code: def close(self):
          
          if self.fp is None:
              return
  
          try:
              if self.mode in ('w', 'x', 'a') and self._didModify:  # write ending records
                  with self._lock:
                      if self._seekable:
                          self.fp.seek(self.start_dir)
                      self._write_end_record()
          finally:
              fp = self.fp
              self.fp = None
              self._fpclose(fp)
docs: Close the file, and for mode 'w', 'x' and 'a' write the ending
          records.