I am studying Google Compute Engine, this Infrastructure-as-a-Service (IaaS) permits you to run your large-scale computing workloads on Linux virtual machines hosted on Google’s infrastructure.
- First install the python_select package: sudo port install python_select
- Already now you can check which python distributions are available on you system. Just issue the command: port select –list python
- Print the python version which is set at the moment: port select –show python
- To switch to python 2.7 version: sudo port select –set python python27-apple
 MacPorts Project: http://www.macports.org
 IaaS: http://en.wikipedia.org/wiki/Infrastructure_as_a_service#Service_models