[mikebenfield]

> They added Python 3 features to Python 2 over the years to encourage adoption of Python 3 as the standard. It worked.

Did it really? My impression was the opposite: the fact that so much of Python 3 became available in Python 2 made people feel like there was no point in moving to Python 3.

[viraptor]

It worked both ways. Some new features were ported back, some could be ported, but explicitly weren't to encourage migration. On the other side, things like the "u" prefix got re-added to python 3 for compatibility.