something.py

import json
import time
import boto3

s3 = boto3.resource('s3')
sqs = boto3.resource('sqs')
queue = sqs.get_queue_by_name(QueueName="S3Example")

while True:
    for message in queue.receive_messages(
        WaitTimeSeconds=10,
        VisibilityTimeout=60,
        MaxNumberOfMessages=10
    ):
        records = json.loads(message.body).get('Records', [])
        for record in records:
            s3.meta.client.download_file(
                record['s3']['bucket']['name'],
                record['s3']['object']['key'],
                "/tmp/"+record['s3']['object']['key']
            )
        message.delete()
    time.sleep(1)