Download, build and install all python 3.x versions

install.sh

#!/bin/bash

# Verify we have wget and build tools
apt-get update && apt-get install -y wget gcc make

# add or remove python versions; full index @ https://www.python.org/ftp/python/
cd /tmp &&\
wget https://www.python.org/ftp/python/3.5.10/Python-3.5.10.tgz &&\
wget https://www.python.org/ftp/python/3.6.9/Python-3.6.9.tgz &&\
wget https://www.python.org/ftp/python/3.7.9/Python-3.7.9.tgz &&\
wget https://www.python.org/ftp/python/3.8.9/Python-3.8.9.tgz

# extract zips & cleanup
while read p; do
  cd /tmp && tar -zxf $p && rm -rf $p
done <<< `ls | grep Python-3.`

# build and install
while read p; do
    cd ./$p && ./configure && make && make install
done <<< `ls | grep Python-3.`