code: def unregister(self, fd):
      assert isinstance(fd, int)
  
      self._fds.remove(fd)
  
      for sel in self._selectors:
          sel.unregister(fd)
  
imports: from __future__ import unicode_literals, absolute_import
  import sys
  import abc
  import errno
  import select
  import six
label_desc: Use image node_id 3 for calling the AutoSelector obj's underlying member method code with example usage: obj.unregister(fd) without return types