In addition, if you're developing a web-based system you can write your code in preparation for Python 3. When you're ready to move over, you do a one-time port

In addition, if you're developing a web-based system you can write your code in preparation for Python 3. When you're ready to move over, you do a one-time port and drop Python 2.x support altogether. Obviously this depends on a few things - deployment, time/cost etc.