Write an integer as an unsigned 16-bit value.

def write_short(self, n):
        """Write an integer as an unsigned 16-bit value."""
        if n < 0 or n > 65535:
            raise FrameSyntaxError(
                'Octet {0!r} out of range 0..65535'.format(n))
        self._flushbits()
        self.out.write(pack('>H', int(n)))