class_docstr: Given as a parameter to the inputhook.
docstr: Clean up resources.
code: def close(self):
      """
      Clean up resources.
      """
      if self._r:
          os.close(self._r)
          os.close(self._w)
  
      self._r = self._w = None
  
file_path: catboost/contrib/python/prompt-toolkit/py2/prompt_toolkit/eventloop/inputhook.py
imports: from __future__ import unicode_literals
  import os
  import threading
  from prompt_toolkit.utils import is_windows
  from .select import select_fds
label_desc: Use image node_id 5 for calling the InputHookContext obj's underlying member method code with example usage: obj.close() without return types