That was just the surface. Even the Python Foundation knew that their 2to3 converter tool just wasn't sufficient and hat to delay the discontinuation of Python

That was just the surface. Even the Python Foundation knew that their 2to3 converter tool just wasn't sufficient and hat to delay the discontinuation of Python 2 for half a decade, because there was so much unportable code out there. In the end we had 12 years where the two languages lived side by side and my first job using Python had us use 2.7 for new projects due to library concerns despite 3 being around for more than 7 years already.