For any non-trivial project, most of the value of Python is the library ecosystem. So most of the 'carrots' are going to be libraries that are only available on

For any non-trivial project, most of the value of Python is the library ecosystem. So most of the 'carrots' are going to be libraries that are only available on Python 3. Like some future version of numpy, or pandas, or Django. It's not a stick. You can keep using the old version if you prefer. There will just be some nice new features for people on Python 3.