I would not say it's half a rewrite.

all: Python 3 support
aptsources: Almost completely identical, just some small fixes.
apt: API rename, using tested compatibility functions derived from the ones 
used in python-debian.
apt.progress: Mostly rename, and a rewritten AcquireProgress (the complete old 
one is still provided for compat)
apt_inst: Additional code only

apt_pkg
------------
- API rename, using a single tp_getattro function which translates old 
attributes names to the new ones.
- Use classes instead of functions for creating objects
- Fix the memory deallocation of most objects (previously, the object we 
pointed to was not deleted)
- Some new classes, but they do not change anything in the old ones
- Use getset instead of tp_getattr; as this is more reliable and allows pydoc 
to work.
- Some stylistic changes

The changelog looks larger than the changes are in reality, because it
also lists stuff that was already backported into 0.7.13.4 and lists
some fixes for new functionality again; and because the changes are
often documented per-file.

Shipping the new API now makes it easier to merge patches; and gives
developers one python-apt API for Debian & Ubuntu instead of two. And
hey, if Debian can ship it, Ubuntu should do it as well.

Oh, and the earlier the merge is done; the more testing the code gets.
It should have been done earlier, but doko is not a very responsive
person on the Debian side, and I wanted to wait for Python 3 in Debian
sid first; and could not merge the sid and experimental branches until
doko finally managed to upload python3.1 to unstable. And mvo was also
very busy, we were planning to merge it before the freeze; but this
failed due to some (now fixed) issues.

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https://bugs.launchpad.net/bugs/531518
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