在lis中查找内容的问题

Question

我有一个程序，可以从我的电子邮件中检索信息（通过POP），我想检索电子邮件的主题，我使用这个：

import poplib
from email import parser
pop_srvr = poplib.POP3_SSL('pop.gmail.com')
pop_srvr.user('username')
pop_srvr.pass_('password')
messages = [pop_srvr.retr(i) for i in range(1, len(pop_srvr.list()[1]) + 1)]
messages = [b"\n".join(mssg[1]) for mssg in messages]
messages = [parser.Parser().parsestr(mssg) for mssg in messages]
for message in messages:
  print (message['subject'])
  print (message['body'])
pop_srvr.quit()

但当我运行它时，我得到了这个

Traceback (most recent call last):
File "C:/Users/Yousef/Desktop/parser proto.py", line 11, in <module>
messages = [parser.Parser().parsestr(mssg) for mssg in messages]
File "C:/Users/Yousef/Desktop/parser proto.py", line 11, in <listcomp>
messages = [parser.Parser().parsestr(mssg) for mssg in messages]
File "C:\Users\Yousef\AppData\Local\Programs\Python\Python36-
32\lib\email\parser.py", line 68, in parsestr
return self.parse(StringIO(text), headersonly=headersonly)
TypeError: initial_value must be str or None, not bytes

有人告诉我我做错了什么。。。你知道吗

Answer 1

It seems linke  poplib.POP3_SSL module returns bytes object.

You probably need to change following :


    ["\n".join(mssg[1]) for mssg in messages]

 to

    [b"\n".join(mssg[1]) for mssg in messages]

我发现email模块有message_from_bytes函数。你试过用它吗？我可能被误解在下面的代码。请在您身边核实：

import email

messages = [pop_srvr.retr(i) for i in range(1, len(pop_srvr.list()[1]) + 1)]
messages = [b"\n".join(mssg[1]) for mssg in messages]
messages = [email.message_from_bytes(mssg) for mssg in messages]
for message in messages:
  print (message['subject'])
  print (message['body'])
pop_srvr.quit()

更多信息：parsing email contents from poplib with email module (PYTHON)

Answer 2

你试过把它串起来吗？你知道吗

messages = [parser.Parser().parsestr(str(mssg)) for mssg in messages]

它可能会导致一个不正确的字符串，但通过这种方式，您可以检查mssg是否真的是一个类似于的字节。如果错误消失了，你可以用一种适合你的程序的方式来转换它。你知道吗