def get_next_mail(pop_url, pop_port, get_email, get_passwd):

    mail = poplib.POP3_SSL(pop_url, pop_port)
    mail.user(get_email)
    mail.pass_(get_passwd)

    if len(mail.list()[1]) > 0:

        tmp = ''.join(mail.retr(1)[1])
        # 'mail.dele(1)' seems to be ignored by gmail, configure in mail setting
        # as delete on POP access instead
        mail.dele(1)
        mail.quit()
        return tmp

    else:
        return ''


def get_attachment(pop_url, pop_port, get_email, get_passwd):

    email_str = get_next_mail(pop_url, pop_port, get_email, get_passwd)
    msg = email.message_from_string(email_str)
    print msg.walk()
    print msg.is_multipart()
    print msg.get_payload()


I get the following when executed ...

dave@main-system:~/kindle_daemon$ ./kd.py
<generator object walk at 0x9c3961c>
False

dave@main-system:~/kindle_daemon$


get_attachment(pop_url, pop_port, get_email, get_passwd)