code: def __del__(self):
      self.downstream.close()
      self.upstream.close()
      if self.root:
          self.pub.close()
      else:
          self.sub.close()
      self._ctx.term()
  
imports: import re
  import socket
  from functools import reduce
  import zmq
  from ipyparallel.serialize import deserialize_object, serialize_object
  from ipyparallel.util import disambiguate_url
label_desc: Use image node_id 2 for calling the BinaryTreeCommunicator obj's underlying member method code with example usage: obj.__del__() without return types