Get total bytes in a bucket

bucket_du.py

# Iterates over all the keys in a bucket and totals the bytes used
# NOTE: if you have a lot of keys, this could take a LONG time.

import boto

def bucket_du(bucket_name):
    s3 = boto.connect_s3()
    bucket = s3.lookup(bucket_name)    
    total_bytes = 0
    for key in bucket:
        total_bytes += key.size
    return total_bytes