There is an enormous body of Python 2.x code out there; much of which is likely never to be ported to Python 3 at all. But for those who wish to convert their code to Python 3—or to support both 2.x ...

The Python language, which is not new but continues to gain momentum and users as if it were, has changed remarkably little since it first was released. I don't mean to say that Python hasn't changed; ...