Comment 3 for bug 752220

Note that lock.py has other problems, as reported by pyflakes. E.g. line 151 and 152 have references to 'lock' which should probably be alt_lock, though I'm not positive about that. And line 176 has a reference to TransactionCancelled() which is also undefined. The logging one is shallow though so I'll try to fix that now and file bugs for the other problems.