def get_secret():
secret_name = "abc"
region_name = "xyz"

session = boto3.session.Session()
client = session.client(
    service_name='secretsmanager',
    region_name=region_name
)
try:
    get_secret_value_response = client.get_secret_value(
        SecretId=secret_name
    )

except ClientError as e:
    print(e)
else:
    if 'SecretString' in get_secret_value_response:
        secret = get_secret_value_response['SecretString']
        #Print Credentials
        print(secret)

{"username":"xxxxx","password":"yyyyyyy","engine":"mysql","host":"only master host here","port":zzzz,"dbClusterIdentifier":"aaaaaaaaa"}