Comment 11 for bug 1651660

OK so this is what I did to resolve the problem (I hope) Crude but it appears to work.

1/ go to /usr/lib/pytho2.7 and rename weakref.py to weakref-org.py
2/ copy weakref.py from /usr/lib/python3.5 to usr/lib python2.7
3/ sudo apt-get -f install and edit until it runs
4/ rename the weakref-org.py back to weakref.py

I've attached my edited version if you trust me. If you don't there were no great tricks, comment out a couple of bits that were causing grief and replace unsupported syntax with the corresponding lines from the original weakref.py

Hope that's fixed it until the next update and this is the end of the problem.

Cheers
Kim