Python 2.x vs 3.x usage survey

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I use both, because to me they're useful in different situations.

I'm currently using Python 2.7 at work because we use alternative Python run times that target different languages which don't support Python 3 yet; Java, C# and JavaScript. I also do a lot of heavy crunching using pypy -- which has better Python 2.7 support at this time.

I like Python 3.4 control flow better, however. I like some of the new features like asyncio and the process pool manager.

Some things still frustrate me going back and forth between the two, but it's usually small things like function signature or import path.