code: def to_bytes(self):
          '''
          Return packed byte representation of the TCP header.
          '''
          header = self._make_header(self._checksum)
          return header + self._options.to_bytes(f to_bytes(self):
          '''
          Return packed byte representation of the TCP header.
          '''
          header = self._make_header(self._checksum)
          return header + self._options.to_bytes()
docs: Return packed byte representation of the TCP header.