Install Python 2.x and 3.x

install_pythons.sh

#!/bin/bash

### Python
# Setup python from source, for multiple versions of it. This only works with whole version numbers, not alpha releases.
# CentOS requires these packages:
#	sudo yum -y install gcc automake autoconf
#	sudo yum -y install readline-devel ncurses-devel openssl-devel sqlite-devel tk-devel gdbm-devel bzip2-devel
# Ubuntu requires:
#	sudo apt-get install libreadline-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev

# Some people will prefer this to be /usr/local or /var/local, or whatever.
PREFIX=/opt

cd /tmp
for VERSION in 2.7.9 2.7.10 3.4.3
do
	wget https://www.python.org/ftp/python/$VERSION/Python-$VERSION.tgz
	tar zxvf Python-$VERSION.tgz
	cd Python-$VERSION
	./configure --with-signal-module --with-threads --prefix=${PREFIX}/python-$VERSION
	make -j 8 && \
	sudo make install && \
	if [ ${VERSION:0:1} = "2" ]; then
		curl https://bootstrap.pypa.io/get-pip.py | sudo ${PREFIX}/python-$VERSION/bin/python
		# (Optional)
		sudo ${PREFIX}/python-$VERSION/bin/pip install supervisor
	fi
	sudo ${PREFIX}/python-$VERSION/bin/pip${VERSION:0:1} install virtualenv
done

# Verify it installed correctly by listing out pip for each version
ls -l ${PREFIX}/python-*/bin/{pip,virtualenv}*