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As a note on the general pattern, a user at work diagnosed a ^C problem in their code when running on 2.7 to be due to Queue.get's
acquire()
try:
 ...
finally:
 release()
Pattern, with the KeyboardInterrupt triggering after acquire() but before the try is entered. so release() is never called.
A try finally pattern that probably alleviates this by entering the try block first might look like:
try:
 acquire()
 ...
finally:
 try:
 release()
 except ThreadError:
 pass # interrupted before acquire() succeeded.
It'd be a shame if any with statements lock acquisition context managers need to be turned into that, but I _believe_ it'd be a viable workaround for the time being if this race is found to be biting anyone.