Using the six library is one way to make a large project being written from the ground up run in both Python2 and Python3. For this particular project, I would

Using the six library is one way to make a large project being written from the ground up run in both Python2 and Python3. For this particular project, I would had needed to get the code to run in both Python3 and an ancient version of Python2 made back when boost.python was still a thing, so six would be out of the question.