def is_response(self, other):
        """Is other a response to self?
        @rtype: bool"""
        if other.flags & dns.flags.QR == 0 or \
           self.id != other.id or \
           dns.opcode.from_flags(self.flags) != \
           dns.opcode.from_flags(other.flags):
            return False
        if dns.rcode.from_flags(other.flags, other.ednsflags) != \
               dns.rcode.NOERROR:
            return True
        if dns.opcode.is_update(self.flags):
            return True
        for n in self.question:
            if n not in other.question:
                return False
        for n in other.question:
            if n not in self.question:
                return False
        return True
Is other a response to self?
        @rtype: bool