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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: HeaderParseError
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Date: Mon, 04 Jul 2011 11:51:41 +0200
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Thomas Guettler wrote:

> I get a HeaderParseError during decode_header(), but Thunderbird can
> display the name.
> 
>>>> from email.header import decode_header
>>>> 
decode_header('=?iso-8859-1?B?QW5tZWxkdW5nIE5ldHphbnNjaGx1c3MgU_xkcmluZzNwLmpwZw==?=')
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib64/python2.6/email/header.py", line 101, in decode_header
>     raise HeaderParseError
> email.errors.HeaderParseError
> 
> 
> How can I parse this in Python?

Trying to decode as much as possible:

>>> s = "QW5tZWxkdW5nIE5ldHphbnNjaGx1c3MgU_xkcmluZzNwLmpwZw==?="
>>> for n in range(len(s), 0, -1):
...     try: t = s[:n].decode("base64")
...     except: pass
...     else: break
...
>>> n, t
(49, 'Anmeldung Netzanschluss S\x19\x1c\x9a[\x99\xcc\xdc\x0b\x9a\x9c\x19')
>>> print t.decode("iso-8859-1")
Anmeldung Netzanschluss S[ÌÜ

>>> s[n:]
'w==?='

The characters after "...Netzanschluss " look like garbage. What does 
Thunderbird display?