code: def _open(
      self,
      path: str,
      mode: str = "r",
      buffer_size: int = 8192,
      use_codec: bool = False,
  ):
      handle: Union[io.BufferedReader, io.BufferedWriter]
      if "r" in mode:
          handle = io.BufferedReader(
              HadoopReader(
                  self, path, buffer_size, use_codec=use_codec
              ),
              buffer_size=buffer_size,
          )
      elif "w" in mode:
          handle = io.BufferedWriter(
              HadoopWriter(self, path, use_codec=use_codec),
              buffer_size=buffer_size,
          )
      elif "x" in mode:
          handle = io.BufferedWriter(
              HadoopWriter(
                  self, path, exclusive=True, use_codec=use_codec
              ),
              buffer_size=buffer_size,
          )
  
      if "b" in mode:
          return handle
      else:
          return io.TextIOWrapper(handle, encoding="iso-8859-1")
  
imports: import io
  import json
  import time
  from typing import Dict, List, Union, Any
  import dateutil.parser
  from hailtop.fs.fs import FS
  from hailtop.fs.stat_result import FileType, FileListEntry, FileStatus
label_desc: Use image node_id 4 for calling the HadoopFS obj's underlying member method code with example usage: obj._open(path, mode, buffer_size, use_codec) and returns: handle, io