[nas]

Imagine you have a company that does something not related to software. You have some important business tools that are implemented in Python. What is your incentive to spent money and take the risk of new bugs porting to Python 3? It doesn't make business sense.

That's why there is still lots of COBOL in the world and why Python 2.x is going to live for many years, far past the 5 year predicted end of life. It will be far cheaper to make new releases of Python 2.x than to port the millions of lines of existing code.

Python 3 is nice, take a look at it. It probably will be easier porting than you think. However, don't feel like you are forced into moving to it. Python 2.x will continue to be around.