code: def wake(self):
      try:
          self.writer.write(b"x")
      except IOError:
          pass
  
file_path: catboost/contrib/python/pyzmq/py2/zmq/eventloop/minitornado/platform/posix.py
imports: from __future__ import absolute_import, division, print_function, with_statement
  import fcntl
  import os
  from .None import interface
label_desc: Use image node_id 4 for calling the Waker obj's underlying member method code with example usage: obj.wake() without return types