how to update the python in ubuntu code example
Example 1: update python ubuntu
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install python3.7
Example 2: change python 3.5 to 3.6 ubuntu
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2
sudo update-alternatives --config python3