I&#x27;ve been dragging my heels on this for a long time, but I&#x27;m finally starting to take the plunge into 3.<p>I think for any greenfield project, there&#x27;s very little reason to use CPython 2 anymore. If you want performance, use PyPy. If you want features, use CPython 3. From now on, that&#x27;s the philosophy I&#x27;m following whenever I write something new.