[Python] setup Python environment in Mac OSX

• Environment setup
• install Python (via MacPorts)

sudo port install python

• version selection (e.g version: 3.6 or 2.7)
• check installed version by

port installed | grep python

sudo port select --set python python36 (or python27)

Success message: "Selecting 'python36' for 'python' succeeded. 'python36' is now active."

• install pip & select version (python package manager)

sudo port install py36-pip (or py27-pip)
port select --set pip pip36

• Reference
• installing and setting PIP with MacPorts
• macports installation