S3 using IAM roles for EC2

get_asset_from_s3.py

#!/usr/bin/env python

from boto import connect_s3
import argparse

parser = argparse.ArgumentParser(description="Read file names and S3 bucket path")
parser.add_argument('bucket_name', type=str, help='Name of the S3 bucket to connect to.')
parser.add_argument('file_path', type=str, help='path to a file on S3')
args = parser.parse_args()

s3 = connect_s3()
bucket = s3.get_bucket(args.bucket_name)
key = bucket.get_key(args.file_path)
key.get_contents_to_filename(key.name)