>Python 3 has has become prevalent in usage around 2013-2014.
Citation needed. Back then it was at best at 20%, and even today it's not much more (source: PYPY download statistics breakdown).
>I don't know anyone who is starting a Python 2 project as of now.
I know several. Any company with lots of Python 2 projects that are not going anywhere soon (Google is one of them), is probably also starting new Python 2 projects alongside them, they won't add 2 different versions to cater to.
> Any company with lots of Python 2 projects that are not going anywhere soon (Google is one of them), is probably also starting new Python 2 projects alongside them, they won't add 2 different versions to cater to.
Citation needed.
Edit: Oh and Tensorflow for Windows is made by Google and it's Python 3.5 or higher.
[1] https://python3wos.appspot.com/
[2] https://www.tensorflow.org/install/install_windows
[3] https://docs.djangoproject.com/en/2.0/releases/2.0/