python 利用imap接收邮件，并保存附件

def SaveAttachImap():# login the imap server ,retrive the  new mails ,and download the attachments.

M = imaplib.IMAP4(mail_host,mail_port)
#print M

M.login(mail_user,mail_pass)

M.select('INBOX',False)
#result, message = M.select('INBOX',False)
typ, data = M.search(None, 'UNSEEN')
print data
for num in string.split(data[0]):
try:
typ, data = M.fetch(num, '(RFC822)')
#print data
msg = email.message_from_string(data[0][1])
for par in msg.walk():
#if not par.is_multipart():
name = par.get_filename()
print 'name',name

#name2 = par.get_filename()
#print 'name2',name2

if name:
dstdir =dirname+name
print 'dirname',dstdir
#print 'name',name
data = par.get_payload(decode=True)
#print dstdir
try:
f = open(dstdir, 'wb') #注意一定要用wb来打开文件，因为附件一般都是二进制文件
print 'save attfile %s succeed'%dstdir
except:
print 'open  file name error'
f.write(data)
f.close()

#print "_______________________________"
except Exception,e:
print 'got msg error: %s' % e

M.close()
M.logout()