Python script to publish to SNS topic

publish.py

import json
import boto3
client = boto3.client('sns')

mesg = json.dumps({
    "default": "default",
    "body": "this is a test"
})

response = client.publish(
    TopicArn='arn:aws:sns:eu-west-1:123456789012:Topic',
    Message=mesg,
    MessageStructure='json',
    MessageAttributes={
        'color': {
            'DataType': 'String',
            'StringValue': 'blue',
        }
    }
)