PYTHON

install python 3.8

# for docker
apt install software-properties-common
add-apt-repository ppa:deadsnakes/ppa
apt install python3.8

download python 3.8

# the answer is given by Merwanski for linux:

sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.8

python3.8 --version

# you could also simply go to: https://www.python.org/downloads/ and find your preferred version. 
# install it for your OS. 

python 3.7.9 download

# download it from here
	https://www.python.org/downloads/release/python-379/

python 3.7 download

# https://www.python.org/downloads/release/python-370/
# change the last 3 digits in the link to determine version 
# (e.g: '370' -> 3.7.0 && if you want 3.7.5 version just change them to '375')