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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.