[lghh]

"Python 4?? People have not even migrated to Python 3 yet!"

[goatlover]

Or just be like the cool kids and skip a version. Python 5, or name it after the year. Python 2020 sounds exciting enough to make everyone want to upgrade.

[JonathonW]

Python 3 was codenamed "Python 3000" during design and development.

(It was always intended for the finished product to call itself Python 3.0, though.)