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Makes sense. I agree that publicly exposing the left/right attributes makes sense. But let's do it properly:
1. Add an example to the documentation
2. Add some tests to Lib/test/test_filecmp.py that verify these attributes behave as expected
In addition, I think it makes a lot of sense to add an optional "stream" argument to the report() and report_*() methods, to at leas allow reporting to some custom channel and not solely stdout. The report() method does a lot more than your simple example demonstrates, and it's not very easy to replace its functionality.
Would you like to submit a full patch for this?