Python - Update the redrive policy for existing queues

updateredrivesqs.py

import boto3
import json

# update these with your actual settings
maxreceivecount = 3
queueurl = "https://sqs.region.amazonaws.com/accountnumber/queuename"
deadlettertargetarn = "arn:aws:sqs:region:accountnumber:deadletterqueuename"

# you could just create a json string
policy = {"maxReceiveCount" : maxreceivecount, "deadLetterTargetArn": deadlettertargetarn}
policy = json.dumps(policy)

sqs_client = boto3.client('sqs')
response = sqs_client.set_queue_attributes(QueueUrl=queueurl, Attributes={"RedrivePolicy" : policy})