[eeZi]

Nah. I'm a long-time Python developer (10 years+) and I moved everything over to Python 3 because there are so many advantages. This includes a number of massive internal code bases that I maintain at my day job. Porting is surprisingly easy nowadays, it used to hurt a lot more.

Management is fine with development time spent on migrating to Python 3, since it's an investment in the future (Python 2 will be EOL in 2020!).

[BuckRogers]

Sounds like you're a lone wolf at a smaller company. Different ballgame from the "longtime Python devs" that I'm talking about. I had an employer with a 500KLOC Python2 codebase, a billion dollar business on the line, and new features to deliver. That 2020 date is just a big political stunt. As was 2015 or it wouldn't have been a snap of the fingers to extend it. Code won't stop working in 2020 and security is largely handled by a webserver.

I use Python3 sometimes as well, but doesn't mean what I'm saying isn't true.