That's what Python2.7 is and why every major proprietary product won't adopt anything else. It's also why it won't go away.

All of my Python 2.6-2.7 scripts haven't been touched in 10 years in production and they aren't likely to ever be updated. I actually now refuse to write new Python that isn't compatible with both 2&3 for this reason. Python3 refuses to stabilize.