):
      """
      Returns True if the stream is closed or False otherwise
  
      Returns
      -------
      bool
          True if closed or False otherwise
      """
      raise NotImplementedError()
  
file_path: metaflow/metaflow/plugins/env_escape/communication/bytestream.py
label_desc: Use image node_id 4 for calling the ByteStream obj's underlying member method code with example usage: obj.is_closed() without return types