Around 2015 is when lots of people found all their dependencies were compatible with Python 3 or abandoned and replaced. How much work they had to do depended o

Around 2015 is when lots of people found all their dependencies were compatible with Python 3 or abandoned and replaced. How much work they had to do depended on if they put any effort into compatibility for the last 7 years. Or even just followed recommendations for Python 2. Writing 100% compatible code wasn't practical in 2008 but distinguishing bytes from text was.