Switching between python versions in OSX

I just needed to test something with python 2.7 in my osx.
I used Mac ports in the following way:

Install python 2.7:

sudo port install python27

Install python_select:

sudo port install python_select

Check the available versions doing:

sudo python_select -l

In my case the output was:

$ sudo python_select -l
Available versions:
current none python26 python26-apple python27

Changed my python version doing:

sudo python_select python27

That's it!

$ python --version
Python 2.7.1