@nitinkhanna The transition to Python 3 has been intentionally slow, but the tide has turned. Even LTS distros will be dropping Py2 in their base system over the next few years, and the last ones with Py2 in base will lose vendor support in the mid-2020s. Py2 will go to security fix only mode in 2020. And Py3.5 and up have added some awesome new features.
Way more here: http://python-notes.curiousefficiency.org/en/latest/python3/questionsandanswers.html