How to understand if python is updated in Ubuntu or not?

Question

Python

Ubuntu 16.04.3 LTS
I write in the terminal python3 --version, the answer is 3.5.2
I try to install the new version with the following commands:

sudo add-apt-repository ppa:jonathonf/python-3.6
sudo apt-get update
sudo apt-get install python3.6
In response to the last command, it writes:
python3.6 is already the newest version (3.6.4-1+xenial2)

Answer 1

He writes to you, remove the previous packages, auto remove and install the latest version.