Tried go and fairly quickly headed back to Python. Kept running into annoyances that slowed development. Not being able to get a NULL back from a database without a third-party library was the final straw (go 1.5, might have changed since then).

I understand there's obvious use cases for Go, but an amazing amount of what we do is taking data from place 'A' (web, socket, file), sending it to place 'B' (another web, socket, file), and then returning a result. Go doesn't buy you much that asyncio won't.