Let's write Python 3 right now!

When the best Python 2/Python 3 compatibility modules -- especially the
famous `*six* library invented by Benjamin Peterson
`_ -- were created, they were written
from the point of view of a Python 2 programmer starting to grok Python 3.

When thou writeth Python, thou shalt write Python 3 and, just for a while,
ensure that the thing worketh on Python 2.7 and, possibly, even 2.6.

Just before Python 2 is finally phased out, thine codebase shall look more
like 3 than like 2.

nine facilitates this new point of view. You can write code that is as
3ish as possible while still supporting 2.6. Very comfortable for writing
new projects.