The friction is that people don't like changing thngs that work, and a lot of Python 3 is backported from future People migrate when the allure of Python 3 out

The friction is that people don't like changing thngs that work, and a lot of Python 3 is backported from future People migrate when the allure of Python 3 outweighs the hassle of juggling 2 versions. Naturally, people who grew up on Python 2 are more hesitant than people who started later on Python 3.