This test is useless in a code base that supports both python 2 and 3. Now, however, it is quite valuable.
Recent changes fix or suppress all such errors. Moreover, the suppressions are valuable documentation.
Another win for the changeover to python 3.
I've enabled this test in leo/test/pylint-leo-rc-ref.txt and in my personal file: ~/.leo/pylint-leo-rc.txt.
Edward