code: def add_securitygroup_rule(self, group_id, remote_ip=None,
                                 remote_group=None, direction=None,
                                 ethertype=None, port_max=None,
                                 port_min=None, protocol=None):
          
          rule = {'direction': direction}
          if ethertype is not None:
              rule['ethertype'] = ethertype
          if port_max is not None:
              rule['portRangeMax'] = port_max
          if port_min is not None:
              rule['portRangeMin'] = port_min
          if protocol is not None:
              rule['protocol'] = protocol
          if remote_ip is not None:
              rule['remoteIp'] = remote_ip
          if remote_group is not None:
              rule['remoteGroupId'] = remote_group
          return self.add_securitygroup_rules(group_id, [rule])
docs: Add a rule to a security group
  
          :param int group_id: The ID of the security group to add this rule to
          :param str remote_ip: The remote IP or CIDR to enforce the rule on
          :param int remote_group: The remote security group ID to enforce
                                   the rule on
          :param str direction: The direction to enforce (egress or ingress)
          :param str ethertype: The ethertype to enforce (IPv4 or IPv6)
          :param int port_max: The upper port bound to enforce
                               (icmp code if the protocol is icmp)
          :param int port_min: The lower port bound to enforce
                               (icmp type if the protocol is icmp)
          :param str protocol: The protocol to enforce (icmp, udp, tcp)