用python下载邮件附件

import poplib
import cStringIO
import email
import email.Header
import base64,osos.chdir('d:\\python')
#POP3取信
M = poplib.POP3('xxx.xxx.xxx)
M.user('xxxxxx')
M.pass_('xxxxxx')#打印有多少封信
numMessages = len(M.list()[1])
print 'num of messages', numMessages
for i in range(numMessages):
m = M.retr(i+1)

buf = cStringIO.StringIO()
for j in m[1]:
print >>buf, j
buf.seek(0)#解析信件内容
msg = email.message_from_file(buf)
for part in msg.walk():
contenttype = part.get('Content-Disposition')
filename=email.Header.decode_header(part.get_filename())
if filename and contenttype and contenttype[0:10]== 'attachment':
filename=os.path.basename(filename[0][0])
print contenttype[0:10],filename
f = open(filename,'wb')
f.write(part.get_payload(decode=True))
f.close()
M.quit()
print 'exit'