get bucket size cloudwatch.py

import boto3
from datetime import datetime, timedelta

regions = [
    "ap-northeast-1", "ap-northeast-2", "ap-south-1", "ap-southeast-1",
    "eu-central-1", "eu-west-1", "eu-west-2", "us-east-1", "us-east-2",
    "us-west-1", "us-west-2"
]

for region in regions:
    bucket_name = "EXAMPLEBUCKET"

    cloudwatch = boto3.client('cloudwatch', region_name=region)
    response = cloudwatch.get_metric_statistics(
        Namespace="AWS/S3",
        MetricName="BucketSizeBytes",
        Dimensions=[{
            "Name": "BucketName",
            "Value": bucket_name
        }, {
            "Name": "StorageType",
            "Value": "StandardStorage"
        }],
        StartTime=datetime.now() - timedelta(days=1),
        EndTime=datetime.now(),
        Period=86400,
        Statistics=['Average'])

    bucket_size_bytes = response['Datapoints'][-1]['Average']
    print(bucket_name + " " + str(bucket_size_bytes))