Example Python for get S3 Bucket Size

getS3BucketSize.py

#!/usr/bin/env python

# This is how I used to write Python scripts. I'm trying to improve:
# https://github.com/joehack3r/aws/blob/master/scripts/s3/getS3BucketSize.py

import argparse
import boto

# Arguments
parser = argparse.ArgumentParser(description='Calcualte S3 bucket size in GB')
parser.add_argument('--buckets', action='store', nargs='+', metavar='<S3 Bucket Name>', dest='s3Buckets', help='S3 buckets to calculate size')
args = parser.parse_args()

for bucket in args.s3Buckets:

  s3bucket = boto.s3.connection.S3Connection().get_bucket(bucket)
  size = 0

  for key in s3bucket.list():
    size += key.size

  print "%s:%d B:%.1f KiB:%.1f MiB:%.1f GiB" % (bucket, size, size*1.0/1024, size*1.0/1024/1024, size*1.0/1024/1024/1024)