$ python
>>> from boto.s3.connection import S3Connection
>>> conn = S3Connection('<aws access key>', '<aws secret key>')
>>> conn.get_bucket('wozozo')
<Bucket: wozozo>
>>> from boto.s3.key import Key
>>> k = Key(b)
>>> k.key = 'path/to/resource'
>>> fout = open('filename', 'w')
>>> k.get_file(fout)
簡単すぎる。