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I ended up with a very similar looking patch - and so merged my changes into Pitrou's patch.
I also had a go at fixing up the `test_gdb` unit test, which revealed a few more string/unicode issues. Finally tracked them down to the `write_unicode` function. Sadly the `write` function in GDB's Python API only accepts unicode strings, hence we must pre-backslash escape for C-string encoding (either Python's default encoding or utf-8 in Python 3.1+) then turn it back into a unicode string again to avoid a TypeError. Yuck.
The patch almost applies on Python 2.7, but needs a little bit of massaging due to slight differences in Tools/gdb/libpython.py. Need to test the new unicode changes haven't broken anything and then I'll upload a patch for Python 2.7.