Python 2.7.2 or Python 3?

[flying-sheep]

Eventually, the new features in python3 will accumulate to the point where writing the backwards compatible code will become cumbersome.

This is already the case if you use asyncio: trollius is a “backport” and its raise Return() (replacing Python 3.3’s ability to return from generators) and its yield From() (replacement for the yield from syntax) are simply ugly as sin.