new_contents: import contextlib
  
  @contextlib.contextmanager
  def open_context_manager(filename, mode="r"):
      fh = open(filename, mode)
      yield fh
      fh.close()
  
  with open_context_manager("ContextWrapper.py") as fh:
      print(fh)
      print("test done")
  
  
  @contextlib.contextmanager
  def debug(name):
      print("Debugging {}".format(name))
      yield
      print("End")
  
  @debug("test")
  def test():
      print("Test method")
  
  test()
subject: Add context wrapper demo.