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The same BitTorrent version works just fine under 2.3.5.

addinfourldecompress is a BitTorrent object which inherits
from Python's addinfourl in urllib.py.

The following comment was found in a patch that attempted to
work around the issue:

# As of Python 2.4 http_open response also has 'code' and 'msg'
# members, and HTTPErrorProcessor breaks if they don't exist.

This problem has been cited in a couple of different
contexts.  I saw it in a bug report for bittornado on
FreeBSD.  I also saw it in a RedHat list concerning breakage
in the yum utility.

Annoyingly, nobody seems to have filed it upstream with the
Python folks.