how to install python on linux ubuntu 18.04 code example

Example 1: ubuntu install python

# first do:
sudo apt-get update
# after do:
sudo apt-get install python3.6
# then it should be installed

Example 2: install python3.7 ubuntu 20.04

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.7

Example 3: how to install python 3.9 on ubuntu 18.04

Install the dependencies files to build Python. ...
Download the latest Python stable source code. ...
Extract the Python 3.9. ...
Run the configure script. ...
Build the Python 3.9.1. ...
Install the Python 3.9.1. ...
Verify the Python 3.9