I once held a position as a systems programming for a big data science research institute at a large state University. RHEL 5.x comes with Python 2.4 by default

I once held a position as a systems programming for a big data science research institute at a large state University. RHEL 5.x comes with Python 2.4 by default. Our Platform compute clusters ran RHEL. We would build Python 2.7.x from source and use that rather than the older 2.4. However, we never used Python 3, nor needed it. No one cared about it. It was not a topic of conversation even. Python 2 got the job done and lot's of research code was written in it, and still is. I have nothing against Python 2 or 3. I'm just relaying my own experience. We used a lot of C++ and Java too. And the Java guys were fond of Groovy. I did mostly C++ and Python.