def promote_read_replica(DBInstanceIdentifier=None, BackupRetentionPeriod=
    None, PreferredBackupWindow=None):
    """
    Promotes a Read Replica DB instance to a standalone DB instance.
    See also: AWS API Documentation
    
    Examples
    This example promotes the specified read replica and sets its backup retention period and preferred backup window.
    Expected Output:
    
    :example: response = client.promote_read_replica(
        DBInstanceIdentifier='string',
        BackupRetentionPeriod=123,
        PreferredBackupWindow='string'
    )
    
    
    :type DBInstanceIdentifier: string
    :param DBInstanceIdentifier: [REQUIRED]
            The DB instance identifier. This value is stored as a lowercase string.
            Constraints:
            Must be the identifier for an existing Read Replica DB instance
            Must contain from 1 to 63 alphanumeric characters or hyphens
            First character must be a letter
            Cannot end with a hyphen or contain two consecutive hyphens
            Example: mydbinstance
            

    :type BackupRetentionPeriod: integer
    :param BackupRetentionPeriod: The number of days to retain automated backups. Setting this parameter to a positive number enables backups. Setting this parameter to 0 disables automated backups.
            Default: 1
            Constraints:
            Must be a value from 0 to 8
            

    :type PreferredBackupWindow: string
    :param PreferredBackupWindow: The daily time range during which automated backups are created if automated backups are enabled, using the BackupRetentionPeriod parameter.
            Default: A 30-minute window selected at random from an 8-hour block of time per region. To see the time blocks available, see Adjusting the Preferred Maintenance Window in the Amazon RDS User Guide.
            Constraints:
            Must be in the format hh24:mi-hh24:mi .
            Times should be in Universal Coordinated Time (UTC).
            Must not conflict with the preferred maintenance window.
            Must be at least 30 minutes.
            

    :rtype: dict
    :return: {
        'DBInstance': {
            'DBInstanceIdentifier': 'string',
            'DBInstanceClass': 'string',
            'Engine': 'string',
            'DBInstanceStatus': 'string',
            'MasterUsername': 'string',
            'DBName': 'string',
            'Endpoint': {
                'Address': 'string',
                'Port': 123,
                'HostedZoneId': 'string'
            },
            'AllocatedStorage': 123,
            'InstanceCreateTime': datetime(2015, 1, 1),
            'PreferredBackupWindow': 'string',
            'BackupRetentionPeriod': 123,
            'DBSecurityGroups': [
                {
                    'DBSecurityGroupName': 'string',
                    'Status': 'string'
                },
            ],
            'VpcSecurityGroups': [
                {
                    'VpcSecurityGroupId': 'string',
                    'Status': 'string'
                },
            ],
            'DBParameterGroups': [
                {
                    'DBParameterGroupName': 'string',
                    'ParameterApplyStatus': 'string'
                },
            ],
            'AvailabilityZone': 'string',
            'DBSubnetGroup': {
                'DBSubnetGroupName': 'string',
                'DBSubnetGroupDescription': 'string',
                'VpcId': 'string',
                'SubnetGroupStatus': 'string',
                'Subnets': [
                    {
                        'SubnetIdentifier': 'string',
                        'SubnetAvailabilityZone': {
                            'Name': 'string'
                        },
                        'SubnetStatus': 'string'
                    },
                ],
                'DBSubnetGroupArn': 'string'
            },
            'PreferredMaintenanceWindow': 'string',
            'PendingModifiedValues': {
                'DBInstanceClass': 'string',
                'AllocatedStorage': 123,
                'MasterUserPassword': 'string',
                'Port': 123,
                'BackupRetentionPeriod': 123,
                'MultiAZ': True|False,
                'EngineVersion': 'string',
                'LicenseModel': 'string',
                'Iops': 123,
                'DBInstanceIdentifier': 'string',
                'StorageType': 'string',
                'CACertificateIdentifier': 'string',
                'DBSubnetGroupName': 'string'
            },
            'LatestRestorableTime': datetime(2015, 1, 1),
            'MultiAZ': True|False,
            'EngineVersion': 'string',
            'AutoMinorVersionUpgrade': True|False,
            'ReadReplicaSourceDBInstanceIdentifier': 'string',
            'ReadReplicaDBInstanceIdentifiers': [
                'string',
            ],
            'ReadReplicaDBClusterIdentifiers': [
                'string',
            ],
            'LicenseModel': 'string',
            'Iops': 123,
            'OptionGroupMemberships': [
                {
                    'OptionGroupName': 'string',
                    'Status': 'string'
                },
            ],
            'CharacterSetName': 'string',
            'SecondaryAvailabilityZone': 'string',
            'PubliclyAccessible': True|False,
            'StatusInfos': [
                {
                    'StatusType': 'string',
                    'Normal': True|False,
                    'Status': 'string',
                    'Message': 'string'
                },
            ],
            'StorageType': 'string',
            'TdeCredentialArn': 'string',
            'DbInstancePort': 123,
            'DBClusterIdentifier': 'string',
            'StorageEncrypted': True|False,
            'KmsKeyId': 'string',
            'DbiResourceId': 'string',
            'CACertificateIdentifier': 'string',
            'DomainMemberships': [
                {
                    'Domain': 'string',
                    'Status': 'string',
                    'FQDN': 'string',
                    'IAMRoleName': 'string'
                },
            ],
            'CopyTagsToSnapshot': True|False,
            'MonitoringInterval': 123,
            'EnhancedMonitoringResourceArn': 'string',
            'MonitoringRoleArn': 'string',
            'PromotionTier': 123,
            'DBInstanceArn': 'string',
            'Timezone': 'string',
            'IAMDatabaseAuthenticationEnabled': True|False
        }
    }
    
    
    :returns: 
    CreateDBInstance
    DeleteDBInstance
    ModifyDBInstance
    
    """
    pass
