code: def unclosed(method):
      """
      Decorator to check if the object is closed.
      """
  
      @wraps(method)
      def unclosed_wrapper(self, *args, **kwargs):
          if self.closed:
              raise ValueError("Operation on a closed object")
          return method(self, *args, **kwargs)
  
      return unclosed_wrapper
  
file_path: whoosh/src/whoosh/util/__init__.py
imports: from __future__ import with_statement
  import random, sys, time
  from bisect import insort
  from functools import wraps
  from whoosh.compat import xrange
label_desc: Use image node_id 7 for calling a global function with example usage: unclosed(method) and returns: unclosed_wrapper, method