SourceLair's default Python version currently is 2.7.6. One of the most popular requests from our users in the support channel is a way to change the Python version to 3+.
We have now documented a fast and easy way to change your Python version. With a single and simple command you can switch the Python version back and forth between 2.7.6 and 3.4.3. The command also takes care of switching between your pip from pip2 to pip3 and vise versa. Just be sure to restart your terminal and your server for the change to take place. Also, if you've already installed any packages, after changing your Python version make sure to reinstall them.
You can find the documentation and commands for the version switching at http://help.sourcelair.com/runtime/python-version.