[chrisdl]

I actually don't "know" either. But I suspect it has to do with knowing which python to use (system generally) and if the user wants to use global packages as well.

checkout virtualenvwrapper (http://virtualenvwrapper.readthedocs.org/en/latest/install.h...) as well for handling virtualenvs.

[obviouslygreen]

+1, I definitely should have mentioned this. virtualenvwrapper makes it vastly more convenient.

[dangoldin]

Author here - thanks for mentioning this! I've never used it but will give it a go.