How to force Sphinx to use Python 3.x interpreter

Question

I try to create documentation for a project written with Python 3.x. Sphinx is the tool I want to use and, according to the official site, its last version 1.1.2 is

Answer 1

When I searched for an answer, this is the site that came up over and over. I'm thinking the answer is not easy to find because everyone else understands sphinx better than I can figure out. But if any is still searching for an answer, this is what eventually I ended up with:

sudo apt-get update

sudo apt-get install python3

sudo apt-get install sqlite3

sudo apt-get install idle3

sudo apt-get install python3-pip

sudo apt-get install python3-docutils

sudo apt-get install python3-jinja2

sudo apt-get install python3-pygments

sudo pip3 install Sphinx

The key was I was missing the fact that there was a pip3. I also update the system before adding a package as habit.