The following failure messages gets dumped out of
BitTorrent 3.4.2 when run against Python 2.4:

Traceback (most recent call last):
  File "/usr/local/lib/python2.4/threading.py", line
442, in __bootstrap
    self.run()
  File "/usr/local/lib/python2.4/threading.py", line
422, in run
    self.__target(*self.__args, **self.__kwargs)
  File
"/home/andrewl/python/lib/python2.4/site-packages/BitTorrent/Rerequester.py",
line 84, in rerequest
    h = urlopen(url)
  File "/usr/local/lib/python2.4/urllib2.py", line 130,
in urlopen
    return _opener.open(url, data)
  File "/usr/local/lib/python2.4/urllib2.py", line 364,
in open
    response = meth(req, response)
  File "/usr/local/lib/python2.4/urllib2.py", line 468,
in http_response
    code, msg, hdrs = response.code, response.msg,
response.info()
AttributeError: addinfourldecompress instance has no
attribute 'code'

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Does this happen if the exact same files are run in 2.3?  I can't find 
addinfourldecompress in Python; is it a BitTorrent class?

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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.

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This is indeed http://python.org/sf/852995 again (the yum
package manager bug).  I don't think this is a Python bug,
though it's possible a patch could insulate users from this
change (even though the change was not to a public API).

My detailed comments on the corresponding yum bug are here:

https://bugzilla.redhat.com/beta/show_bug.cgi?id=138535#c44

Unless it's very new, addinfourldecompress is from
BitTorrent, not Python.

The Red Hat bug URL is now
https://bugzilla.redhat.com/show_bug.cgi?id=138535 ; it has a lengthy
discussion.

From that bug's history, the problem now seems to be fixed, though I'm
not sure if it was fixed on the Python or the yum/BitTorrent side. 
Closing this bug, anyway.