#!/usr/bin/env bash

list_all() {
    local http_endpoint="https://www.python.org/ftp/python/"
    local extract_regexp='s|.*\?<a .*\?>\([0-9].*\?\)/</a>.*\?|\1|p'

    curl -s $http_endpoint | sed -ne "$extract_regexp" | tr '\n' ' '
}

list_all