python pop3 收邮件

def retrive_emails(pop3_server, user_name, passwd, server_port):
    #POP3
    pop_client = poplib.POP3(pop3_server, port=server_port)
    pop_client.user(user_name)
    pop_client.pass_(passwd)
   
    #print messages num
    num_messages, mbox_size = pop_client.stat()
    print 'there are %s new emails\n' % num_messages
    if num_messages == 0:
        pop_client.quit()
        return
    print('num of messages %s' %str(num_messages))
   
    #mk folder
    folder_name = '%s-%s' %(user_name, pop3_server)
    if not os.path.exists(folder_name):
        os.mkdir(folder_name)
       
    for idx in range(num_messages):         
        one_mail = pop_client.retr(idx+1)
        buf = cStringIO.StringIO()
        for j in one_mail[1]:           
            print >>buf,j 
        buf.seek(0)
       
        #parse mail content
        msg = email.message_from_file(buf)
        for part in msg.walk():
            contenttype = part.get_content_type()
            print('\npart:\n%s\n' % part)
      &