Part of it is that Python 3 does not offer any really strong reasons to switch to it, in an existing code base. It is definitely better and rounds out a bunch o

Part of it is that Python 3 does not offer any really strong reasons to switch to it, in an existing code base. It is definitely better and rounds out a bunch of small problems and inconsistencies that exist in Python 2. It also does have some cool new features. However, since Python 3 is not compatible with Python 2 (there is very good tooling for automatic converting and supporting both in one code base) many developers have not taken the time to port their code.