CentOS7 - Install Python 2.7 and 3.6 from source

pythonInstall.sh

#!/bin/bash 

# Python 2.7 and 2.6 install script for CentOS 7 
# Instructions mainly taken from tutorial by Daniel Eriksson
# https://danieleriksson.net/2017/02/08/how-to-install-latest-python-on-centos/ 

python27_version=2.7.15
python36_version=3.6.6
build_dir=python_build_temp
example_environment_dir=pythonEnv

echo "Install prerequisites"
sudo yum groupinstall -y "Development Tools"
sudo yum install -y zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel expat-devel

echo "Create temp directory to build python"
mkdir $build_dir
cd $build_dir

echo "Download Python 2.7"
wget http://python.org/ftp/python/$python27_version\/Python-$python27_version\.tar.xz
tar xf Python-$python27_version\.tar.xz
cd Python-$python27_version
./configure --prefix=/usr/local --enable-unicode=ucs4 --enable-shared LDFLAGS="-Wl,-rpath /usr/local/lib"
echo "Build and install Python 2.7"
make && sudo make altinstall

cd .. 

echo "Download Python 3.6"
wget http://python.org/ftp/python/$python36_version\/Python-$python36_version\.tar.xz
tar xf Python-$python36_version\.tar.xz
cd Python-$python36_version
./configure --prefix=/usr/local --enable-shared LDFLAGS="-Wl,-rpath /usr/local/lib"
echo "Build and install python 3.6"
make && sudo make altinstall

cd ..

wget https://bootstrap.pypa.io/get-pip.py
echo "Install pip for Python 2.7"
sudo /usr/local/bin/python2.7 get-pip.py
echo "Install pip for Python 3.6"
sudo /usr/local/bin/python3.6 get-pip.py

echo "Install virtualenv for Python 2.7"
sudo /usr/local/bin/pip2.7 install virtualenv
# Note: Python 3.3+ has the ability to create virtual environments built in so virtualenv is not required

echo "Clean up installation files"
cd ..
sudo rm -rf $build_dir

echo "Create example environment for Python 2.7 and 3.6"
mkdir $example_environment_dir
cd $example_environment_dir
# Using full paths to be certian that the correct binaries are used
/usr/local/bin/virtualenv -p /usr/local/bin/python2.7 py2.7env
/usr/local/bin/python3.6 -m venv py3.6env

echo "For Python 2.7 use: source py2.7env/bin/activate"
echo "Once active use: pip install numpy matplotlib"
echo "To deactivate type: deactivate"

echo "For Python 3.6 use: source py3.6env/bin/activate"
echo "Once active use: pip install numpy matplotlib"
echo "To deactivate type: deactivate"

echo "Install complete!"

Use at your own risk
All thanks should go to Daniel Eriksson
All errors are my own.