code: def authorize(self, cidr_ip=None, ec2_group=None):
          
          if isinstance(ec2_group, SecurityGroup):
              group_name = ec2_group.name
              group_owner_id = ec2_group.owner_id
          else:
              group_name = None
              group_owner_id = None
          return self.connection.authorize_dbsecurity_group(self.name,
                                                            cidr_ip,
                                                            group_name,
                                                            group_owner_id)
docs: Add a new rule to this DBSecurity group.
          You need to pass in either a CIDR block to authorize or
          and EC2 SecurityGroup.
  
          @type cidr_ip: string
          @param cidr_ip: A valid CIDR IP range to authorize
  
          @type ec2_group: :class:`boto.ec2.securitygroup.SecurityGroup>`
  
          @rtype: bool
          @return: True if successful.