data = '''\
MIME-Version: 1.0
Content-type: multipart/mixed; boundary="boundary"

This is a message with multiple parts in MIME format.
--boundary
X-Appcfg-File: static/foo%2Bbar
X-Appcfg-Hash: 864f52dc_bf5d1a45_15e2b611_29746d47_835e27e2
Content-Type: application/octet-stream
Content-Length: 6
Content-Transfer-Encoding: 8bit

echo\r

--boundary--
'''

import cStringIO as io
import email.parser

def main():
    fp = io.StringIO(data)
    parser = email.parser.Parser()
    message = parser.parse(fp)
    assert message.is_multipart()
    parts = message.get_payload()
    body_part_zero = parts[0].get_payload()
    assert body_part_zero == 'echo\r\n', repr(body_part_zero)  # FAIL

main()