The Python project went absolutely above and beyond to support users who wanted to drag out making not particularly complex changes to their codebase for over a decade.

During this same time they improved Python 3 in response to feedback and among other effects, made it less different and easier to port, from Python 2.

Many common packages supported 2.7 up to its end-of-life as well.

One of the reasons that Python is often a source of compatibility errors is that both distros and large standalone applications embraced Python in the early 2000s, became dependent on a particular version, and then refused to work with newer versions.

Python is not responsible for all the engineering decisions everyone writing in the language has ever made.