print_tags.py

#!/usr/bin/env python

import boto3

config = {}

config['region'] = 'us-west-2'

rds = boto3.client('rds', region_name=config['region'])
ec2 = boto3.resource('ec2', region_name=config['region'])

def main():

    global rds, iam, ec2

    _identifiers = []
    _instances = []

    region = config['region']

    paginator = rds.get_paginator('describe_db_instances')
    for instances in paginator.paginate(PaginationConfig={"PageSize": 100}):
        for instance in instances['DBInstances']:
            security_group_id = instance['VpcSecurityGroups'][0]['VpcSecurityGroupId']
            account_id = ec2.SecurityGroup(security_group_id).owner_id

            identifier = instance['DBInstanceIdentifier']
            arn = "arn:aws:rds:%(region)s:%(account_id)s:db:%(identifier)s" % locals()
            tags = rds.list_tags_for_resource(ResourceName=arn)['TagList']

            print "Instance: %s, tags: %s" % ( identifier, tags )

if __name__ == "__main__":
    main()