Installing Python on Mac OS X The latest version of Mac OS X, El Capitan, comes with Python 2.7 out of the box. You do not need to install or configure anything else to use Python. Having said that, I would strongly recommend that you install the tools and libraries described in the next section before you start building Python applications for real-world use.
Installing / Updating Python on OS X While Python comes pre-installed on OS X, Apple doesn’t do a good job on keeping the Python runtime environment up to date. Currently, on Mac OS X 10.7.4 “Lion”, entering python -V returns Python 2.7.1. Even worse, Mac OS X 10.6 “Snow Leopard” is still on a Python 2.6 release. While the latest Python releases are always available on updating a Mac isn’t a simple, straight forward process. Follow along and update your Mac to Python 2.7.3, or 3.3.0 or whatever the newest 2.x and 3.x release might be, when you read this. To update your Mac to something like Python 2.7.3, I assume that TreeLine The MacPorts Project