code: def close(self):
          
          if self.file:
              self.file.close()
              self.file = None
  
          # If temp_file is a folder, we do not remove it because we may
          # still need it after the unpickler is disposed
          if self.tmp_file and _os.path.isfile(self.tmp_file):
              _os.remove(self.tmp_file)
              self.tmp_file = None
docs: Clean up files that were created.