Disassociate an Elastic IP address from a currently running instance.

        :type public_ip: string
        :param public_ip: The public IP address for EC2 elastic IPs.

        :type association_id: string
        :param association_id: The association ID for a VPC based elastic ip.

        :rtype: bool
        :return: True if successful

def disassociate_address(self, public_ip=None, association_id=None):
        """
        Disassociate an Elastic IP address from a currently running instance.

        :type public_ip: string
        :param public_ip: The public IP address for EC2 elastic IPs.

        :type association_id: string
        :param association_id: The association ID for a VPC based elastic ip.

        :rtype: bool
        :return: True if successful
        """
        params = {}

        if public_ip is not None:
            params['PublicIp'] = public_ip
        elif association_id is not None:
            params['AssociationId'] = association_id

        return self.get_status('DisassociateAddress', params, verb='POST')