def choose_boundary():
    # follow IE and firefox
    nonce = "".join([str(random.randint(0, sys.maxint-1)) for i in 0,1,2])
    return "-"*27 + nonce

# This cut-n-pasted MimeWriter from standard library is here so can add
# to HTTP headers rather than message body when appropriate.  It also uses
# \r\n in place of \n.  This is a bit nasty.
Return a string usable as a multipart boundary.
dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/samples-and-tests/i-am-a-developer/mechanize/ClientForm.py/choose_boundary