code: def close(self):
          
          if self.closed:
              return
  
          if self.mode in "aw":
              self.fileobj.write(NUL * (BLOCKSIZE * 2))
              self.offset += (BLOCKSIZE * 2)
              # fill up the end with zero-blocks
              # (like option -b20 for tar does)
              blocks, remainder = divmod(self.offset, RECORDSIZE)
              if remainder > 0:
                  self.fileobj.write(NUL * (RECORDSIZE - remainder))
  
          if not self._extfileobj:
              self.fileobj.close()
          self.closed = True
docs: Close the TarFile. In write-mode, two finishing zero blocks are
             appended to the archive.