How can I change the default Python version on Max OSX using macport?

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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.

1. First install the python_select package: sudo port install python_select
2. Already now you can check which python distributions are available on you system. Just issue the command: port select –list python
3. Print the python version which is set at the moment: port select –show python
4. To switch to python 2.7 version: sudo port select –set python python27-apple

[1] MacPorts Project: http://www.macports.org
[2] IaaS: http://en.wikipedia.org/wiki/Infrastructure_as_a_service#Service_models