Often one does not need 10 reasons, 1 is enough if it's critical enough. For my case the missing libs in py3 world are * boto (AWS interface) * pika (RabbitM

Often one does not need 10 reasons, 1 is enough if it's critical enough. For my case the missing libs in py3 world are * boto (AWS interface) * pika (RabbitMQ interface) Yes, supervisor too, but it can run in a separate Python 2 env. It's also about fear that next package that we need to progress faster might not support py3. But confidence builds over time and the list of Python 3 packages will only improve over time. It will converge to one single Python 3, there is absolutely no doubt.