#!/usr/bin/env python

import boto
from os.path import exists
from sys import exit

s3_conn = boto.connect_s3()

key = s3_conn.get_all_buckets()[0].get_all_keys()[0]

if(exists(key.name)):
    print("The file named %s already exists." % (key.name))
    exit(0)

key.get_contents_to_filename(key.name)