ISO 8859-1 filename not decoding

Question

I\'m extracting files from MIME messages in a python milter and am running across issues with files named as such:

=?ISO-8859-1?Q?Certificado=5FZonificaci=F3n=5F2010

Answer 1

Your string is encoded using the Quoted-printable format for MIME headers. The email.header module handles this for you:

>>> from email.header import decode_header
>>> try:
...     string_type = unicode  # Python 2
... except NameError:
...     string_type = str      # Python 3
...
>>> for part in decode_header('=?ISO-8859-1?Q?Certificado=5FZonificaci=F3n=5F2010=2Epdf?='):
...     decoded = string_type(*part)
...     print(decoded)
...
Certificado_Zonificación_2010.pdf