So I'm back to my idea of monkeypatching the standard libraries to add logging to a file wherever it resorts to the default encoding or an implicit decode, and

So I'm back to my idea of monkeypatching the standard libraries to add logging to a file wherever it resorts to the default encoding or an implicit decode, and one by one fix them until the log file stops having stuff in it. After a couple of months of not seeing any you just assume you found them all, and you can safely bet that you'll find the last couple in a couple more months, but by then you have managed to move to Python3 a few months ago.