Python POP3邮件

# -*- coding: utf-8 -*-

import poplib
import email
from email.parser import Parser
from email.header import decode_header
from email.utils import parseaddr

'''
用Python的poplib模块收取邮件分两步：第一步是用POP3协议把邮件获取到本地，
第二步是用email模块把原始邮件解析为Message对象，然后，用适当的形式把邮件内容展示给用户即可。
'''

#猜测编码格式
def guess_charset(msg):
    charset = msg.get_charset()
    if charset is None:
        content_type = msg.get('Content-Type', '').lower()
        pos = content_type.find('charset=')
        if pos >= 0:
            charset = content_type[pos + 8:].strip()
    return charset
#解码
def decode_str(s):
    value, charset = decode_header(s)[0]
    if charset:
        value = value.decode(charset)
    return value
#解析邮件内容
def print_info(msg, indent=0):
    if indent == 0:
        for header in ['From', 'To', 'Subject']:
            value = msg.get(header, '')
            if value:
                if header=='Subject':
                    value = decode_str(value)
                else:
                    hdr, addr = parseaddr(value)
                    name = decode_str(hdr)
                    value = u'%s <%s>' % (name, addr)
            print('%s%s: %s' % ('  ' * indent, header, value))
    if (msg.is_multipart()):
        parts = msg.get_payload()
        for n, part in enumerate(parts):
            print('%spart %s' % ('  ' * indent, n))
            print('%s--------------------' % ('  ' * indent))
            print_info(part, indent + 1)
    else:
        content_type = msg.get_content_type()
        if content_type=='text/plain' or content_type=='text/html':
            content = msg.get_payload(decode=True)
            charset = guess_charset(msg)
            if charset:
                content = content.decode(charset)
            print('%sText: %s' % ('  ' * indent, content + '...'))
        else:
            print('%sAttachment: %s' % ('  ' * indent, content_type))

email = raw_input('Email: ')
password = raw_input('Password: ')
pop3_server = raw_input('POP3 server: ')
#加密
#server = poplib.POP3_SSL(pop3_server, port = 995)

server = poplib.POP3(pop3_server)
#server.set_debuglevel(1)
print(server.getwelcome())
# 认证:
server.user(email)
server.pass_(password)
print('Messages: %s. Size: %s' % server.stat())
resp, mails, octets = server.list()
# 获取最新一封邮件, 注意索引号从1开始:
resp, lines, octets = server.retr(len(mails))
# 解析邮件:
msg = Parser().parsestr('\r\n'.join(lines))
# 打印邮件内容:
print_info(msg)
# 慎重:将直接从服务器删除邮件:
# server.dele(len(mails))
# 关闭连接:
server.quit()

　　借鉴 https://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000/001408244819215430d726128bf4fa78afe2890bec57736000。